Where grip and light weight are your main priorities the Gecko carbon is the road-disk, gravel or cyclocross wheelset for you. With an internal width of 21mm the only limit is your frame clearance. We recommend a minimum tyre width of 25c on these rims and a maximum pressure of 80psi.
Hubs are 6 pawl, 48 point engagement hubs with premium stainless bearings.
Built onto our carbon Gecko rims in 650b size. Rims are asymmetric for maximum strength and stiffness at very low weights, and are tubeless ready – supplied with tubeless tape fitted, valves available separately. The rims have a hookless bead for strength which means tyres should be inflated to a maximum pressure of 80psi. As all tyres come up wide on these rims 80psi is plenty, for example a 25c Schwalbe Pro Ones tubeless will measure up at 28mm wide. The rims have a matt UD finish with grey transfer Gecko decals, and no braking surface.
The wheels are finished with tubeless rim tape but valves are extra. A crash replacement scheme applies to all JRA carbon wheelsets.
hubs: jra hubs 24 hole – choose from J-bend or Straight-pull, centre-lock or 6-bolt disk mount.
freehub: Shimano road 11spd (with spacer for 10sp), Campagnolo or Sram XD/XD-R option.
front axle: QR, 9mm, 12mm or 15mm
rear axle: QR, 12x135mm or 12x142mm
Please note that straight pull hubs don’t offer Boost 110/148 axle options.
rims: JRA carbon Gecko 650gc. 375g rim weight, 27mm external, 27mm depth and 21mm internal width. 650b rims are symmetrically drilled.
spokes: Sapim CX-Ray bladed – black
weights: Weighed with 15mm front, 12x142mm rear axles; other end caps and small variations may add up to 20g per wheel. Weighed without rim tape which adds about 10g per wheel:
Straight-pull centre-lock wheelset: front 575g / rear 699g / pair 1274g
J-Bend centre-lock wheelset: front 616g / rear 716g / pair 1332g
decals: rims have grey transfer decals. Hubs – choose from the colours listed in the drop-down menus.
Gecko 650b carbon rims
• Toray carbon with smooth matt UD finish
• Hookless sidewalls
• 650b rims are symmetric
• suits tyres 25c or larger
• maximum tyre pressure 80psi
• weight: 365g (+/-15g)
Verdict: Brilliant lightweight wheels that’ll take plenty of abuse from gravel tracks or rough roads
Overall score: These are a very good set of wheels from JRA, striking just the right balance between lightness for performance and strength for fast gravel riding or on the road. The build quality and finish represent decent value for money too.
READ THE WHOLE REVIEW ON ROAD.CC
(opens new window)