MTX 857 Steel Rear Sprocket #520
| Size | Part No | Reference |
| 45T | SPR85745 | 11-5Y1-45 |
MTX OE replacement front sprockets are constructed from SCM420 Chromoly steel alloy where rear sprockets are constructed from C45 High Carbon Steel and Zinc Electroplate finish.
- HIGH QUALITY STEEL HEAT-TREATED AND HAND-FINISHED FOR LONGEVITY
- ELECTROPLATED ZINC FINISH ANTI-CORROSION & WEAR RESISTANCE
- DIRECT REPLACEMENT FOR OEM FITMENT
- WIDE FITMENT RANGE 415 - 630 PITCH AVAILABLE