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I bought a couple of these and used them on my mountain bike and road bike. The one on the mountain bike worked pretty well up to about 50PSI. The one on the road tyre started leaking quite a bit of air after about 60PSI and really struggled to get to 100PSI. Overall, the adaptor seems to work very well up to a certain pressure but not very well at high pressures. Good for mountain bikes not so good for high pressure tyres. But saying that for 50p its amazing value.