I have been running 14/50 on my 2007 with good results...Then again anything lower than the ridiculous 15/45 land speed record cearing that it came with stock would have been better. But...I ride some technical stuff and lately I have been in 1st gear way too often. I dont like riding in 1st gear...Makes me feel slow and lame and I catch nuetral on occasion when I upshift. I want to turn my bike into a 2nd and 3rd gear tractor. Anyone running a 13/50 combo on thier late model 525 EXC's??? If so how did it work and did it help to keep you out of 1st gear in the slow technical stuff? Thanks!