Hi, I'm looking for a chainset 175mm front crank and 165 rear. Without opting for very high end expensive sets, it appears I can buy seperates but need to get the threads changed over left/right etc. this can be done by helicoiling and is offered on the web. anyone have any experience with this or solved such a problem in other ways please? For the cross overs, I'd buy doubles and use only the inner only, while giving me spare outers for the rear triple. I could get a nice stronglight set-up for around £200 this way, just the threading on top or buy the tap set my self. I am an engineer BTW.
Is there no simpler way
Assuming that the 11mm difference is wanted for the comfort of the stoker, or to enable the stoker to be able to reach the pedals would it not be easier to find shoes with thicker soles or a means of altering the pedals.
I am assuming that the stoker's saddle is as close to the frame as possible and that a shallower profile saddle would not suit the rider.
Thanks for the links, i'll check these out. For clarification, the length difference is about cadence. i'm comfortable at 100rpm, but my wife around 85-90rpm. Reducing the crank length, does not reduce cadence, but it does reduce the pedal circle and as such the speed, making it more manageable when there is a mismatch.
Why do you need to change threads, can't you just put axle other way round in cups?
Need to chenge the pedal threads or they'll come unscrewed. But the Thorn Cranks link above has solved the issue, along with SPA chainreings.
Thanks to Stuart above.