| As Tetol says the ACU requires that you have to 25mm holes that are plugged for dry races and open for wet races and there one heck of a lot of wet races at club meetings even when its bone dry, if the clouds are threatening rain then the wet race board goes out which means they don't have to stop and restart the race if it rains.
Normally you have one hole at the front and one at the rear to get rid of water under both acceleration and braking.
The support vans in the paddock such as A&R racing carry spare grommets for plugging 25mm holes if you happen to loose yours although I have used tank tape before now, with one end folded over on it self to form a tag, this makes it easy to remove in the collecting area if need be while holding the bike up with one hand. |