What is the standard for motorcycle chain tension?
2 Answers
Motorcycle chain tension standard is: Use a screwdriver to vertically push upwards at the lowest point of the lower part of the chain with force. After applying force, the relative displacement of the chain should be 15 to 25 millimeters. Method for adjusting chain tension: 1. Lift the main stand, use a wrench to loosen the axle nut counterclockwise; 2. Use a 12-size wrench to loosen the adjuster lock nut, adjust the adjuster until the tension is appropriate and ensure both sides have the same scale; 3. Tighten the adjuster lock nut and axle nut, and apply professional chain oil. A motorcycle is a two or three-wheeled vehicle driven by a gasoline engine, steered by handlebars for front-wheel direction, lightweight and agile, capable of rapid movement, widely used for patrol, passenger and cargo transport, and also serves as sports equipment.
Having ridden motorcycles for so many years, I know chain tension is quite particular. The standard is usually about 20 to 30 millimeters of vertical play at the midpoint of the chain. Too loose, and the chain can jump off, damaging the engine cover or even coming off while riding, which is extremely dangerous. Too tight, and the chain is under excessive tension, causing rapid wear on the engine bearings and making the ride more strenuous. My go-to method is simple: park on level ground, press down on the lowest point of the chain, and measure the gap with a ruler. If it exceeds 30 millimeters, it’s time to tighten it. Different bike models have slight variations—for instance, my cruiser prefers around 20 millimeters—but don’t generalize. Chains expand when hot and contract when cold, so always adjust after cooling down. After adjustment, take a test ride to ensure smooth operation. Weekly checks and lubrication can prolong chain life, saving you from costly repairs.
