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FAQ > WHEELS

Can I change the chainring ratio of my 4-arm Campagnolo chainset?

4-arm chainsets can be set up with any of the ratios, as the BCD (bolt circle diameter) is the same on all Campagnolo 4-arm chainrings*. However, the chainring ratios must be maintained: 50/34, 52/36 and 53/39.
*There is one exception to the rule, which is the Chorus 12 speed chainset, which has a specific BCD of 123/96. This means that Chorus 12 speed chainsets can only be fitted with 48-32, 50-34 and 52-36 ratios.

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