Heavy duty ball bearing chain tensioner for bicycle engine kits.
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It's better than the one that came with my conversion kit.
I thought I wanted another 4 bolt tensioner, even told the lady on live chat that most people would want the 4 bolt. I retract that statement. As soon as I pulled it out of the box I immediately noticed it was heavier and much better built. Not only that it is taller, which moves it forward on the bike, which makes for less of an angle on the chain. This causes less wear and tear on all of the components. I highly recommend this tensioner