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Crankshaft end tapers.



 
 
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  #21  
Old June 28th 20, 08:08 PM posted to rec.bicycles.tech
Dan S. MacAbre
external usenet poster
 
Posts: 37
Default Crankshaft end tapers.

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).
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  #22  
Old June 28th 20, 08:22 PM posted to rec.bicycles.tech
Dan S. MacAbre
external usenet poster
 
Posts: 37
Default Crankshaft end tapers.

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 :-)
  #23  
Old June 28th 20, 08:39 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 11,887
Default Crankshaft end tapers.

On 6/28/2020 2:08 PM, 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).



Spindle matches crank.
Thread matches frame.

I and others set you on the path to the correct spindle.

Italian format is m36x24tpiW
British standard is 1.370"x24tpi (about 34.8mm)

Shimano, Ofmega and everyone else makes (or made) various
threads[1] for each of their products so you could, ideally,
buy their crank to fit into most bicycles[2]

Did your ebay vendor indicate what thread he's selling?
Shimano cup thread is well marked.

Also the lockring failure as described is most probably an
installation/maintenance error not an actual product defect.

[1] Some obsolete frame thread formats are abandoned now.
Crank makers more or less offer way too many push- or
press-in formats for modern cranks in modern frames. Choice
of six different frame thread formats was simpler IMHO.

[2] Generally but never universally. Not then not now.

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


  #24  
Old June 28th 20, 08:40 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 11,887
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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