The Challenger features 4.5" diameter and 15" wide aluminum drum tubes with black polycarbonate end caps, for the cost concious riders who values the smooth ride and less resistance of the larger drums. A black epoxy powder coated frame and orange belt round out the Challenger 4.5. Old pros know that rollers are a great way to develope a glass-smooth pedal stroke and build your athetic ability with the bike.
After a couple years of use a drum failed. It is great to have a lifetime warranty,but the service is slow For the money I should have purchased the Cycle-Ops rolles.Cycle-Ops has the best customer service Excel sports could have pushed the repair sooner.