AstroAI Brass Presta Valve Adapter, Convert Presta to Schrader Valve Adaptor for Bikes, Inflate Tire by Standard Pump or Air Compressor (4 Pack)

Bike tire adaptor

Worked perfectly for my fiancé bike. Was able to put air in the tires with these adapters with no problem

Work very well at a reasonable cost.

Worked very well for me. I bought these because one two occasions I've had valves pullout of the stems on the new style Schwalbe tubes when I attempted to remove my pump. Those tubes are, round numbers, $30 a pop but these adopters have so far worked very well in airing up and have resolved the issue. Excellent price too!