Q42 and Q47 cranksets
160mm or 165mm crank length (other crank lengths to follow). The Q42 spider is designed for track bikes and the Q47 for road/TT bikes. The spiders are interchangeable, so either can be used with the same cranks.
Designed to fit 30mm diameter BB (not supplied).
The cranks, spiders and chainrings are all designed, manufactured, anodised and decaled right here in the UK. Our Instagram feed has lots of photos and videos of our manufacturing and decaling.
Technical and aero testing information
We've done extensive development work, FEA, CFD and wind tunnel testing on our cranks. We have prioritised aerodynamics and stiffness, which is why we've opted for a solid spider and crank arm with no pockets machined out, and a 144 BCD-compatible spider only. For the same reason, we decided against trying to make a power crank, as this would necessarily compromise stiffness to enable power meter readings. The cranks and spider weigh 996g.
The wind tunnel testing shows that at 50kph, and yaw angles of -5 to -10 deg, our crank with a 1x chainring (so no front mech) performs 11 watts better than a Shimano DuraAce crank with a 2x set up and a Di2 front mech. At 60kph, the difference is 13 to 16 watts. Compared to a Shimano DuraAce crank with a 1x chainring and no front mech, our crank performs 5 to 8 watts better.
For a short video on our development and testing, including graphs of the wind tunnel results, click here.
What's in the box?
Either Q42 or Q47 spider, cranks, 30mm axle, spider lockring, crank self-extraction bolts and washers, pre-load and wave washer, c-spanner for pre-load and 1.5mm hex key for pre-load.
Drive-side crank, spider, lockring and axle will come pre-assembled (to dis-assemble to change spider, see below). Non drive-side crank and pre-load will also be pre-assembled.
Crankset fitting instructions
Tools required:
- Torque wrench
- 8mm hex key
- 1.5mm hex key (supplied)
- C-spanner (supplied)
- Grease
1. Put drive side BB dust cover in place.
2. Push drive-side crank/spindle through BB from drive side.
3. Put non drive-side BB dust cover in place.
4. Put wave washer on spindle on non drive-side.
5. Put non drive-side crank onto spindle, adding grease to the inside of the threads. Use 8mm hex key to tighten (turning clockwise, as shown on the self-extraction bolt cover). Max torque shown is 54NM, but we recommend 30 - 40NM.
6. Tighten pre-load using C-spanner, to point where wave washer is mostly, but not completely, compressed.
7. Tighten pre-load hex bolt using 1.5mm hex key. Do not overtighten!
8. Fit chainring and chain.
To remove crankset, reverse these steps. Note that the self-extraction bolt covers are never removed.
For a short video showing these steps, click here.
Spider removal and refitting instructions
Tools required same as above, plus a ParkTool BBT-22 bottom bracket tool for spindle lockring. Remove crankset from bike using instructions above.
1. Remove crankset using instructions above.
2. Use 8mm hex key in self-extraction bolt to remove spindle from drive-side crank (turning anti-clockwise).
3. Use BBT-22 tool to remove spider lockring (turning anti-clockwise).
4. Drive-side crank and spider will then separate.
5. Fit drive-side crank into new spider. Grease inside of threads and then use BBT-22 tool to tighten spider lockring (turning clockwise, max torque 40NM).
6. Grease spindle end and fit into spider and tighten using 8mm hex key in self-extraction bolt (turning clockwise). Max torque 54NM, but we recommend 30 - 40NM.
For a short video showing these steps, click here.
7. Fit to bike using crank fitting instructions above.