Feedback Omnium Trainer Much like their work stands we all know and love, Feeback Sport's Omnium Portable Trainer is an exceptional method of pre-race warmup and resistance training in a compact, portable bundle. Merging the functionality of a fluid trainer with the convenience and simplicity of rollers, the Omnium employs an easy fork-mount design that eliminates the need to remove the rear wheel, while its ingenious Internal Progressive Resistance (IPR) system uses magnets that move to produce a higher resistance as you pedal faster, creating a real-road feel with virtually zero noise. Optimized for 700c road bikes, 29er, 26" and 650b mountain bikes, the wheelbase and height are easily adjusted, while the fork mount is compatible with standard quick release, 15mm and 12mm front axles, and can also fit 110mm width axles. The resistance drum innards are completely greased and sealed, requiring absolutely zero maintenance. Upon setting up, the Omnium simply unfolds and doesn't require any maintenance. Once race day has concluded, it's just as easy to fold back up and stuff into its included heavy-duty carrying bag, making transport an effortless affair. Features:Progressive magnetic resistance No assembly requirede 1/4C simply unfold and mount bike Bearings are greased and sealed, requiring no maintenance Includes heavy-duty tote bag for transport and storage Specifications:Total weight: 13. 2 lbs. (6. 21 kg)Folded dimensions: 25. 75? x 7. 25? x 8?(66 cm x 18 cm x 20 cm)Accepts forks w/ standard QR, 12 x 100, 15 x 100 & 15 x 110 (boost) thru axles Accommodates wheel sizes 600c e 1/4C 700c, 26?-29?Aluminum drums: 4. 0? diameter, double-wall design Rider weight limit: 225 lbs. (102kg)Wheel base from 840mm to 1200mm | Feedback Sports | Omnium Over-Drive Trainer With Tote Bag