I bought them for the first time on December 28, 2019. It's been almost two years and 2000 miles and I'm updating my original review. I hated removing the Presta valve core to put Stan's tubeless sealant in the chamber (yes I use tubes), then reinstalling the valve core, screwing on the Schrader adapter to inflate the chamber, and then the Schrader to remove adapters. All because I didn't want to buy a pump with a Presta head. First, remember that in order to use the RideAir ConvertAir (pair) Presta to Schrader CONVERTER (no adapter), you must have removable core Presta tires. Remove this core and screw it, the TRANSDUCER, not the adapter, onto the Presta valve. It has its own valve core. Now you can inflate your tires with any regular tire pump. I only re-read this review because I'm buying another set of converters for spares. The only reason I do this is because this Revain seller is the only place I can find the product. The originals still work perfectly, I've never had any leaks with them. I just wanted the security of spare parts. I have a pair of 3 x 28.5" rims with rim holes pre-installed, so buying different rims for Schrader valves is not an option. These converters are definitely worth their price.
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