CG125 motorcycle chain adjuster, aperture 18mm, thread M6, length 45mm, the mounting holes perfectly match the swingarm and rear wheel axle, symmetrical design allows direct replacement without modification, suitable for 125cc single-cylinder pushrod engine transmission system; made of high-quality low-carbon alloy steel forged in one piece, after quenching the hardness reaches HRC38-42, tensile strength ≥600MPa, impact resistant and not easily deformed, service life increased by 50% compared with ordinary iron plate adjusters; surface marked with clear scale indications, left and right adjustment turns can be accurately corresponded, ensuring rear wheel axle alignment, solving chain wear and skipping teeth caused by blurred scale on old adjusters; surface treated with blackening and passivation for double rust prevention, salt spray test ≥72 hours, suitable for outdoor humid and dusty riding environments, resistant to rust and oxidation in long-term use; comes with M6 threaded adjustment bolt, turns smoothly without sticking, chain tension can be adjusted without professional tools, single person can complete maintenance in 5 minutes