Round CX1 130x5 Chainrings

Narrow-wide Round chainrings for Cyclocross in 130BCD. Size (Mass +/-1g): 42T - 64g ; 38T - 49g Color Black, Racing Red Compatibility All 5 arm cranks with 130 BCD Material cnc machined 7075 Txxx Aluminum. Long-lasting construction Finish type II anodizing Mounting holes 130mmx5   Its specially designed wide-narrow tooth profile keeps the chain really snug, allowing you to leave your chainkeeper in the garage. It saves more than 100g on average by removing the chainkeeper and the bashring from your existing 1x setup, or more than 200g if using 2x drivetrain. Works with Clutch type and non-clutch rear derailleur. The chainring is optimized for running in the mud, having specially designed chamfers. Always use a new chain with a new chainring. Suitable for Singlespeed conversions. Chain options 10 or 11spd chain for geared bike or 6-8 spd for SS. If used in 1x9 drivetrain - 10spd chain must be used to obtain the performance. (yes - 10spd chain will work great on 9spd cassette) Chainguide needed? No, but chainlength is important as you don't run clutch type rear mech. Short cage really recommended.