BBK Short Cranks
These cranks are intended to make it easy to get the correct crank length for Junior riders or rpovide an aero TT position for better hipangles. A rider on a 1 thousand dollar bike with good wheels and the correct cranks for their rollout will be better off than a rider on a 6 thousand dollar bike with the wrong length. We are offering either 34/46 or 34/50 at this pricw, 52/36 is also available at a small upcharge. They will fit any bike that can use Shimano cranks, however you will adaptors to convert to GXP format. Lengths are 145/155/165/170mm
They are a nice quality 6061 forged unit.
If a rider is doing a 12 second 200m on a 6.0m rollout (under 15) the foot speed they need to achieve is as follows on 145mm cranks 91kph , on 155mm cranks 97kph on 165mm 103kph and on 170's which are the most common fitted on off the peg bikes 107kph so with pedal speed being a huge factor in junior categories you really don't want to be running 170's on your under 15 rider.
715 gram (155mm 46/34)
