E Thirteen TRS+ Turbocharger Dual Ring Chain GuideTRS, or Trail Security, products fill the expanding Enduro and All-Mountain categories. Engineered to take extreme punishment dealt by riders on Enduro bikes, they’re still light enough to use on XC specific bikes. Plus level products also use some of the same exotic materials as the R product level, but combined with less complex manufacturing and finishing processes to create a weight and price competitive part with class leading performance.E Thirteen TRS+ Turbocharger Dual Ring Chain Guide Features:Upper sharkfin wearplate Removable direct mount bashguard Swappable lower roller for double specific cranks Alloy backplate. Turbocharger bashguard not included. 32-40T chainring compatible. Wide required for dropped chainstays. E Thirteen TRS+ Turbocharger Dual Ring Chain Guide Specifications:backplate: 6061-T6mounting: I05, IOLD, and BBcapacity: max 36T or max 40Tbash protection: direct mount 36T or 40Tchainline: 48-53mmweight: 149 grams (36T I05)Buy E Thirteen TRS+ Turbocharger Dual Ring Chain Guide from Chain Reaction Cycles, the World's Largest Online Bike Store.