PowerTap C1 Chainrings w/Sensor
Details
The C1 chainring is a full featured, crank-based power meter that features dual-sided measurement. The FSA-made, one-piece chainring design provides added stiffness for shifting no matter the terrain. Available in 53/39, 52/36 and 50/36 chainring tooth options for 5 bolt, 110 BCD cranks, the C1 mounts to existing hardware on the bike. Additionally, dual band ANT+ and Bluetooth SMART connectivity make the C1 an obvious choice for riders looking for more features and better value.
To choose the correct chainring, 1) determine the number of teeth (they're usually marked, or simply count them), 2) determine how many bolt holes there are (usually 4 or 5), and 3) determine the Bolt Circle Diameter (BCD; see diagram).
Common BCDs include:
130mm (Shimano Road)
135mm (Campagnolo Road)
110mm (Compact Road)
and
104mm, 94mm, and 64mm (Mountain)
Finding the number of teeth and bolts holes is easy. If you don't know your chainring's BCD, measuring it is tricky. So, instead, measure the exact distance (center to center) between 2 adjacent bolt holes. Then find that number on the correct chart below to determine the BCD for your chainring.
| BCD Chart for 5-bolt Chainrings | |
| Bolt to Bolt (measure center to center) | Bolt Circle Diameter (BCD) |
| 32.9mm | 56mm |
| 34.3mm | 58mm |
| 43.5mm | 74mm |
| 55.4mm | 94mm |
| 64.7mm | 110mm |
| 76.4mm | 130mm |
| 79.5mm | 135mm |
| 84.6mm | 144mm |
| BCD Chart for 4-bolt Chainring | |
| Bolt to Bolt (measure center to center) | Bolt Circle Diameter (BCD) |
| 41mm | 58mm |
| 45.3mm | 64mm |
| 48.1mm | 68mm |
| 73.6mm | 104mm |
| 79.2mm | 112mm |
If you have any questions concerning chainring compatibility, please contact us.
Videos
Tools You Will Need to Install the C1 Chainrings
How To Install The C1 Chainrings
Cycling Cranks Compatible With The C1 Chainrings
Battery Install For The C1 Chainrings
Part Numbers
| Option | UPC | MPN | Store SKU |
|---|---|---|---|
| 50/36 | 012527014071 | 30421 | POW32415452T |
| 52/36 | 012527014088 | 30422 | |
| 53/39 | 012527014064 | 30420 |
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