Sole TT8 vs F85: What works? This review will compare the F85 and TT8 treadmills by Sole Fitness. The Sole F85 treadmills and the Sole TT8 treadmills both have a 4.0 CHP motor. Both treadmills have the same running area, measuring 22'' X 60''. Both are 2 inches wider than industry standards. The TT8's decline feature is a significant plus, as the F85 can only … [Read more...] about Sole TT8 vs F85: What works? [Comparison and Reviews] 2023