Details
Mud and moving parts are enemies in the sport of cyclocross. That's why SRAM decided they were going to simplify things. Remove the front derailleur, increase the range of the cassette, make dropped chains a thing of the past, and you've got a cross drivetrain worthy of hammering. SRAM's CX1 X-Sync Chain Ring is an integral part of that system. It mates to 110 BCD cranks and features a wide-narrow-wide tooth profile to securely hold the chain through the roughest terrain. It's also specially designed with mud clearing in mind to keep your rig light and fast. A variety of sizes ranging from the spin-to-win 38T to the flat-out 46T let you dial in your rig for your strengths or course.
SRAM's X-Sync technology ensures a perfect fit between the XX1 chainring and XX1-specific chain for unheard of chain stability with no slap, no drops and no chainguide or weight penalty!
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.