It usually takes little thought to get the chain tension right. This little tool removes every thought that was needed. It's so quick and easy to use - it only takes 30 seconds to take multiple readings so I always know if my sag is within spec. It's small enough to stay on my bike. I really should have bought this many years ago. This is really cheap insurance that ensures you get the most out of your chain and sprockets (except keeping your chain clean π€)
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