Re: Adjustable Cranks - Kooka mod ?

Kookas are really fat cranks, so should be good candidates for drilling
an extra hole as you suggest. In my experience, cranks usually bend
rather than breaking. So the question is if this new hole will cause the
cranks to bend when you're cranking hard on the 170 holes.

Well, it would be interesting to find out. Only you can decide if you
want to make the experiment.

The extra end of the crank going around has not been reported as a
problem from anyone I've read about. Several people have tried pre-made
multi-hole cranks or made their own. If your feet get bumped around on
the pedals this could become a problem, but I don't think it will be a
major issue.

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Do you think it would be a good idea to drill and tap 1/2 inch pedal
holes instead of 9/16? It would mean that you wouldn't be able to use
the pedals, but it would mean drilling a smaller hole and weakening the
cranks.

This is a product I was wondering if anyone has experience with
[image: http://www.sheldonbrown.com/harris/images/CR8870C.JPG]

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daino149 said:

*Do you think it would be a good idea to drill and tap 1/2 inch pedal
holes instead of 9/16? It would mean that you wouldn't be able to use
the pedals, but it would mean drilling a smaller hole and weakening
the cranks. *

If you're going to do that and only using the cranks on a coker or
something not uber hardcore, you might even consider retapping the
cranks for a 1/2'' pedal hole. You may even be able to get a 1/16''
helicoil that makes a 1/2 out of 9/16 so you don't have to retap the
cranks.

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Thanks guys.

John, I appreciate the input that suggests, "The extra end of the crank
going around has not been reported as a problem..." That's helpful
info, especially since I have never used cranks with multiple pedal
holes. Regarding the strength, I'm far from hardcore and the most
likely problem may be a Coker slammin' UPD. I think I will move forward
with this Kooka modification and add another set of pedal holes.

High end, cranks at 'daVinci'
(http://www.davincitandems.com/comp.html#cranks) are tempting. Three
pedal holes: 130, 150, & 170. Billet process reportedly produces a
strong crank, with each piece being milled from a solid block of
aluminum. I visited with Todd today; he said they need orders in
_by_Thursday_of_this_week,_Feb._3,_2005_, if anyone wants a pair. To
keep costs down, they apparently manufacture only once a year and that
begins Friday. Uni crank pairs have proven to be slow movers, probably
due to the stout price of $200. Still, I am tempted. It would be great
to easily change crank lengths using a strong, well manufactured set.

Daino and Obie, I will consider the 1/2 inch size, as well as helicoil.
I am guessing: is a helicoil is an insert threaded on both inside and
outside that shrinks the pedal hole size?

Thanks again.

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