South Salem Cycleworks Online
(503) 480-2001
email: sscycleworks@comcast.net
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64 mm Bolt Circle Diameter, 4-bolt chainrings

64 Bolt Circle Diameter (BCD) 4-bolt chainrings on this page:
Blackspire: 22-tooth
Shimano: 22-tooth

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Bolt Circle Diameter is the diameter of the circle formed by the centers of the chainring fixing bolts. With 4-bolt cranksets, this is easy to measure. 5-bolt cranks are more difficult.

If you are unsure about what size chainring you need, Wolf Tooth Components has an excellent guide to measuring your rings.


Blackspire 22-tooth, 64 BCD 4-bolt Super Pro chainring. New, $35.00

Part# 62208

We have two in stock

Blackspire chainring

Blackspire is kind enough to put the specs on the ring.

Blackspire chainring

The back side of the same ring


Shimano 22-tooth, 64 BCD 4-bolt chainring. New, $20.00

Part# 62209

Shimano Part# SG-X M9 S-22

Shimano chainring

A serious hill-climbing chainring

Shimano chainring

The same ring flipped over