This trainer has been taken out of it's original packaging and assembled once. It is still in like new condition and covered under full manufacturer warranty. World exclusive rim drive system Magnetic resistance unit 800 gram machined flywheel Ergo type frame The standard tire drive system trainer must contact the tire surface and it will cause heavy noise and vibration when using a MTB's knobby tire.It's very uncomfortable for both the user and neighbors. The only one effe
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