Bicycles

The PreWheelz 12 balance bike is the big brother (or sister) to the PreWheelz 10 model. Designed to build the same confidence and riding fundamentals as the 10, the PreWheelz 12 comes with a slightly larger frame/fork and 12" wheels for those fast growing 3 to 5 year old toddlers. Performance and versatility continue on the 12 with the quick adjust seat height, tubeless EVA tires on 12" mags and real ball bearing headset and wheels. - 6061 alloy crank-less "Balance Bike" frame design with foot rests - High impact mag wheels - Scuff-resistant tubeless tires - Adjustable handlebar height - Ball bearing headset - Oversized padded seat with rider-assist grab handle - Quick release height adjust seat post

The Cape May supplies a smooth, relaxed ride for fully enjoying summer or year-round fun for riders along the coast. This iconic beach bike comes equipped with anti-rust paint treatments and flat-resistant tires. - Fuji A1 Alloy Frame - Hi-Ten Steel Fork - Kenda 26 x 2.10" tires - Rear Coaster Brake

The Cape May supplies a smooth, relaxed ride for fully enjoying summer or year-round fun for riders along the coast. This iconic beach bike comes equipped with anti-rust paint treatments and flat-resistant tires. - Fuji A1 Alloy Frame - Hi-Ten Steel Fork - Kenda 26 x 2.10" tires - Rear Coaster Brake - A low-step frame features a lower top tube, making starting and stopping a breeze

NOTHING BEATS THE FEELING OF YOUR FIRST PEDAL BIKE. THIS TWO-WHEELER COMES WITH REMOVABLE TRAINING WHEELS AND MAKES IT EASY FOR KIDS TO FALL IN LOVE WITH CYCLING. KEY PERFORMANCE FACTORS Built for kids Short crank length and narrow Q-factor make Animator easy to pedal, and a lightweight aluminum frame allows small children to have more control. Kid-friendly features Short-reach brake levers, lower stand-over height, protective stem pad and removable training wheels make it fun and safe for kids learning to ride a pedal bike. Durable ALUXX aluminum frame material provides long-lasting reliability, backed by a lifetime warranty on the frame. All new, in the box, and covered by the full manufacturer's warranty. Some assembly is required, and we recommend a professional bike shop build for the best results. See: https://www.archersbikes.com/faq/bicycle-assembly-faqs-pg308.htm

- Special edition Keith Haring x Affinity collection - Birch plywood white washed frame with quality mag wheels, rubber tires with tubes, and adjustable seat height - Features original Keith Haring artwork with screen printed colorful graphics - Helps develop balance, coordination, and motor skills for a smoother transition to pedaled bikes - Comes with all over print XL tote bag

They’re growing up, so they need a more grown-up bike. Dart was designed to help kickstart their transition from kids’ bike to adult bike – it features the same 7-speed drivetrain & shifters found on some of our adult bikes, and a kid-sized V-brake packs the same stopping power as the grown-up hand brakes they’ll be learning how to use. They’ll get familiar with switching gears while being able to expand their bike route to include more varied terrain, and the bike’s ergonomic design was tailor-made to support the perfect riding position for smaller cyclists (even while they continue growing!) and have them feeling comfortable and confident on two wheels as they maneuver the neighborhood streets with ease. Get to know their bike: - 6-8 Years Recommended Age Range - 21.5"-28" Adjustable Seat Height - 20x2.10” Wide, Shock-Absorbing Tires - Shimano 7-Speed - Revoshift Twist-Grip Shifter - Easy-Reach V-Brake Perfect Fit A better fitting bike leads to faster learning, heightened confidence, & more fun. At under 26 lbs, this bike is lightweight and easier for kids to maneuver, and its easy-mount frame & ergonomic saddle were tailor-made just for them. Grows With Them This bike’s wide range of adjustable seat height, extending from just 21.5” up to 28”, can accommodate small riders and their growth spurts, so little cyclists can keep riding comfortably as their bike grows with them. Shimano 7-Speed Big-kid bike or grown-up bike? With a full set of gears to add power and speed to their ride, they won’t be able to tell the difference. Easy-Reach V-Brakes This bike features highly responsive, easy-reach V-brakes that teach little ones how to use hand brakes like those found on adult bikes. Easily adjust the brake lever’s reach to fit smaller hands. Shimano Revoshift Shifters A safer ride at their fingertips – literally. Kids can safely change gears with palms on the handlebars and eyes on the road. Threadless Steering System Stronger, lighter, more precise steering, and easier to maintain.

