The Jet Black M5 Pro is a high quality, magnetic resistance bicycle trainer. Magnetic resistance allows fine tuning of your training schedule through the combination of five levels of resistance adjustment and correct gear selection. Where a fluid trainer increases resistance according to the speed of the flywheel, a magnetic trainer can be overridden, making it suitable for recovery sessions, climbing and specifically tailored workouts. The internally cross-linked network of the 3-dimensional polyionic polymers forms the Jet Black Hydrogel Roller. It has a jelly-like feel that helps reduces tire wear by lowering the contact heat between the tire and roller and significantly reducing the slippage over conventional alloy rollers. The Quick Release has four available positions so that the trainer will suit Track bikes through to 12mm x 142mm (12x142 Trainer Axles required). The opposing side uses a threaded adjustment bolt with locking ring so you can perfectly set the lever tension. Key Features Fluid Resistance curve up to 475 watts. Hydrogel Roller for less noise and reduced tyre wear. Hydrolgel Roller reduces noise by 55%, and tyre wear by 25-30%. Jet Black SQR quick release system allows easy mounting and once set remembers your bike position. Set and forget Trainer is Pre-Assembled and ready to ride. Rock-solid design is stable for any size or style of rider and the most punishing of training sessions. Wheel Compatibility Suits road and mountain bike wheels between 700c, 29, 27. 5, 26 and many 24 wheels. Wide Base and Anti Slip Feet keep the trainer still for even the toughest of riders. Folds into Compact Shape for easy storage and transport. Lowest profile of any trainer. Trainers and Rollers Buying Guide