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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
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.


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

Blackspire chainring

Very lightly used

Blackspire chainring

The same ring flipped over


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

IRD Chainring

Nicely finished

IRD Chainring

The back side


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

Part# 62452

  • Made of steel
  • Ramped and pinned for great shifting

Shimano chainring

Made it steel, it will really last.

Shimano chainring

And the other side


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

Part# 62451

Pinned and ramped

Truvativ chainring

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

TruVatic chainring

Here's the other side


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

Vuelta shanring

Front side

Vuelta chainring

And the side with the ramps and pins.


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

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

45-tooth black chainring

The outside.

Chainring

The same ring flipped over.