 Razor chain tensioner for the Razor E90 & E100 electric scooter. This chain tensioner is a Razor OEM part for the E90. The chain tensioner for the E90 is an important part for the chain to run smoothly. It should be replaced if you lose the spring, or need to replace a faulty unit. A faulty chain tensioner can be identified by a loose chain that falls off during ride time.
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