on 24 Jul 1995, Doug Borngasser Said:
> Does anyone know much about “cut down mountain bike cranks?” I’ve seen them
> mentioned in a few posts and was wondering what was involved.
- Find the cranks; this for me was reletively easy I hunted around the
mountain bike shops in this area and found discarded ones with stripped
pedal threads. I have one capagnolio and one shimarno - no it is not pritty
like that. The main problem with them is the large offset on them - it would
be better if you could find some with very little offset (your feat are just
a little bit too wide for good riding).
- Decide how long you are having the cranks; the longer the better for
leverage, but this gives more movment on your seat which makes it harder to
ride. Mine are 150mm long on a 26" wheel, which seams to be about right. I
was able to get up steeper hills offroad than a 20" with 135mm long cranks
(but only just).
- Drill new pedal holes; Ahhhhhhhhhh, no it is not that bad. They must be
parrollel to the hub. Pilot holes are a help. As for size, it depends on how
you are doing it,
a) tap holes for pedals - this requires 2 silly sized taps that will
only be found at your local bike shop.
b) helicoil the thread - this again is a silly size and guess what,
will only be found at bike shops. the long and short of it is: find
out what is available in your local bike shop and drill the holes to
suit. My local shop only had helicoils, where as the one that Jez
found only had taps.
- Tap the holes; I did it my self with the scrounged kit and it took me
absolutely ages, so I would advise you to give them the hernia and get
them to do it.
- Cut the extra bit off
- POWER FILE! - my favorate toy; tidy the ends up and polish
Fit to uni and you will then have light waight longer cranks! Have fun.
I am presently persusading a friend of mine to manufacture some carbon fibre
cranks 150 long with very little offset. I think a few more drinks and I will be
there. When that happens I will tell all, because they will be very, very light
and really sexy.