So I will be picking up my 08 next week, and surprisingly the forecast is for rain until June (shocking, I know). I have a buddy that tells me that i absolutely do not want to ride home with new tires in the rain. I have ridden plenty in the rain (this IS Seattle after all) but never with new tires. Does anyone have an opinion on this? Should I wait until it dries out a bit or go borrow my buddies trailer?
My only advice would be to take it easy. Gentle throttle, gentle braking, no aggressive leans in corners. Give the tyres a good 100 miles before fully trusting them, wet or dry.
And a little rain just after a period of dry gives a much more slippery surface than after any amount of heavy rain.
The first half hour of any rain is the worst, it has to wash off a layer of grease and dust.
After that, you've about 80% grip unless you go through standing water at above about 50 mph. I've ridden at 40mph plus through 6 inches of standing water without any problem (I knew the road surface underneath was good).
[edit]Also treat painted lines, ironworks and tar snakes as if they were ice; when you go over them make sure the bike is upright and you're not braking or accelerating.[/edit]
I've also turned off a main road onto a minor one just after rain started, changed into 2nd, and thought I'd got total clutch slip, only to realise that the back wheel was starting to go sideways and had simply spun up (this on my previous mount).
So, ride in the rain, but if in any doubt, wait 30 minutes after it starts to give the road surface time to clean.
Just my 2p's worth.