In our opinion these should be supplied under the seat of any motorcycle sold, that doesn't have angled tyre valves as standard. How many times have you fought with an air line in a garage trying to get it on the valve and ended up ruining the threads on your tyre valve? We discovered this product a few years ago and have one under the seat of all our bikes, just in case. You shouldn't leave them on the valve permanently as that will unbalance your wheel, but they are a God send! You need to remove them swiftly as they will let out a tiny amount of air as they come on and off. We usually put an extra pound or two in to compensate.