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104mm Bolt Circle Diameter, 4-bolt chainrings

104 Bolt Circle Diameter (BCD) 4-bolt chainrings on this page:
Blackspire: 46-tooth
IRD: 32-tooth
RocRide: 30-tooth
Shimano: 32-tooth
TruVativ: 32-tooth
Vuelta: 32-tooth
Unknown Maker: 45-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.

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Blackspire 46-tooth 104 BCD 4-bolt downhill chainring. Lightly used, $50.00

Very lightly used

The same ring flipped over

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IRD 32-tooth 104 BCD 4-bolt chainring. New, $35.00

Part# 62451

• Though engraved "9 Speed", it will work in 8, 9 & 10-speed applications
• 7075 aluminum alloy
• We have three in stock

Nicely finished

The back side

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RocRide 30-tooth, 104 BCD 4-bolt chainring. New, $15.00/each

Front side.

Here's the back of the chainring.

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Shimano XT/LX 32-tooth 104 BCD 4-bolt chainring. New, $40.00

Part# 62452

• Made of steel
• Ramped and pinned for great shifting

Made it steel, it will really last.

And the other side

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TruVativ 32-tooth, 104 BDC 4-bolt chainring. New

Part# 62451

Pinned and ramped

You can barely see the ramps, but the pins show up nicely.

Here's the other side

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Vuelta 32-tooth, 104 BCD, 4-bolt chainring. Very lightly used, $35.00

Part# 62451

• Pinned and ramped
• Made in the USA
• 8/9-speed compatible
• 6061 T6 aluminum alloy

Front side

And the side with the ramps and pins.

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Unknown Maker 45-tooth 104 BCD 4-bolt chainring. Used, $25.00

The maker did not stamp his name on the well-made chainring.

The outside.

The same ring flipped over.