Clutch Spring
① Synchronous lamba pulley MXL XL LH XH XXH② Trapezoidal zida synchronous lamba pulley T2.5 T5 T10 T20 AT5 AT10 AT20③ Arc Gear Synchronous Belt Wheel: HDD (3M 5M 8M 14M 20M) STD/STS (S2m S3m S4.5m S5m 8M S14m) RPP3m RPP5m RPP8m RPP14m 3GT 5GT 8GT 14GT