Typically, if you want to run a single-speed setup on a bike with vertical dropouts, you are going to need a chain tensioner of some kind. Since you can't adjust the chainstay length of the bicycle, your single speed chain is probably going to have some slack in it. Leaving the slack in the chain can cause it to fall off while you are riding which can cause you to crash. The best thing to do is play it safe and throw a chain tensioner on your bike.
Not for use with fixed-gear drivetrains or coaster brakes
The design of this product is great. It can handle a 14t cog. The downfall of this product is the pulleys have lot of side play and the mounting bolt has looseness in it as well. I believe that most chain tensioner today are not as sturdy as they should. When I got this product it was not greased.
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