The perfect match to get you out of the neighborhood and into the skatepark. All new, in the box, and covered by the full manufacturer's warranty. Some assembly is required, and we recommend a professional bike shop build for the best results. See: https://www.archersbikes.com/faq/bicycle-assembly-faqs-pg308.htm

Specifications Frameset Frame High-tensile steel hand-built, Low-Profile step-over frame design Headtube 115mm frame headtube Fork Unicrown high-tensile steel, 25.4mm threadless Wheelset Rims Retrospec aluminum double-wall 36H Hubs Steel, ball-bearing, 36H, bolt-on, F/100-R/135mm, 3/8" (10mm) Spokes 14G UCP Tires Retrospec 24 x 1.95, S/V valves, 50psi Accessories Kickstand Steel, center-mount Drivetrain Derailleur - Rear Shimano Tourney 7S Shifters Shimano Revoshift (twist) 7S, RS35 Crank Steel 1-piece 162mm x 36T Chain KMC C65 1/2 x 3/32" BB Loose-ball retainer, 24tpi, #66 Freewheel/Cog Shimano Tourney 500, 7S 14-28T Components Headset Steel, ball-bearing, 1 1/8" threadedless Brakes V-BrakeS front and rear, aluminum w/2-finger aluminum/plastic, reach-adjustable brake levers Handlebars Steel riser, 580mm width x 30mm rise, 25.4 center Grips Soft TPR (95mm (3.75") length, large safety end - PVC/BPA/Lead/Phthalate safe Stem Threadless, steel/aluminum, 1" handlebar clamp dia.(25.4mm), 1 1/8" stem clamp dia.(28.6mm), 80mm ext., 2-bolt alum faceplate Saddle Retrospec for Kids 24", padded Seatpost Steel, 1" (25.4mm) Seatpost Clamp Aluminum aluminum (1 1/8"/28.6mm OD) Pedals High-impact nylon, 1/2" w/CPSC reflectors, black

Starting early is the key to teaching your young ones the joys of bicycle life, and there's no better way to do so than with our Hotwalk. It's for kids 18 months to 4 years old*, and it's designed for fewer crashes and more smiles to make learning to ride a bike as easy as can be. - Adult assembly is required. Tools are included in the box. - Tough A1 Premium Aluminum frame has a low standover that's made to fit all sizes of little kids. - The 12-inch alloy wheels are not only light but durable enough to take plenty of abuse. - The Rhythm Lite Airless tires will never go flat, allowing your little ripper to scoot around on- and off-road worry-free.

Dart is a comfortable, advanced bike for kids that bridges the gap by introducing them to features commonly seen on adult bikes. A versatile 7-speed drivetrain teaches them how to use gears to optimize their ride, and twist-grip shifters allow them to practice switching gears with their hands on the handlebars and eyes on the road. The easy-reach V-brake is made for small hands, but brings big stopping power, and gets them used to braking with their hands instead of their feet. Taking children’s unique proportions into account, this bike is tailor-made just for them – its ergonomic design with adjustable height supports a comfortable riding position as they keep growing, its size and weight allow even smaller cyclists to handle the bike with ease, and cushy, shock-absorbing tires will keep the cruising smooth ride after ride. They’ll be leading the pack in no time. Get to know their bike: - 8-11 Years Recommended Age Range - 23.5"-29" Adjustable Seat Height - 24x2.10" Wide, Shock-Absorbing Tires - Shimano 7-Speed - Revoshift Twist-Grip Shifter - Easy-Reach V-Brake Perfect Fit A better fitting bike leads to faster learning, heightened confidence, & more fun. At 28.25 lbs, this bike is lightweight and easier for kids to maneuver, and its easy-mount frame & ergonomic saddle were tailor-made just for them. Grows With Them This bike’s wide range of adjustable seat height, extending from just 23.5” up to 29”, can accommodate small riders and their growth spurts, so little cyclists can keep riding comfortably as their bike grows with them. Shimano 7-Speed Big-kid bike or grown-up bike? With a full set of gears to add power and speed to their ride, they won’t be able to tell the difference. Easy-Reach V-Brakes This bike features highly responsive, easy-reach V-brakes that teach little ones how to use hand brakes like those found on adult bikes. Easily adjust the brake lever’s reach to fit smaller hands. Shimano Revoshift Shifters A safer ride at their fingertips – literally. Kids can safely change gears with palms on the handlebars and eyes on the road. Threadless Steering System Stronger, lighter, more precise steering, and easier to maintain.

