cbr shadow wrote:I have a crit tomorrow morning and it's likely to be wet , light rain. My crit bike has GP4000sii tires that are pretty worn out. I have a new set of tires ready to go, but I'm wondering if it's a bad idea for brand new tires on wet tarmac for a crit. Do they need to be "scuffed" a bit or "broken in" before they're grippy, or should they be good to go right away?
Option A) Put new tires on the bike and ride it. It'll be grippy
Option B) Keep using your worn out tires for 1 more crit (~20 miles) and change them after. You'll get more grip this way.
Tires are pretty gummy out of the box, I wouldn't be worried about grip. My bigger concern would be mounting new tires and possibly not getting the tube in there quite right and having a pinch flat. . . but assuming you have wheels in the pit, it's not a big deal.