Tough enough for Enduro, Downhill, and also weight conscious for XC riding, Praxis MTN Wave™ rings are machined from 7075 T6 aluminium and hard anodized to take a beating. Licensed and developed in conjunction with Mountain Racing Products, the Wave™ pattern tooth profile applies alternating lateral force to each chain link to actively retain the chain to the ring – going beyond narrow/wide implementations that rely solely on friction, while allowing room for mud, debris, and grit to escape. The Wave™ design also wears more slowly than competing designs by spreading the load over larger surface areas. Praxis Wave Wide Narrow Chainring  Installs on 4-arm 104BCD MTB crank RD- Must use ‘CLUTCH’ type rear derailleur. Example Shimano Shadow or SRAM Type 2 In very rough terrain, or just for pure security, we still recommend use of an upper guid Installs on 4-arm 104BCD MTB crank RD- Must use ‘CLUTCH’ type rear derailleur. Example Shimano Shadow or SRAM Type 2 In very rough terrain, or just for pure security, we still recommend use of an upper guide