Chain of Lies
A casual glance at your chain and sprockets may suggest that everything’s AOK in the final drive department. But a closer look could reveal hidden secrets about excessive wear that could be compromising performance and safety.
Here are four quick ways to know the truth about the condition of your bike’s final drive.
1. Bend and stretch
A length of new drive chain is flexible in one direction (to easily bend around sprockets) and stiff in the other direction (side-to-side). Pinch the bike’s chain in the middle of its run between sprockets and move it side-to-side across the bike. If it moves more than an inch or so, that’s a sign of chain link wear. After extensive use and abuse, the chain’s links also become elongated with wear, resulting in larger gaps between links. This makes the chain longer (what some call chain “stretch”). If you’re close to maxing out the adjusters to achieve proper chain tension, then you’re probably looking at a well-worn chain. And, while chain links stretch with wear, sprockets do not, resulting a misalignment of the chain’s links and the sprocket’s teeth. Try pulling the chain away from the teeth at the rear of the back sprocket. If you see separation, then the chain is toast
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