Technical & Reference Section > Tech and Restoration

BCD on a chain ring

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bobbbbsy:
pretty good that sean - or

 sheldon says - Measuring BCD: This 110 mm BCD ring measures 64.7 mm center-to-center.

Multiplying this dimension by 1.7 will give you the actual BCD for a 5 bolt chainring.

Use 1.4 for 4 bolt chainrings

That Swan Guy:
Aren't Sugino rings both?

Jaan:
No, typically they're 110

snoopy72:
Takagi 130bcd
Sugino 110bcd
Pro / tuf neck  110/130
Takagi MX 120bcd
PPP  110/130bcd
Shimano 130bcd

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