Bicycle Mechanics - Can you convert an Ultegra 6600 standard crank to compact?
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05-09-11, 10:54 AM
I have two cranksets, a 52/39 Shimano 6600 and a cyclocross FSA MegaExo 48/38. I want to convert one of them to compact 50/34 instead of buying another crankset. Which would be the easiest to do it with and what chainrings would I need?
05-09-11, 11:21 AM
The 6600 crank has a BCD of 130mm, which, as I understand means that you can't get to a 34 tooth chain ring that requires a 110 BCD. What is the BCD on the FSA crank?
05-09-11, 11:43 AM
Yup, 38t is as small as the 130 bolt circle allows,
but, there is nothing to keep you from fitting a smaller big chainring.
so perhaps buy a 48 38 combination, of 2 after-market chainrings?
If you want 34 t , you have to buy a 110 BCD crankset.
05-09-11, 02:08 PM
What about the cyclocross crank? Its 36/46 says it is 110BCD. Are 50t rings 110?
50t chainrings are available in either 130 or 110 BCD.
05-09-11, 02:17 PM
Your easiest and only option is to purchase a set of 110bcd 50/34 fsa rings. Make sure you get the new ones marked 'N10' on them. Not the old ****ty gossamer ones.
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