As long as you ride a bike, your transmission will gradually wear out until you need to replace some components, but do you know when to replace it?

When will the flywheel be replaced?

If the shape of the teeth changes, they will jump under strong pressure, which is a signal that your flywheel needs to be replaced, "said Chris McKenney of SRAM. Sometimes it is difficult to see the change in tooth shape unless it has reached the end of its lifespan, but everyone has experienced the jumping of teeth on a worn flywheel with a new chain, which is a well-known phenomenon

The simplest way to detect flywheel wear is to install a new chain. If the teeth jump when stepping on it, it means it's time to replace the flywheel. There are also some flywheel inspection tools on the market that are subjective to use, and they use the same principle as installing a new chain on an old flywheel. If the teeth jump, it means it needs to be replaced

When will the disc be replaced?

Tooth sensation and noise are the best ways to tell you that you need to replace the disc, "said Chris McKenney of SRAM. Unless the disc exceeds its lifespan, it is difficult to see the difference. During use, the disc will gradually become shaped like a shark fin

If a clean chain is sucked onto the disc (the chain is located at the bottom of the disc and does not release), then the inner disc (small disc) can be considered worn. If there is a tooth feeling or a change in speed or inconsistency, then the outer disc (large disc) can be considered worn. In addition, if you install a new chain and see light passing through between the disc teeth and the chain, they may also be worn.

You need to use a new chain when replacing the flywheel and discs.

Using worn chains on new flywheels and discs will accelerate wear, "Chris McKenney said. Chain is usually cheaper throughout the entire transmission component, so it is wise to replace the chain when using a new flywheel or disc. Generally, installing a new chain can confirm whether the old components are worn out

Brands usually do not provide data on how many kilometers to replace the flywheel or disc, so this requires consideration of many factors, such as the riding environment (rain, mud, ash...), whether the correct lubricating oil is used, maintenance intervals, and the driver's transmission habits. Therefore, you need to learn to judge for yourself when to replace transmission components, and I hope this article can help you.

(Source: road.cc Compilation: BX Jun)