BV Mini Bike Pump Portable Frame Pump, Air Ball Pump Inflator with Ball Pump Needles, Fits Presta & Schrader- Smart Valve

First of all, this pump will promptly let all the air out of your tyre. It will then confuse you as to which configuration you should be using for the particular valve on your bike.You will then spend aeons experimenting with different combinations of unscrewing and lever placement.You may eventually - by forcing the pump onto the bike whilst pumping hard - be able to get some air into the tyre. Good, the bike will be at least rideable while you await the delivery of a pump which actually works.

Literally awful. Didn’t pump my bike tyres. Had to purchase a different one.

No way of switching between different valves took cap off to do so but unlike other pumps nib did not come our so I could use properly. Ordered different one instead

This pump does not "automatically fit presta and schrader valves" as claimed, so I had to return it.

Bought to use for a presta. I have a similar pump and know how to unscrew the grey cap, turn the rubber insert the other way and re insert and screw cap back on.By eck that was difficult. Screw it on too much, you won't fit the valve. The inside little pin for the other valve time damaged my Prestatyn valve so I had to break the little yellow pin out of it. I assumed it turns to lock for one valve type but just broke.And when I did get it on my valve, it was leaking more out than putting in. It's simply not adequate for fat mountain bike tyres.