110 to 74 BCD adaptor
07-12-09, 02:29 AM
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110 to 74 BCD adaptor
Am I right in thinking that the item listed here https://www.seattlebikesupply.com/item/127776will let me replace my current 34T compact inner (110 BCD) with something smaller in 74 BCD? I'm confused by the picture. I would have expected to see two sets of holes.
07-12-09, 06:52 AM
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I think Perhaps that spider is for cranks that have removeable spiders (note the hole for the crank arm notch to be bolted into. I would not think that it would adapt 110 to 74, but be 110 for the big rings and 74 for the granny.
07-12-09, 01:51 PM
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Am I right in thinking that the item listed here https://www.seattlebikesupply.com/item/127776will let me replace my current 34T compact inner (110 BCD) with something smaller in 74 BCD? I'm confused by the picture. I would have expected to see two sets of holes.
If you want to keep your existing crank and install a 74mm bolt pattern ring (that is, anywhere down to 24 teeth), you need one of these:
https://store.interlocracing.com/cotrch.html
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07-12-09, 01:53 PM
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Note that it says "Works with most tubular cranks that use a 19mm spindle." It's for BMX-style 3-piece steel cranks.
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07-12-09, 08:41 PM
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You can't put anything smaller than 33 teeth on a 110mm bolt pattern- the chain will intersect the bolts.
If you want to keep your existing crank and install a 74mm bolt pattern ring (that is, anywhere down to 24 teeth), you need one of these:
https://store.interlocracing.com/cotrch.html
If you want to keep your existing crank and install a 74mm bolt pattern ring (that is, anywhere down to 24 teeth), you need one of these:
https://store.interlocracing.com/cotrch.html
