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Old June 28th 20, 08:40 PM posted to rec.bicycles.tech
AMuzi
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Posts: 13,447
Default Crankshaft end tapers.

On 6/28/2020 2:22 PM, Dan S. MacAbre wrote:
Dan S. MacAbre wrote:
Dan S. MacAbre wrote:
Is it possible that there are more than one kind of
taper? I recently had to replace the bottom bracket
bearings on the missus' Italian bike. I had to get one a
little wider (70mm, I think) and of smaller diameter than
most; but I got a Shimano one that fitted correctly. But
since then, the LH pedal bolt has tended to slacken
slowly, and the crank makes an embarrassing creaking
noise int time with the pedalling effort oscillating from
left to right. Is it possible that the Ofmega pedals
fitted to it are not fitting the taper correctly? No play
can be felt by hand, and they are still almost impossible
to remove without lots of unpleasant hammering with a
tapered car balljoint splitter.

Speaking of which, is there a tool that can get pedals
off easily? I had a tool that screwed into the side of
the pedal, but instead of pulling the pedal off, it just
pulled out all the alloy thread that it was supposed to
fit into. Again, is that because the Ofmega pedals have
a different thread there?


An Ofmega 68C crank has appeared on eBay here in the UK,
but it is sold with Shimano cups. Is it likely that the
lock ring will fit my Ofmega cups? Did Shimano make cups
to fit Italian bikes? The set is only £2 at the moment,
but if that ring fits, I wouldn't worry about having
bought an unsuitable crank. The item description doesn't
include any actual dimensions, so it could be a completely
mismatched set. I asked the seller what diameter the cups
were, and he seems to have used a ruler to come up with a
width of 'just under 35mm,' whereas mine are 35.7mm
(probably should be 36).


Never mind - I found a 36 x 24 lock ring on its own :-)


Good solution.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


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