They’re tired of “kid stuff,” and they’re ready for a new adventure. Sesh offers uncompromised professional quality and deliberate design choices tailored for the next generation of shredders. Built with a durable steel frame and reinforced with thick dropouts, Sesh has the same resilience your grom brings to every ride. At its core, this entry-level BMX bike packs a punch with professional-grade features, including a 3-piece crank, 25x9T compact gearing, and axle pegs – just like their favorite pro’s bike. Thoughtful safety features like extra-long handlebars, a reliable & snag-free U brake, precise threadless steering, and wide, shock-absorbing tires keep their ride safe and nervous parents at ease. Sesh is edgy, exciting, and undeniably bad@$$. It's not just what kids want; it's what they'd choose for themselves.

KHS Bicycles Inc. was founded in 1974 as an American-based company distributing the KHS brand of bicycles. Its mission is to design, manufacture, and distribute moderately priced, high-quality bicycles and accessories. Since then, KHS has grown into a brand respected for quality, value, and integrity, distributed in more than 30 countries worldwide. KHS Bicycles Inc. manufactures full lines of mountain, road, and touring bicycles, as well as comfort tandems and cruisers. In addition, it markets BMX, freestyle, and dirt-jumping bicycles to the juvenile and youth markets under the brand name Free Agent. The Vitamin B is a great all-around fitness bike. It is suitable for paved and gravel roads. The 700X32c tires provide great durability and traction in various road conditions. Commuters, casual riders, and even serious fitness buffs will appreciate the light, sturdy frame. All new, in the box, and covered by the full manufacturer's warranty. Some assembly is required, and we recommend a professional bike shop build for the best results. See: https://www.archersbikes.com/faq/bicycle-assembly-faqs-pg308.htm

These are the bikes that started it all—now, they're our best-sellers! Speed, style, and simplicity make these bikes the perfect storm of awesome whether you're starting out, getting back into biking after a few years away, or just want to get a feel for riding fixed! - 43cm will come with a rear brake, 650c wheels, and 650x23C tires. Fixed Gear or Freewheel? We chose a flip-flop rear hub to give you the flexibility to ride fixed or freewheel. Riding fixed gives you an unmatched feeling of connectedness to the bike, the road, and helps you perfect your pedal-stroke. Riding freewheel gives you the ability to coast and cruise, just like the single-speed you grew up on! No matter which you choose to ride, the standard front brake guarantees you can stop either way.

Crafted with an aluminum frame for the perfect blend of durability and lightness, this cruiser invites you to experience the essence of summer all year long. Whether you prefer a leisurely single-speed journey or crave the versatility of a 7-speed option, the Tuesday August Series delivers a ride that captures the joy of cruising.

Built with an aluminum frame for the perfect blend of durability and lightness, this cruiser invites you to experience the essence of summer all year long. Whether you prefer a leisurely single-speed journey or crave the versatility of a 7-speed option, the Tuesday August Series delivers a ride that captures the joy of cruising.

Classic double diamond frame equipped with Shimano 7-speed gearing, Quick-release front hub for easy wheel removal, and a comfort saddle to help smooth out the bumps. Your dream ride if... You're a city rider looking for a simple and stylish seven-speeder. You'd consider yourself a minimalist and want something low maintenance but love the choices that come with a broad gear range. It's all in the details... Kinney sports a reliable Shimano Tourney 7-speed derailleur to tackle bumps, inclines and road imperfections along your route. Paired with Shimano Revoshift twist shifters, you can make quick and easy gear changes to accommodate the terrain ahead. Cruise rain or shine on all-season tires and ride assured that a sealed cartridge bottom bracket is protecting delicate bike parts from the elements. Stop on a dime with reactive brakes at every unexpected traffic stop. The cherry on top... Constructed with a minimal amount of mostly aluminum parts, this bike is lighter weight to maneuver through the city like a champ. An upright riding position, ergonomic bike seat, and riser handlebars make for a comfortable commute. No frills, just simple, sleek looks and trusty parts.

