"Almost as bad as oil threads..." If you have threads in your oil, something is badly wrong, and it has nothing to do with your tires. On the tire thang, rain grooves suck for any tire, and rain grooves on the SF Bay Bridge mean you (I) have a wicked cross wind at the same time. I have the new (I think) stock Road Riders and not the grooved Speed/Skid/Death Masters that started this conversation. Still a big wobble. I think half of it was the wind, the other half was the groove/tire combination, and the third half that my Bay Bridge two-wheeled commutes in the past were on a Moto-Guzzi Ambassador. She was much, much, heavier. (RIP dear old friend). I'm diggin' my new ride, but need to learn the bridge on a lighter bike.