Step-up to better chain retention with the Modified Guidering! Optimized tooth profiles and chamfers provide greater chain retention than standard rings. Months Shop w/ Free Shipping | e*thirteen M Profile 10/11-speed Guide Ring 30t 104BCD Narrow Wide, Black | Chainring | CR.M-104.30.K | 104BCD M Profile Guide E * THIRTEEN chainring Guide Ring M Direct Mount Narrow Wide BOOST In the guide ring M, the tooth profile has been optimized to keep the chain optimally. Buy your e.thirteen Guidering M Narrow/Wide Chainring - Chain Rings from Wiggle. SAVE 21% - RRP ?42.95 now only ?33.80. Free worldwide delivery 15 Aug 2018 Buy your e.thirteen Direct Mount Guidering M Narrow/Wide Chainring - Chain Rings from Wiggle. SAVE 14% - RRP ?46.95 now only ?39.99. 24 Jun 2013 Reviews, ratings, specifications, weight, price and more for the e*thirteen Guidering M Chainring. View our MTB Chainrings buyer's guides. Ring chamfer facilitates secure chain engagement, even at extreme angles . retention capabilities of the chainring and other narrow/wide ones when using a Find great deals for E*thirteen Guide Ring M Narrow Wide Chainring 10/11 Speed 36t Black BCD 104mm. Shop with confidence on eBay!Shop w/ Free Shipping | e*thirteen Direct Mount M Profile 10/11-speed Guide Ring Boost Chainline 28t Narrow Wide, Black | Direct Mount Chainrings E Thirteen Guidering M Narrow Wide Chainring - Lowest Prices and FREE width tooth design to help keep your chain locked on your ring and not dropped on