SPROCKET REAR MTX 857 39T #520
MTX OE Steel sprockets are strong and durable, heat-treated and hand-finished for longevity. Front sprockets are constructed from SCM420 chromoly steel alloy where rear sprockets are constructed from C45 high carbon steel with a Zinc electroplated finish. Designed as an OEM replacement to exceed OEM specifications at a fraction of the price, making them your ideal cost-effective solution for replacing old worn and warped sprockets.
Exceeds OEM specifications
Heat treated and hand finished
Constructed from C49 high carbon steel
NOTE: Actual sprocket design may be different from the image above.