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#21
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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
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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
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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
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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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