|  Author | Topic: Fork pressure loss (Read 119 times) |
Mark Y
Hammer Head
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Posts: 196
Karma: 4 |  | Fork pressure loss
« Thread Started on Aug 28, 2009, 10:44pm » | |
The last time I rode I noticed I was getting a "knock" in the front suspension sometimes on hard dips,etc. I thought maybe the fork was bottoming out. I acquired another bike and today when I was showing my son the ins and outs on the old one we adjusted the fork to his weight. The pressure was WAY low.(50%-60%) travel with him static in normal riding position. We pumped it back up to maybe 30% travel, but I'm concerned about the initial pressure loss. Is it normal for pressure to bleed off over time like tires do? If so, what is normal; i.e., how often should one check the pressure/travel? If it isn't normal, is it a big deal to replace seals or valve?
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azdrawdy
'Rhoid Buffing
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Location: North Augusta
Karma: 11 | | Re: Fork pressure loss
« Reply #1 on Aug 29, 2009, 7:48am » | |
I have had many, many forks and shocks over the years but have never had one lose air pressure. I have had several rebuilt, and have also sent some off for rebuild (either to Fox or PUSH). My rebuilds were always due to stiction or excessive oil seepage.
I typically check my air pressure weekly. I also have my base pressures written down for quick reference. I may even run different pressures on different trails, as there's a big difference between Lick Fork and Bartram. You always lose a tad when attaching the small pump, and topping off after checking it is required.
All that said, the local expert around these parts is ted/Todd. If you have today off, and have the time, drop by Chain Reaction and talk to him about it.
MD
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"Falling is okay. What's not good is not knowing why you fell. Don't waste a perfectly good fall or you'll just have to do it again. Treat it as a physics lesson." Tom Hillard, mtb coach |
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dgaddis1
'Rhoid Buffing
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Joined: Jul 2007
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Posts: 845
Karma: 16 | | Re: Fork pressure loss
« Reply #2 on Aug 29, 2009, 9:51pm » | |
Both of my shocks lose air over time. I check them every month or so.
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bontrager83
Fred
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Joined: Dec 2009
Gender: Male
Posts: 2
Karma: 0 | | Re: Fork pressure loss
« Reply #3 on Dec 4, 2009, 5:32am » | |
if you loose more than 20% in a week, it's most likely time for a rebuild, I suggest B Rose at the Shockspital. He is a grass roots guy, all he does is Forks and Brakes, and is very good.
www.shockspital.com
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