SRAM XX T-Type Chainring Exceptional Quality Eventually, you'll want to replace your worn-out chainrings. Luckily, these chainrings are easy to find and easy to replace. The SRAM XX T-Type Chainring is designed for use with E-MTB motors including the Brose, Bosch, and STEPS systems. These replacement rings come with a steel and aluminum construction and are Aero Guard compatible. Features Designed for use with E-MTBs Construction: steel and aluminum Compatible with T-Type chains SPECIFICATIONSDrive Train Speed12Tooth Count34T, 36TMaterial Aluminum Direct Mount Type Direct Mount Chainline-Offset-Intended Use Mountain Weight185g (36T)Chainline/Chainring Offset Guidelines Rear Spacing135mm / 142mm148mm Boost Super Boost 150mm / 157mm Fat Bike (170mm, 190mm, 200mm)Chainline48 - 50mm51 - 53mm54 - 56mm56mm+Chainring Offset~6mm~3mm~0mm~+2mm | Sram | Xx T-Type Chainring 34T Brose Direct Mount | Aluminum