Hi guys, new member here. I have a "Teromas" brand portable air compressor I ordered on eBay. It has three settings: psi, bar and Kg/cm2. I like it because it has an adapter to use on a home outlet (110 v) as well as a 12v DC adapter to use in your car's cigarette lighter. I've been weary about using one of these things in the car's cigarette lighter after I blew a car fuse out using another portable air compressor several years ago.

Anyway, I have an old 1974 Schwinn Continental. I bought new tires for it a couple of years ago and the guy at the bike shop said the recommended tire pressure was 90 psi. When I tried to use the psi setting on the compressor, the tire became really full when the digital readout was nowhere near that. I was afraid I'd blow out a tube, so I unplugged it. Then I tried using the bar setting. According to a conversion chart I found, the correct bar setting to use for 90 psi is 6.21. However the lowest bar setting possible on the compressor is 10.00!

Any thoughts? Is there any way to use this without using the old "that feels about right" thumb method on the tire? Maybe this compressor is geared more toward auto tires than bike tires.