From parkways to paths, paved roads or dirt, this versatile flat-bar bike can help you reach new fitness goals or add some spice to your daily commute. KEY PERFORMANCE FACTORS All-terrain versatility With a mountain bike style flat handlebar, suspension fork and disc brakes, you can ride road or dirt with confidence. Lightweight and durable Frameset constructed with high-quality ALUXX aluminum. Comfort and stability Frame geometry puts the rider in a position that balances efficiency with stability on rough roads, paths or trails. Wheel size: Sizes XX-Small – X-Small: 26-inch Sizes Small – X-Large: 27.5-inch

From parkways to paths, paved roads or dirt, this versatile flat-bar bike can help you reach new fitness goals or add some spice to your daily commute. KEY PERFORMANCE FACTORS All-terrain versatility With a mountain bike style flat handlebar, suspension fork and disc brakes, you can ride road or dirt with confidence. Lightweight and durable Frameset constructed with high-quality ALUXX aluminum. Comfort and stability Frame geometry puts the rider in a position that balances efficiency with stability on rough roads, paths or trails.

Top quality build. This fixie, single-speed, campus or urban road bike has it all, at an affordable price. High-Tensile Steel Frame 700x32C Commuter Tires 40mm Double-Wall Rims Internal Cable Routing Threadless Steering System

New Sun Atlas Industrial Bike The Atlas is a work horse made to withstand the demands of light industrial use or enjoying a day at the beach. This cruiser has the stamina for whatever your day can throw at it. You'll find the Atlas outfitted with a mix of rugged components, an extra comfy saddle and grips that won't disappoint. Classic high-tensile steel frame Single-speed drivetrain Shimano coaster brake One-piece steel crank with sealed bottom bracket and KMC RustBuster Chain Alloy rims with heavy duty 12g stainless steel spokes 26" x 2.125" cruiser tires Steel cruiser handlebar with rubber grips Sun double coil spring cruiser saddle Steel chain guard and fenders Heavy duty steel kickstand

With our Riprock Coaster 16, riding gets boiled down to its simplest element—fun. And to make sure of it, we designed the bike with tons of cool features that are easy for your little ones to use, like a coaster brake for simple stopping, wide 16x2.3" tires that increase stability and confidence, and tough components that will stand up to years of abuse. It's the perfect bike for your little ripper to start getting out on the trail with—we just wish that we had one when we were kids. - The A1 premium aluminum frame is lightweight and built to withstand the tough use by kids, while the geometry features an ultra-low standover that makes it easy for your little ones to fit on and grow with the bike. - Steel coaster brake is a reliable, easy to use brake perfect for safe stops and awesome skids. - 16x2.3" Rhythm Lite tires deliver tons of traction, comfort, stability, and fun over all types of terrain.

This bike’s steel frame is tough, resistant to fatigue, and shock-absorbing, yet light enough to handle comfortably – perfect for city riding. Shimano 7-speed drivetrain is versatile and can handle varying inclines with ease. Grooved commuter tires grip the pavement and dispel water for a smooth ride and solid traction, rain or shine. Swept back handlebars offer a relaxed hand and wrist position, and a cushioned saddle makes for a more comfortable ride. Shimano Revoshift shifters let you easily change gears with palms on the handlebars and eyes on the road. All new, in the box, and covered by the full manufacturer's warranty. Some assembly is required, and we recommend a professional bike shop build for the best results. See: https://www.archersbikes.com/faq/bicycle-assembly-faqs-pg308.htm

Haro's Flightline One ST is ready to tackle whatever adventures your neighborhood has to offer. At its core is a lightweight, step-through aluminum frame that rides like a dream. It also sports a suspension fork with enough travel to take the edge off bumpy terrain. You’ll always find the right gear with the easy-shifting 21-speed Shimano drivetrain, while the linear-pull brakes offer top-notch stopping power for maximum control and fun.

