When you add Saris rollers into your training routine, you'll increase your balance, control and ability to ride a straight line - all of which translate to more efficiency, power and technique on the road. Features: Aluminum roller drums run silent and smooth Precision-lathed 3.25" aluminum roller drums won't distort in heat or sunlight Durable steel-frame construction Designed for both indoor and outdoor use Rubber foot pads ensure that the only thing moving on the rollers are the drums for a secure, sturdy ride Adjustable belt for right and left dismount 16" wide wheel base fits just about any size of bike and allows plenty of room to move around Specifications: Maximum Wheelbase: 44.5" (Axle to Axle) Minimum Wheelbase: 37.5" (Axle to Axle) Compatible Wheel Sizes: 600c - 700c, 26" - 29"