Roller System

A major component in providing no hesitation walking/running and long treadbelt life is the roller system. In design, there is no substitute for size. Basically, the larger the better. That's why commercial treadmills will oversize the roller design with very large diameters.

Large rollers can offer the following advantages:

Treadbellts can run with less tension. Less tension results in longer life to both the belt and roller bearings. This is because the larger roller diameter has more area to "grip" the belt (traction) and prevent slippage.

Large rollers turn more slowly at all speeds. This obviously reduces bearing wear. The Smooth 9.1 rollers operate 43% slower than True or Precor treadmills.

Increased load capacity bearings are standard with Smooth 9.1 roller design. Small rollers mean small bearings. Large bearings in rollers mean large load capacity, upt to 40% more! This adds longer life.

Treadbelt doesn't have to bend as sharp as it is forced over larger rollers. Support fibers (polyester) in the belt will last longer by staying cooler and not flexing as much. The more flex, the more heat, especially on a very tight belt (necessary to prevent slippage) with units using small rollers.

Larger rollers have more surface mass to absorb treadmill belt heat. Treadbelts can run hot! The cooler they operate, the better. The backing lasts longer, the splice is stronger and the PVC top coat doesn't "migrate" (bleed through) to the deck (causing friction).

Better precision bearing alignment is maintained. Because with large roller size, you also get much more strength. Larger axles (bigger bearings) are also stronger to minimize flexing between the mounting points of the roller. The Smooth 9.1 axles are usually 18% larger.

You can't purchase better quality at this price range.