For a day at the beach or just cruising around town, the Sun Retro is your new best friend. A refresh on our classic cruiser design, the Retro stays true to the spirit of simplicity while adding modern design cues and our refined geometry for the perfect ride. - Classic Steel Frame & Fork: Designed for durability and timeless style - Perfect for smaller riders, this frame is offered in Step-Thru and Step-Over designs for added versatility and comfort - Relaxed Upright Geometry: Ensures a comfortable riding posture for leisurely rides - Mid-Rise Cruiser Handlebars: Allows for an easy, upright grip to reduce strain on wrists and shoulders - Comfortable Cruiser Saddle: Plush padding and springs for maximum comfort - Wide, Balloon-Style Tires: Provide a smooth and cushioned ride on pavement, boardwalks - Lightweight Alloy Rims: Rust-resistant and durable - Single-Speed Simplicity: Ideal for flat terrain, offering low-maintenance riding - Wide Pedals with Grip: Ensures a secure footing for smooth pedaling - Coaster Brake: Simple and reliable stopping power without cables or levers - Steel Chain Guard: Protects clothing from the chain - Alloy Kickstand: Sturdy and lightweight for convenient parking Weight: - Bike Weight: 31 Lbs. - Rider Weight Limit: 250 Lbs.

FREE SHIPPING The perfect recreational mountain bike for new riders to dip their toes into trail riding, a commuting solution, or just an all-around fun bike for the city or country. An all-new frame with updated geometry for 2021, the Nevada ensures comfort and reliability, while rear fender and carrier mounts plus a kickstand mount make this a true do-it-all machine. - A2 aluminum frame featuring updated geometry to meet today's standards - SR Suntour front suspension fork with 100mm of travel - Shimano Tourney 3x7 speed drivetrain - Tektro HD-M280 mechanical disc brakes with 160mm rotors - WTB SX19 wheelset with WTB Ranger Comp 27.5 x 2.25" tires All new, in the box, and covered by the full manufacturer's warranty. Some assembly is required, and we recommend a professional bike shop build for the best results. See: https://www.archersbikes.com/faq/bicycle-assembly-faqs-pg308.htm

FREE SHIPPING The perfect recreational mountain bike for new riders to dip their toes into trail riding, a commuting solution, or just an all-around fun bike for the city or country. An all-new frame with updated geometry for 2021, the Nevada ensures comfort and reliability, while rear fender and carrier mounts plus a kickstand mount make this a true do-it-all machine. - A2 aluminum frame featuring updated geometry to meet today's standards - SR Suntour front suspension fork with 100mm of travel - Shimano Tourney 3x7-speed drivetrain - Tektro M260 mechanical disc brakes with 160mm rotors - WTB SX19 wheelset with WTB Ranger Comp 29 x 2.25" tires All new, in the box, and covered by the full manufacturer's warranty. Some assembly is required, and we recommend a professional bike shop build for the best results. See: https://www.archersbikes.com/faq/bicycle-assembly-faqs-pg308.htm

With its lightweight ALUXX aluminum frame, upright positioning and high-quality parts that give it a smooth, comfortable ride, the Escape Disc is totally versatile and totally fun to ride. It now features a high-quality composite fork and innovative D-Fuse seatpost. Both are great for smoothing out rough roads, absorbing shocks and vibrations, and giving you a smoother, more comfortable ride. The disc brakes deliver powerful braking performance in dry or wet conditions, and the 700c wheels with Giant EasyRide Tubeless tires (on select models) keep you rolling with speed, efficiency and a reduced risk of flats. As an added bonus, there’s clearance for larger tires up to 45mm in width, which makes it easier to ride rougher roads. It comes with integrated mounts, so you can customize your ride with racks or fenders. Whatever road or path you choose, Escape Disc is ready to roll. KEY PERFORMANCE FACTORS Balanced and efficient Lightweight ALUXX frame, fast-rolling 700c wheels, and confident upright positioning offer a balanced, efficient ride quality. Versatile and capable Powerful disc brakes and a wide range of gears help you increase your speed and tackle hills with more control. Rugged reliability Puncture-resistant tires feature the Giant EasyRide Tubeless system (on select models). Integrated rack mounts make it easier to carry your daily essentials or load up for weekend adventures.

