Ultimax PRO Drive Belt (146 4626U4) Options:146 4626U4 5 mm 216 mm 54 K 851144 5 mm 216 mm 54 mm 195 mm Trials High 815 mm 113 mm 84 mm 173 mm 49 mm 206 mm Trials Mid 815 mm 106 mm 77 mm 173 mm 50 mm 200 mm Windham RM Mid 800 mm 99 mm 69 mm 243 mm 54 mm 189 mm XR 50 724 mm 171 mm 152 mm 184 mm 44 mm 161 mm Yamaha Mini 730 mm 99 mm 70 mm 160 mm 58 mm 186 mm YZ High 800 mm 94 mm 53 mm 222 mm 54 mm 195 mm YZ Low 800 mm 67 mm 48 mm 219 mm 70 mm 195 mm ” improving daytime safety as well as nighttime visibility Built for quicker acceleration Belt dimensions can vary from one manufacturer to another based on proprietary design information