Regardless of the weather outside, you can stay in shape with your own bike! The Kinetic Cyclone Bicycle Trainer offers wind resistance at its finest. It offers effective indoor training in a stiff, well supported frame - at a reasonable cost. Fine-tune to your wheel and tire size with the micro-adjust knob. Braking suddenly will cause wear and tear to the rear tire.Always do warm-up training before starting your training. Details: - Precision-machined roller to reduce tire wear.- Offers effective and convenient indoor training at a reasonable cost.- Fold-able for travel or storage. Heavy duty steel frame.- Can hook up to just about any bike-including road and mountain bikes with a 26", 27", or 700c wheel.- The Trainer is built with a sturdy frame, allowing for safe and secure cycling.- Wind resistance, great for the beginning bike trainer. Technical Specs: - Net Weight :19.85 lbs- Dimensions: 22"(L)"19"(W)"15"(H)- Frame width :2.2"- After frame width :1.2"- Screw diameter :19.5mm(See the pic )- Adjust the height with the big screws, to change the wheel friction.