GIYO Mini Bike Pump for Road Bikes – Presta Valve, 120 PSI CNC Telescopic Barrel, Lightweight & Portable, Secure Valve Lock, Taiwan-Made (GM04)

I usually consider these things like the scissor jack that comes with the donut in your car. As in, it'll work in a pinch but it's not ideal. This little guy changed my mind. If it had a built in pressure gauge it would literally be ideal for me. Solid attachment, remarkable volume of air transferred and it's the size of a chip tip marker. Well done.

The pump works fine. Yes, it takes an inordinate number of strokes to inflate a tire. Because it is a Small Pump. Basic physics tradeoff. I'm happy that it grips a Presta valve well. A fine pump to go in your saddle bag. It fits. It pumps. It pumps past 80 PSI easily. It gets you out of an infrequent jamb at the cost of some time spent pumping. Price is right. Recommended.

Small enough to keep in my saddle bag and delivers enough air to inflate a tire to get home. I have not tried to get 100psi or anything like that out of the pump. The Presta valve lever lock works well and doesn't break fingers to use.

Good backup pump when you're out of CO2 cartridges.- Moves a lot of air for its size, just don't expect floor pump performance.- Clamps onto the valve well (tested with presta on a road bike).- Fits easily into a seat-pack or pocket.Has saved the day for both myself and for friends who didnt bring enough CO2. Getting 100psi into a tire with this will be hard work, but easy enough to get the 60-70psi to get you home without pinch-flatting.Be sure to keep dry (eg in a zip-loc bag) so you don't find your pump is rusted that one time you are 50 miles from home and fixing your third puncture of the day. Haven't seen any rust in the year I've had this pump, but a previous (different) mini pump had this issue, so better safe than sorry.

Just wat I was looking for as a back-up to using CO2 cartridges on the road. I like to be overly prepared and this small pump that fits perfectly next to my water bottle cage will work perfectly. Nice small size yet the expanding pump handle allows for some more efficient pumping than my last mini-pump. This is not a pump to be used as a daily toll but an emergency on the road tool. It is built well and helpful that it has a locking lever to make sure the connection to the valve is secure. I expect to purchase again as a gift.

I realized after I ordered this that I needed a new pump for both presta and Schrader valves. It was too late to cancel. However , I've decided to keep this one because it work well, works quickly, and is a nice compact size.

Took forever to get any pressure in my tire, which I suppose should be expected given it's tiny size. I was really looking forward to having such a portable pump with me. Unfortunately I was planning on going for a ride today and found out I had a flat. What a perfect opportunity to try out this new pump I thought...Well immediately it let out the little air I had left in my tire, leaving even more for me to pump. After what felt like an eternity, I figured it was close enough to put the cap back on..... Unfortunately that requires me to be able to remove the pump first. I spent about 5 minutes wrenching at the tire trying to remove the pump. I eventually gave up one retaining any air as some kept escaping as I tried to pull the pump off. I disassembled the pump and was able to remove the very end by effectively unscrewing it from my valve stem.After all the effort of pumping and trying to remove the pump, I had pump the tire back up with my full sized pump.

They claim you can use this micro-pump to inflate up to 120psi. That is a complete joke. UNTRUE. It's great for slightly inflating a tube before installing, and then pumping up the tire to about 50psi before using a CO2 cartridge. If you only have this pump, you *can* work yourself to death and pump literally about 400 pumps to get it up to 70psi; just enough to get you home.So -- it's very useful, but DON'T believe the hype. Zero chance you can get up to 120psi; not even 85psi!