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3

No, compact chainrings have 110 BCD (bolt circle diameter) while standard chainrings have 135 BCD.


0

Most manufacturers set maximum gear jump as 16t. I personally ride a 24/40t set and have no poblems with it with no additional equipment. So from technical point view the difference isn't too significant and all that matters is what's more comfortable for you to ride.


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I have a 12 tooth jump on my granny gear from 30 to 42 and don't have any shifting problems using Shimano 2300 level equipment. A standard compact crank is 34/50 which is a 16 tooth jump, so 12 teeth really shouldn't create a lot of problems.


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There are (generally speaking) four types of modern bike cranks: single, with one front gear; triple, with three front gears; standard double, with two front gears, and lastly, compact, which is a double with smaller diameter chainrings. The difference you are describing is between a standard and compact double. A standard was once 52 (or 53) paired with a ...


3

I can't see how a flat inside ring with no pick-up points machined into it wouldn't be compatible, providing the bolt patterns match up (which they do, I think). The bolt patterns are compatible. There are two reasons why the chainrings still may be counted as non-compatible: Not all Shimano chainsets have identical fitting of the chainring, ...



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