[LuvDog]

My 2 cents...

I went from a 190 Dunlop to a 190 Michelin PP... and the turn in was noticeably quicker. Even with the same width.

Why?

Probably a lot of reasons...

1. Different profile from different manufacturer
2. Different profile from a different "type" of tire... I think the PP has a more aggressive profile than other tires.
3. The old tire was just worn out.

Do I think a 180 would turn in any better... not necessarily. Especially since I have a 6" rim on that bike.

If it were a 5.5" rim, then that would be a different story, since most 190s weren't made to put on a 5.5" rim.

Also... I think the 180 on a 6" rim isn't quite as effective as it would be on a 5.5" rim.