Kailub Russell ran a 250F when he won the National Enduro series in 2015, but he’s been riding a 350 in the GNCC series for the past several years. However, during the off-season, the West Virginia rider decided to switch to a 250 for the GNCC series too. “When we’re testing, all the decisions we make are based on a stopwatch,” Tanner Harding, Kailub’s mechanic, says. “This winter, when we were in Florida testing, Kailub decided he would try a 250 against the 350, and it turned out he was faster on the 250. Yeah, there were spots where the 350 was faster, but overall, he turned faster lap times on the 250.