Bicycle Mechanics - Replacing an internal hub
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09-13-10, 11:04 AM
I have a Dutch three speed (Gazelle Toer Populair) that I want to convert to a five-speed. Simple enough? At present, the bike has a Sturmey-Archer AB hub with a drum brake that is rod-activated. Sturmey-Archer makes a five-speed wide-range model with the same drum brake setup -- the XL-RD5(W). My idea is to replace the old hub with the XL, using the old rim but essentially building up a new wheel.
Any unforeseen headaches anyone can see? I know I'll need to have the frame stretched out in the back by about 6 mm on each side. Anything else? Am I crazy?
09-13-10, 11:30 AM
are the old wheels steel or alloy? you can't find a decent prebuilt wheel/set that will work on the bike?
the axle will fit the dropouts right? not the spacing as noted above but actually go in the slots?
09-13-10, 11:38 AM
Sounds reasonable, especially if you do the work yourself. It would be pretty expensive to pay someone to do it.
09-13-10, 11:56 AM
axles same length?
Probably need different length spokes , unless hub flange diameter and the width of the flanges apart are identical ,
But other than that , since you are getting another drum stopper that should be fine ..
people have reduced the width by changing the spacer/nut combo on the left side.
09-13-10, 05:25 PM
Thanks for the input. I am not yet discouraged! The axle is indeed the same diameter, so it should fit in the dropouts. Is there a downside to changing the left-side spacer/nut?
09-13-10, 05:40 PM
You have data on the overlocknut width distance of the 2 hubs in question?
people have used much wider hubs in narrow dropout frames
like fitting Sturmey 8 speed hubs in Brompton rear ends by shortening the stack on the one side it's possible .
then there may be some 'dish', re-centering the rim as the center line between the hub flanges is displaced
from under the center line of the rim ..
Rod brake likely replaced by a cable operated brake .. simple enough housing runs from handlebar lever
to the stop on the hub..
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