Ajax Open

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  • Regular price $1,699.00

"Such a good bike for the money." – Steve M.

Ajax Open

The Urban Ninja

Shhhh. What was that? Ajax moves through the city with stealth and speed, an urban ninja in matte black. Wired magazine bestowed Ajax with their "Gear of the Year" award and called it their “favorite urban velocipede we tested this year;” lofty praise from the oracles of innovation.

At the heart of this bike’s performance is its new-school drivetrain: an eight-speed Alfine internal hub and super-smooth belt drive that slices through the city like a shinobi in the night.

A favorite of tech-heads and entrepreneurs from Palo Alto to Brooklyn, Ajax delivers across the metrics that matter: performance, engineering, and — with many of the same high-end features as our Acme — it's also a great value. (We know that even urban ninjas need to complete their missions on a budget.) And like all of our street bikes, Ajax has hard mounts for racks, fenders, and a kickstand.

Technical Information

Gates CenterTrack

Next-generation Carbon Drive System. Unique, super-strong, carbon-reinforced polyurethane system that requires no lube and provides a nearly silent ride. CenterTrack is stronger, lighter, more compact, and better at shedding debris than the prior Gates systems.

Shimano Alfine 8-Speed Internally Geared Hub

Super-high quality with simple shifting and low maintenance providing a 307% gear range.

Spot Custom 7005 Aluminum

Proprietary, shaped, butted and tapered frame tubes designed for optimum strength, comfort, and durability. Lightweight aluminum tubing with precise tubing configurations for each frame size, results in a smooth and stable ride. Advanced performance styling of seat stays, top tube and down tube, in conjunction with finely tuned geometry deliver an astonishingly nimble ride in the urban environment.

Spot Custom Carbon Fork

Our newly designed all carbon fork rides smooth, yet is stronger and lighter that its predecessor. Steering is precise with the tapered carbon fiber steerer tube. Perhaps the highest performing street fork on the market.

Urban RocketSled Geometry

Cruise with your head up and pass on the left.

Dropout Compatibility

Newly designed Wagyū 2 Slider Dropouts allow belt-driven or chain-driven configurations, and painless wheel removal with no need to re-tension the belt.

Hydration Friendly

Water bottle mounts on down tube and seat tube.

Fender and Rack Mounts

Newly-designed frame and fork accommodate full fenders and racks, for urban versatility and utility.

Frame Size Open
Eff. Top Tube Length 22.0" (560mm)
Seat Tube Length 16.5" (420mm)
Seat Tube Angle 74º
Head Tube Length 4.5" (115mm)
Head Tube Angle 71º
Chainstay Length Min: 16.3" (415mm) Max: 17.3" (440mm) Shipped: 16.8 (427mm)
Bottom Bracket Drop 2.7" (68mm)
Wheel Base 40.4" (1025mm)
Reach 15.9" (405mm)
Stack 21.3" (541mm)
Standover 22.6" (574mm)
Rider Height 4'10" - 5'8"
Component Brand Model
Fork Spot Carbon Disc w/ carbon tapered steerer, 1-1/8" - 1-1/2"
Headset Cane Creek 10-Series
Handlebar Spot 6061-T6, 31.8mm, 620mm width, 9° sweep
Grips Ergon GA1 EVO
Stem Spot Polished alloy, 31.8 clamp, +/-6 degree, 50/52cm = 100mm, 55/57cm = 110mm, 60cm = 120mm
Brakes/Levers Sram Level hydraulic disc
Crankset Gates S300, 170mm (50/52cm frame), 175mm (55/57/60cm frame)
Front Pulley Gates CenterTrack, 46T, 130 BCD
Rear Pulley Gates CenterTrack, 22T SureFit
Belt Gates CenterTrack, 113T
Front Hub Shimano Disc front, 32°, Center Lock
Rear Hub Shimano Alfine 8-speed, disc, 32°
Rims Alex Black, AT470, 32°, aero profile, non-machined sidewalls, Presta valve
Spokes Spot 14g, stainless
Tires Kenda Tendril, 700x32C, Reflective Strip, 60tpi
Shifter Shimano Alfine 8-speed, RapidFire Plus
Saddle Spot Black with gray accent
Pedals Wellgo Black body, black cage
Seatpost Spot Spot alloy, 27.2mm, 300mm
Seat Clamp Spot Spot alloy, 31.8mm
Belt Guard Spot Custom belt guard

Mobile App for Android and iOS

Gates Carbon Drive is the high-tech belt drive offering for bicycles. Interested in key parameters of your drive like speed ratio or center distance? Want to know what belt lengths or sprocket sizes will fit your ride? What about comparing one bike to another to tweak your ratio perfectly? With our calculator and catalog, you can stay on top of the perfect setup for your drive.

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