Review on Beto Bike Tire/Shock Pump MTB, 300psi High Pressure - Rear Shock & Suspension Fork, Mountain Bike/Motorcycle - Schrader & Presta Valve Adapter - Dial-Gauge, Bleed Valve, Mounting Bracket by Daniel Russell

For using Schrader valves this works very well. However, all of my bikes use Presta valves and the small piece of brass in the pump that pushes the air valve is not long enough to push the Presta valve to let in air or even read the pump pressure. I tried both front and rear, neither tire worked. I tried tightening the adapter with pliers and it still didn't work. I may have a lemon, but this pump isn't working for me. But then again, if you only use Schrader valves or are looking for a tiny pump to keep in your roadside emergency kit in case your tires go flat, this is great for that!