Aluminum Presta to Schrader Converter Car Valve Adapter Bicycle Bike Tube Pump Air Compressor Tools (Yellow)...

I ordered these to be part of my bike kits for those times when you need to be compatible with the air pump device. I tried these at home with my standard pump and they work fine. It was a good and inexpensive choice on my part. I have since had several occasions to use these and found that they work on some Presta valves but not all as the stems are slightly different due to different tube manufacturers. This slight difference impacts the ability to use certain air pumps.

Works. Bought a new bike that came with Presta valves. First time in 100 or so years of riding that I had Prestas. So far, they worked fine when pumping up tires with a compressor

Material: Zinc Alloy ( Copper Plated ) Size:Approx.1.5cm x 0.9cm x0.7cm.(L*Big head diameter*Small head diameter) Convert a Presta valve to a Schrader valve Also turn a UK valve into a US valve Worked perfectly and are well made.

My tubeless 29er goes flat after a few weeks if I don't pay attention, then I'm normally a bit out of luck as you need a high pressure compressor to refill a flat tubeless tire. The problem? The gas station doesn't do presta! Old solution? Spend $50 at bike shop to get my tires filled with a bit more sealant and refilled with their shop air compressor! Terrible waste of money!!! Now I just jam 2 of these suckers on, squirt in a little bit more sealant in the new hole (prestas aren't nice about access for sealant either!), put my bike on my bike rack, drive down to the gas station, use the air hose there...and after a little bit of waiting - POP! The tires seal up against the rim nice and flush and they're ready to go. They look beautiful too. Not sure if I'll ever take them off.

served its function