csb – Member

Truly crap. Maybe I'm thick but it's a double header (schraeder/presta) that just shoots air out of the side you're not using!

Have you locked it on? usually on double header pumps, locking it closes the unused side

On my cheapo track pump the valve inside seems to switch to whichever hole it sees the highest back pressure at.

So sometimes if I try it on a fully flat tube there is no pressure difference so it stays on whichever hole I used last, which might not necessarily be the right one.

When that happens I just put the end in my mouth and blow into whichever hole I want to use, while giving it a wee pump and it switches.

Mine turned up in the post today. I'm surprised at how narrow they are for a 2.1". 49.5mm across the carcass and 53.5 across the tread on a 317 at 40 psi. Narrower than the Specialized 2.0" that are coming off.

Anyone else find this?