Advice: inflating wheelchair tyres

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A recently wheelchair-using friend is finding that a bicycle pump doesn't seem to fit her wheelchair tyres, and they are slowly getting flatter and flatter. She mentions that she once had the tyres inflated from the compressed air at a garage, but I know that if I take the chair to a garage they will have no idea what to do or whether I'm in danger of blowing the tyres up. Does anyone have any advice? Thanks!

Comments

[http://users.livejournal.com/_nicolai_/]

One can get foot pumps that will inflate car tyres, with appropriate connectors.
However, of the ones I've used, the gauges have been very inaccurate, so a separate gauge would be required to inflate them to the correct pressure.
Clearly you need to know what pressure to inflate the tyre to. If you take it to a car garage, most of them these days have tyre-inflation machines where you set it to the desired pressure, apply the nozzle to the tyre valve and the machine chugs away and goes BEEP BEEP when it's done. If it's anything like a bicycle tyre, Michelin suggest pressures around 6 bar for street riding.
I expect the tyre will have a maximum pressure rating written around the side, do not exceed this.