60 yo male. The last year and a half, I have battled varying levels of back pain while cycling. SI joint. I have had a bike fit and 2 separate bikes. The result is the same. This pain only occurs while cycling. Sore afterward, but goes away. What adds a little interest, is the fact I can put in a good hard hour in spinning class and no such pain. Besides the obvious difference between the two activities, my setup on the spinning bike has the handlebar area much higher than the bike. My current bike is a Volagi. The previous was a Roubaix. Thoughts?