Features 1、Made of steel, wear resistance, high temperature resistance, corrosion resistance, rust resistance, no deformation, good impact resistance. 2、Hollow design can easily reduce weight and riding burden, achieve a good balance between strength and weight, easy to install and use. 3、The special high‑precise tooth and slope provide fast and accurate conversion function, with stable gears and precise positioning in the 8‑speed range. 4、The small teeth of cassette flywheel are often used, and the independent small tooth design is convenient for future replacement and maintenance. 5、Easy to install without adjustment, great replacement for old or damaged flywheels of mountain bikes and road bikes. 6、Fit for Sram 8‑speed drive system (except for Sram XD), 8 speed freewheel with 11‑13‑15‑17‑19‑21‑24‑28T teeth. Item Type: Cassette Flywheel Material: Steel Color: As Picture Shown Weight: Approx. 288.0g/10.2oz Speed: 8 Speed Teeth: 11‑13‑15‑17‑19‑21‑24‑28T Package List 1 x Cassette Flywheel 2 x Flywheel Teeth Ring 1 x Locking Ring