I could swear 06 went to the 1-1/8" pulley to allow for a 150 tire. At least the street glide did, not sure about the E-glide. However, I just put a 150 on my 03 and it's barely touching the lower belt guard. My plan is to trim the guard a little bit to give it the clearance needed. Like I said, it barely touches and I could probably ride it as is, but I just don't want some annoying squeak or squeal. I put a Avon Cobra on it and one manufacturers 150 WILL measure different than anothers. I was running a Michelin Commander MU85 which is a 140. Stock was a 130 for 03 and as you can see, I've been able to go wider. The key is to watch the clearances carefully.