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Old 12-30-07, 02:13 AM   #1
adamg
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Low vs high pressure shock pump

I use an old Marzocchi '03' EXR Air fork (which I find good for a basic fork) and am looking for a pump. I know a high pressure pump will work but am I much better off getting a low pressure pump? A genuine Marzocchi low pressure pump is of course relatively expensive.

Are low pressure forks more sensitive to minor pressure adjustments. Thanks
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Old 12-30-07, 12:05 PM   #2
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Assuming the same quality, a low presure pump will be more accurate. But only because the you have finer graduations on the scale.
Low pressure forks might be considered more sensitive because it takes a smaller change in psi to make a difference. Al ot of them also have a coil spring that reduces the effect of small pressure changes.
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Old 12-30-07, 12:18 PM   #3
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+1 to what Rev. Chuck said. I aired up a Marzocchi fork for a friend the other day with a high pressure shock pump, and was amazed at how big a difference very small changes in pressure made. It was difficult to measure very accurately, in fact, because the pump really wasn't intended for such low pressure applications. Whatever you get, I'd get a pump intended for lower pressure applications.

I wonder if a regular tire pump would work. The pressure I put in the Marzocchi fork I aired up was something like 30 or 35 psi I think, it's a schraeder valve; wouldn't a regular pump work for that, assuming you could get to the valve with the pump head and attach it?

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Old 12-30-07, 03:58 PM   #4
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you could buy a high pressure pump and swap out the guage for something that was meant for lower pressures. guages can be found pretty cheap
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Old 12-30-07, 05:23 PM   #5
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Originally Posted by well biked View Post
+1 to what Rev. Chuck said. I aired up a Marzocchi fork for a friend the other day with a high pressure shock pump, and was amazed at how big a difference very small changes in pressure made. It was difficult to measure very accurately, in fact, because the pump really wasn't intended for such low pressure applications. Whatever you get, I'd get a pump intended for lower pressure applications.

I wonder if a regular tire pump would work. The pressure I put in the Marzocchi fork I aired up was something like 30 or 35 psi I think, it's a schraeder valve; wouldn't a regular pump work for that, assuming you could get to the valve with the pump head and attach it?
You would have a hard time with a floor pump. The coupling is not designed for zero air loss and the pump volume is so big it would be hard to be precise. You would have to pump up to pressure because there is no bleed valve.
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