Using the Cyclops Classic Aluminium Rollers will not only get you fitter but will improve your bike handling skills & pedalling action at the same time. On the Classic Rollers you have to pedal smoothly 100% of the time & balance the bike & keep it in a straight line while you do it. Mastering the rollers will translate to more efficiency, power & technique on the road. Features Aluminum roller drums run silent & smooth. Precision-lathed 3.25" aluminum roller drums wont distort in heat or sunlight. Fold flat or stand on end for convenient storage. Designed for both indoor & outdoor use. 16" wide wheel base fits just about any size of bike & allows plenty of room to move around. Rubber foot pads ensure that the only thing moving on the rollers are the drums for a secure, sturdy ride. Durable steel-frame construction. Adjustable belt for right & left dismount. Available with unique patent-pending, 5-level adjustable resistance. Resistance Roller features 5-levels of adjustable resistance. Resistance Roller uses zero moving parts to deliver quiet magnetic resistance. Maximum wheelbase 44.5" (axle to axle) Minimum wheelbase 37.5" (axle to axle)