The Omnium Portable Bike Trainer by Feedback Sports will keep you peddling come rain or shine. This simple fork-mount design is optimized for pre-race warm-up, travel, and those days when life (or the weather) gets in the way of your ride. The Omnium trainer utilizes Internal Progressive Resistance (IPR), delivering a real-road feel with minimal noise. It has 4 inch diameter, double-wall design aluminum drums, and the adjustable wheelbase and fork mount allow for various bicycles (road, MTB, Cx). It accepts forks with standard QR, 12 x 100, 15 x 100 & 15 x 110 (boost) thru axles, and accommodates wheel sizes 26 - 29 inches (600c - 700c). It has a rider weight limit of 225 lbs., and has a 3 year warranty. There are no tools required to assemble or store it, simply unfold and fold, and it comes with a heavy-duty tote bag for transport and storage. The Feedback Sports Feedback Sports Omnium Portable Bike Trainer w/Tote Bag - Omnium Portable Bike Trainer will make sure you never miss a workout.