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Can I use a chainring from my TRIPLE to my DOUBLE?

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Can I use a chainring from my TRIPLE to my DOUBLE?

Old 01-18-12, 12:22 AM
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Biscayne05
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Can I use a chainring from my TRIPLE to my DOUBLE?

I was thinking of buying a black 39T chainring for my double (I just want the crankset blacked out, already have the Black 53T laying around). I have a bike which uses a Triple (50-39-30) and luckily the 39T is in Black.

Will it work assuming that the BCDs are matching? or does the triple use a different bolt pattern?

Thanks
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Old 01-18-12, 01:36 AM
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xenologer
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Yes
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Old 01-18-12, 01:39 AM
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can't see why not, .. well I cant see anything anyhow,this is Text.
the shift pins and such details on the Middle ring , might want to go further
inboard, but putting a Physical stop like a Chainminder .. should catch things

or does the triple use a different bolt pattern?
some may , I've not seen everything ever made.
people say some hidden bolt cranksets do.
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Old 01-18-12, 07:07 AM
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Never seen a triple with a 39 as smallest chaining tho, so if its the same bcd than the road crankset doubt you will have a single problem.
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Old 01-18-12, 07:12 AM
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I recently found out that the Octalink Dura Ace cranksets use a 130mm BCD chainring but are incompatible with other chainrings because of a lip designed into the crank spider that differs from the mainstream 130mm setups. The inner ring also has a unique BCD that is incompatible with inner rings from other triples.
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Old 01-18-12, 09:43 AM
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Biscayne05
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thanks guys
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Old 01-18-12, 11:08 AM
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Originally Posted by ultraman6970 View Post
Never seen a triple with a 39 as smallest chaining tho, so if its the same bcd than the road crankset doubt you will have a single problem.
Read more carefully. The OP's triple is 50/39/30 so it's likely a 105 triple.

To the OP: The 39T chainring from the triple will have ramps and shaped teeth to speed the shift from the 30 up to the 39 that a 39T from a double won't have or need.
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