You know you can tune the QSC for the bigger tires so you dont lose the pulling power... right?I did notice the power had faded a bit from the tires overall size. I ordered the QSC/STM Combo from QSC yesterday and am really looking forward to getting it installed. I smoked my belt just before the race and didn't have a replacement. I ordered a new belt from my dealer and when I put the new belt on last weekend I noticed the the primary and secondary looked to be slightly off of alignment. It didn't matter because I knew I was going to replace them anyway. Give me a few hours and I will post the pics up.