The issue with that setup, other than the way it looks, is that if it is still using the wheel that came in the kit, it needs a MUCH better one, made out of super strong material and with motorcycle grade bearings. I have seen skateboard wheels used for rollers, and they should work. But for $35, I don't see the sense in rigging something even if it does work. That is only a tiny fraction of a good build. Seems like many motorized bike builders seem stuck on being cheap. I mean SUPER cheap, as in how can they save a couple of bucks. They look for the cheapest engine kits and use Walmart bikes. A well built motorized bike is still cheap, and for a little bit more than the absolute cheapest thing you can find, you can build a bike that not only won't fall apart on you, but won't get you killed either. If you are willing to pay for a proper rear sprocket mount, I don't see the issue with spending $35 on a proper tensioner. Those two things are the major weak points on all Chinese engine kits.