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question: Mid compact rings fit compact or standard crank?

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question: Mid compact rings fit compact or standard crank?

Old 05-17-16, 01:10 PM
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look171
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question: Mid compact rings fit compact or standard crank?

I have a 10 Spd standard 53x39 crank and would like to install mid compact of 52x 36(?). It is possible? What about putting a set of mid compact rings on a compact crank, 10 spd DA also. Thanks
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Old 05-17-16, 01:59 PM
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"Standard" road bike cranks have a BCD (bolt circle diameter) of 130 mm. Compact cranks are 110 mm. Not sure what the difference between mid compact and compact is. MTB cranks are usually 104 mm with the granny 64 mm.
So chain rings are not transferable between.

https://roadcyclinguk.com/gear/evolu...i-compact.html

Last edited by Slash5; 05-17-16 at 03:48 PM.
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Old 05-17-16, 08:37 PM
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Mid-compact is what the marketers call 52-36. 36t doesn't fit on 130 BCD, so it's 110.
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Old 05-18-16, 01:25 AM
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Originally Posted by oldbobcat View Post
Mid-compact is what the marketers call 52-36. 36t doesn't fit on 130 BCD, so it's 110.
Ok, so it will fit the 110 or the compact Shimano crank?
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Old 05-18-16, 06:26 AM
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Originally Posted by look171 View Post
Ok, so it will fit the 110 or the compact Shimano crank?
Shimano's compact cranks (Dura Ace and the others) all have 110 mm bolt circles so you can build a 52/36 crank on any of them.
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Old 05-18-16, 09:13 AM
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Cool. Thanks guys
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Old 05-18-16, 09:26 AM
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Originally Posted by HillRider View Post
Shimano's compact cranks (Dura Ace and the others) all have 110 mm bolt circles so you can build a 52/36 crank on any of them.
The latest generation of DA and Ultegra, 5800 105 all take 110mm rings. You can mix/match ring sizes and while the colors don't match, you can even mix the rings / arms of the groups. If you look at Shimano docs, they show the specific combinations such as 34/50, 36/52 and 39/53 as sets, but I run 36/50 all the time and pros seem to mix up the sizes as needed also. Just don't go more than about 16 teeth apart between the rings and be aware of the overall capacity.
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