This might be a question for a vintage club. But here goes anyhow, a little background.
I've got an 86VFR750F that I'm recently now just using as a track bike. Yeah, yeah, I know, it's old. But so am I, so we just work well together.
Obviously I realized that the stock pre-radial tire rim sizes just wouldn't cut it, so I pulled them off and threw on a set of 17" wheels. A 3.5" front off an early 90's F2, and a 5" rear off a mid 90's F3. Some machining was required, but nothing beyond my capabilities. I'll find a couple photos to post.
I took the bike to the track last year for the first time. The Ridge Motorsport Park in Washington state. Two thumbs up!!!
I'm running a 120/70 up front and a 170/60 out back. Dunlop Q2's. Love the tires! After a bit I'm now running in the mid-to-quicker intermediate pack and having a blast. It's kind of fun running the old girl past all the newer iron on the track. I know, I know, it's not racing, just track days.
Anyways, to finally get to my point, I've noticed now that the Q2 is being replaced by the Q3 that the 170 rear size has been dropped. Only a 160 or 180 and bigger are offered. The 170 fits my 5" rim really well, and still clears my swing arm and chain. I cannot go to a 180 since I think it will be too wide, and anyway it would be too wide for a 5" wheel I believe. And I'd rather not go down to a 160, as I'd like to keep as much rubber on the road as possible, if for no other reason than to maintain confidence. But I really want to stick with the Dunlops, they are very confidence inspiring, and I imagine I'll like the Q3's even more.
Any thoughts on what I should do? Besides going out and buying something more modern . I really want to stick with a 170 out back if possible.
Thanks guys