The chain spy can be installed in minutes and is easily adjusted over a 1x chainring. The shims are robust and the arm linking the chain spy to the collar does not flex. This would fit over any size chainring I could add but other seatpost tubes may differ.
Works well, just carry a allen wrench because it can come loose every now and then. I have an E-bike that goes 44mph and this really helps keep the chain from coming off while riding. It has a single 52 thooth chainring. It has made the bike safer.
PROS: Lightweight, Easy To Install, Attractive Design, Durable
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