ISO: Chainring bolts for Torpado cottered crank
01-06-18, 01:56 PM
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ISO: Chainring bolts for Torpado cottered crank
Just picked up a nice double chainring cottered crank labelled Torpado. It was missing two of the chainring bolts (the ones that hold the smaller chainring to the larger, not the ones that hold the larger chainring to the spider).
Has anyone got a source for these? Modern style doesn't even come close. The chainring bolt itself is an M5x0.8, with a hexagonal head; spacer is 4mm; and the "nut" is that hollow tophat style with an OD of 7mm; head is OD 9mm.
Will a Stronglight/Nervar/TA style fit? Are there other Japanese/Italian brands that might have similar or identical bolts?
[edit: whoops - should have posted in the ISO forum - sorry - mods please feel free to move]
Has anyone got a source for these? Modern style doesn't even come close. The chainring bolt itself is an M5x0.8, with a hexagonal head; spacer is 4mm; and the "nut" is that hollow tophat style with an OD of 7mm; head is OD 9mm.
Will a Stronglight/Nervar/TA style fit? Are there other Japanese/Italian brands that might have similar or identical bolts?
[edit: whoops - should have posted in the ISO forum - sorry - mods please feel free to move]
Last edited by markk900; 01-06-18 at 01:58 PM. Reason: wrong subforum
01-08-18, 06:26 AM
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So to close this off, I ended up grinding down a modern M5 cap screw (though the head is 8mm instead iof 9mm of the originals), and for the backing nut (that fits into the small chainring) I found that the ones off an old crappy Silstar cotterless cranks I had lying around fit (more modern ones are larger). They're shorter but doesn't seem to make much difference. Now need a couple of 4mm spacers but for now used a stack of washers......
Here's the final result:
Here's the final result:
