I suppose its possible to go to a garage station and use their compressor and a good gauge. I think the fax will take up to 300psi but that might depend on the model. I doubt that service station pumps go that high. Most foot pumps will go high enough for light air pressures like 150 range but it might get tough to get there. There is much less volume in a rear shock that it might only take a few short strokes to get the pressure up. Bikes are suposed to come with a pump if they have a Fox air shock. They shouldn't be that expensive and they do work very well. Beware that the calibration can be off by a fair bit from pump to pump. I have two pumps. One came with my shock, the other with my fork. One reads 100 for the fork and 80 for the rear but if I use the other to get the same ride the fork needs to be at 115 and the shock at 95. My buddy weighs about 30 pounds more than I do and on the same bike, Superlight, his pump requires only 85 psi to get similar sag to me.
You need a shock pump to get the high pressure and not have to measure sag all over every time you bleed the air. The guages may not be very accurate in terms of actual PSI, but they should read the same every time you reinflate anyway.
The performance shock pump is $24.99 right now, but if you have a 20% off coupon it would be cheaper. It's exactly the same as the fox model. It's also exactly the same as the $19.95 Nashbar pump, which is on sale from $25. I don't think you will find one any cheaper unless you watch ebay and classifieds.
The gas station compressor might work, but be really careful about not going past 300psi or you could ruin your shock. Does your LBS have one you can borrow?
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