PUSH THE PACE ON CLIMBS, LET LOOSE ON THE DESCENTS. THIS ALUMINUM HARDTAIL GIVES YOU A FEEL FOR THE TRAIL WITH BALANCED, CONFIDENT HANDLING AND A PLUSH SUSPENSION FORK. KEY PERFORMANCE FACTORS Proven alloy performance ALUXX aluminum frameset is hand-built in-house by the world leader in aluminum engineering. Balance and stability Frame geometry is designed to optimize the balance and roll-over capabilities of 29-inch wheels or the liveliness of 27.5-inch wheels (depending on frame size). XC control Suspension fork offers either 80mm or 100mm of smooth travel for added XC control. Wheel size: Sizes X-Small – Medium: 27.5-inch Sizes Small – X-Large: 29-inch

Lighter than a mountain bike, more comfy that a road bike... it's a bird, it's a plane, it's... da duhhn... the Bridgeport. Coming to a nicer bike shop near you, "The Bridgeport" (Rated R, starts Friday) has the can-do attitude of a suspension-fork-equipped mountain bike, the svelte poise of a sprightly road bike, the unflappable countenance of a LA-Z-Boy, all in a price-conscious package that's the MUST HAVE of this summer! Shop now for limitless mobile comfort or forever regret purchasing indecision. Features FRAMESET Frame 6061-T6 aluminum | Rider-tuned geometry | 68mm BSA BB shell | Flat mount Fork Suntour SF20 NEX HLO-DS | 63mm travel |Hydraulic Lockout | Post-mount Frame Shock N/A Colors Matte Black, Cherry Cola DRIVETRAIN Cranks Prowheel TB-CY01 | 46/30T | 8-speed | 170 / 175mm Pedals VP | 990S | Nylon body with steel cages | Chromoly axles Chain KMC Z8.1 | 8-speed Bottom Bracket Feimin FP-902W | Threaded BSA 68mm BB shell | 123mm spindle | Sealed cartridge Front Derailleur Microshift FD-T202 | Top swing | 34.9mm band diameter Rear Derailleur Microshift RD-M36L Derailleur Shifter Microshift TS39-2 & FD-T202 | 2 x 8-speed Freewheel/Cassette Mid-range | CS-M5008 8-Speed 11-34T | ED Black WHEELS Tires Kenda Kwick Bitumen | 700 x 38c Wheels/Rims Haro 700c | 19mm inner width | 28h | Alloy double wall | Disc-brake specifc Hubs KT-68 alloy 28H | Cassette rear hub | Front & rear quick release BRAKING SYSTEM Brakes Tektro MD-M280 | Mechanical disc | IS 6-bolt rotors | F: 180mm, R: 160mm Brake Levers Alloy 3-finger OTHER COMPONENTS Grips/Tape Haro | Dual-density durometer | Active tuned Handlebar Haro Alloy | 25mm rise | 31.8mm x 640 / 660mm | 9° backsweep Stem Haro Alloy | 7° rise | 70mm / 90mm / 100mm Headset Haro 1-1/8" threadless Internal | For 50mm OD headtube Saddle Haro | Dual-sport tuned padding | Weather-resistant cover Seat Post Haro Alloy | Micro-Adjust | 27.2mm x 350mm | single Bolt Seat Clamp Haro Aluminum 31.8mm Quick release Extras Rack and fender mounts

FRAMESET Frame Flightline X6 Series aluminum frame Fork HL 410E 1-1/8" threadless suspension fork w/ 30mm travel Colors Ink blue, Matte Green DRIVETRAIN Cranks Aluminum 3-pc 28T crankset w/ double chainguard Pedals MTB nylon body 9/16" Chain KMC Z7 GYBR, 1/2?x3/32?x90L, 7-Spd Bottom Bracket Cartridge Bearing 68mmX119mm Front Derailleur N/A Rear Derailleur Shimano RD-TY200, Tourney 7spd Derailleur Shifter Shimano SL-RV200 7-SPD Revo Shifter W window Freewheel/Cassette Shimano freewheel 14-34T WHEELS Tires Chao Yang H-5129 20"x2.0" Wheels/Rims Aluminum single wall 20" rims Front Hub Steel 32H 3/8" Rear Hub Steel 32H 3/8" BRAKING SYSTEM Brakes Promax TX-121 V-Brakes Brake Levers Promax BL-81G | Short reach OTHER COMPONENTS Grips/Tape Krayton rubber MTB Handlebar Alloy riser, 620mmW, 9° back sweep, 25mm rise, ø31.8 Stem 1-1/8" threadless 3D Forged Alloy 45mmL, 7° rise Headset 1-1/8" Threadless Saddle Haro Flightline Jr Seat Post Alloy micro adjust ø27.2 Seat Clamp Alloy ø 31.8 quick release