Compatibility * These direct mount chainrings will replace your existing chainring and spider, which is attached via 3 bolts on the back side of the spider near the spindle. You will use these same 3 bolts to attach the Wolf Tooth SDM chainring. Note that the SRAM 12spd Red and Force AXS use a different 8 bolt mounting interface that is not compatible with these chainrings. * Also compatible with Cane Creek eeWing cranksets. * There are 3 offsets: * * Standard Road/CX/Gravel: 6mm offset for cyclocross and road crank applications with 47mm chainline * Standard MTB: 6mm offset for non-Boost mountain bikes, GXP and long spindle BB30 cranks for 49mm chainline * Boost: 3mm offset for 52mm chainline * BB30: 0mm offset for BB30 short spindle cranks for 49mm chainline * Fat Bikes: If you are planning to use this on an X9 or XX1 fat bike crankset with a 190/197 rear hub spacing use the 0 offset ring. If your fat bike has a 170/177 rear hub spacing, use the Standard 6mm offset * Praxis Works Road/CX cranks use the 6mm offset. Praxis Works mountain cranks use the 3mm offset for their DM-A and 0mm offset for their DM-B chainrings. * If you have a BB30 crankset (30mm diameter aluminum spindle) the measurement pictured below will help you determine whether it is a long or short spindle.

Material 7075-T6 aluminum, Made in USA by Wolf Tooth Components. Chain Compatibility: Drop-Stop A tooth profile for all 9, 10, and 11spd chains or 12spd SRAM Eagle, KMC, Connex or Wippermann chains. Offset: Boost. Teeth: 30. Mount type: Direct Mount for Sram.

Date First Available: March 4, 2017. Best Sellers Rank: #184,256 in Sports & Outdoors. Customer Reviews: 4.8 out of 5 stars 36 ratings 4.8 out of 5 stars. : B06XF3PLV5. Size: ?30t, Drop-Stop A. Style: ?SRAM Direct Mount Boost. Model Year: ?2017. Part Number: ?BST SDM 30T ELLIPTICAL. Manufacturer: ?Wolf Tooth. Number of Items: ?1. Color: ?Black. Model Name: ?Boost. Brand Name: ?Wolf Tooth Components. Item Weight: ?0.07 Kilograms. Item Dimensions LxWxH: ?5 x 5.75 x 0.25 inches. Package Weight: ?0.08 Kilograms. Item Package Dimensions L x W x H: ?7.99 x 6.1 x 0.31 inches.