Just upgraded to 19" Bridgestone SO3's. Interestingly, the ride feels more firm/solid, and is NOT noisier than the stock 17" GY RS-A's (which had 6k miles). Actually seems quieter than the RS-A's on most roads, but a few rough stretches of asphalt or concrete may be louder - hard to say. Overall very happy with the SO3's - no evidence of tramlining as reported by some, but flat spotting, especially after more than a day of sitting, is definitely noticeable (goes away after 2 - 3 miles). Just thought I'd post my experience for all you good folks out there!

BTW, there's a very slight air leak at one point on the bead on one tire - looks like it loses about 1 psi/week. Worth trying to fix?

Thanks, John