I have a used Elite Tuo Trainer that is for inside bicycle training with a Smart Trainer App. When it's too hot outside, this trainer is an excellent way to get training time in. It uses Bluetooth technology to work with several training software apps. I have the power connector and the trainer. This trainer works with tires less than 28", there are adaptive parts for larger tires, so it can be used with them, I just don't have those adaptive parts--which must be purchased separately. (Professionals recommend using a specialized training tire when using this trainer.) When these trainers first came out, they were being sold for $580. This trainer is made for serious bike riders: to initialize the Tuo Training App, the bike (attached to the trainer) needs to be ridden at approximately 30mph for ten minutes. The price has come down to around $340 at most places. I'm willing to meet at an agreed upon public place to sell this item.