You're already a proud owner of the Omnium Over-Drive Bike Trainer, but today you're looking for a resistance-free, simple and effective spin session. Designed to be lightweight and portable, the Omnium Zero Resistance Sled is adaptable to whatever bike you ride and whatever workout you're targeting - let the Zero-Drive Sled be your next training accessory. - Precision machined 4.25" aluminum rollers create a smooth and quiet ride - Dynamic, free-floating rear wheel design promotes the most realistic, road-like riding experience - Adaptable to virtually any bike (up to 1348mm wheelbase with optional extender) - No tools required to assemble or store -- simply unfold for use and fold for storage and travel - Maintenance-free resistance unit and roller bearings - 3-Year Warranty