Description
Not sure about the Bolt Circle Diameter (BCD) on your crank? Here’s an easy way to check!
Standard Measurement Method
| Distance Between Adjacent Holes | Resulting BCD | Typical Application |
| 43.5 mm | 74 mm | Inner ring of road triple cranksets |
| 55.4 mm | 94 mm | Older MTB or compact touring |
| 64.7 mm | 110 mm | Road Compact, CX, or older BMX |
| 76.4 mm | 130 mm | Standard Road (Shimano/SRAM) |
| 79.5 mm | 135 mm | Standard Road (Campagnolo) |
| 84.6 mm | 144 mm | Track / Fixed Gear |
Are you building a SUMO Prism Crankset? Here’s what you’ll need:
- Crank arms [See product]
- 94 BCD Spider [See product]
- 94 BCD Chainring – [See product]
- 8 mm Chainring bolts – [See product]
- Crank bolts + extractor caps – [See product]
Once these parts are ordered, we will build the crankset for you before shipping!







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