ZERO-DRIVE ROLLERS [PORTABLE ZERO-RESISTANCE CYCLING ROLLER For riders looking for the classic feel of precision rollers, the Zero-Drive Rollers offer an adjustable wheelbase dimension and a stable platform for intense efforts. With 16" wide, 3.25" machined aluminum drums your workouts are as smooth as silk and quiet as a mouse. The powder-coated steel frame and zinc-plated hardware resists corrosion and folds in half for travel. Add a Floor Mat for the ideal indoor cycling workout setup. Precision 3.25"machined aluminum drums create a smooth ride 16" wide rollers provide ample space for natural movement Folds in half and stands upright for easy storage Suitable for indoor and outdoor use Powder coated frame with zinc plated hardware prevents corrosion Accommodates wheelbases 37.5" - 44" (95 - 112cm) At 17lbs (7.7kg) daily setup and storage is no problem Compact folded footprint of 31.5" x 20" x 5.25" (80.0cm x 50.8cm x 13.3cm) Accommodates wheel sizes 600c - 700c, 26"-29" Rider weight limit of 250lbs 3-Year Warranty