Bolt-on installation - No modification required

You'll have total throttle control

The waist is tightened with the cords

Double regulation of the circumference of the sleeve allows you to optimally adjust them to your figure

What is S4 for something

PBR Standard C45 Steel Rear Sprocket 820 - 520 820 43 C45 tm-racing-en-450-fi-450-2019-esi2020305 Bolt-on installation - No modificationRace Experience Thanks to Many Years of Competition Experience, PBR Developted A Wide Range of High Quality Sprocks in Collaboration with Top Teams. High Quality Steel Alloy 18NCD5high Wear Resistance Reduces High Precision Manufacturing Chain Pitch: 520. 0 Color: Black Materials: Steel Rear Teeth: 43. 0 REAR TYPE: 820 REAR Version: Standard