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So how accurate do you think youre shock pump is?
I've currently got 4 shock pumps
One is 2 years old the other 3 less than one year old
One fox pump, one rockshox pump and one Halfords pump, these 3 look to be identical apart from the branding
The fourth pump is a wiggle lifeline pump
So the Halfords and fox pump read 230 psi when connected to my Fox X2 shock
The rockshox pump reads 270 and the lifeline reads 280
Even with allowing for 5 psi diffence as the shock air fills the pump when connecting each pump that's a big difference
Currently using the lifeline pump as I'm running 270 psi and that feels about right as that's what TFTuned set the shock at
If I were to use the fox or Halfords one at 270 that could mean I may actually have 310 psi in the shock and 300 psi is the max
Any ideas why they would read so differently?
A 10 psi diffence I could understand but a difference of 50 psi between the fox/Halfords and the lifeline is a huge difference!!!
Borrow a shockwiz as you then have a baseline to compare it to?
Because the gauges are cheap shitty 10p things with poor tolerances and relatively high internal friction.
Consistency is more important than accuracy, Once you've found the pressure you like, just use the same pump all the time.
Simple basic, relatively inexpensive pumps and gauges. I’m always impressed how well they work considering what they are doing and how cheap. Same kit to do equivalent job on specialist equipment costs hundreds if not thousands, and has to be checked, tested, reset at least every year.
Most important thing on a bike is to use same one and refer to its figures. We aren’t setting up to a specific figure (which is usually the case in engineering) , we are going to our sag and feel and conditions. Make a note of those for one pump and reference that. When racing we check every pressure before every run, against a table of tyre/shock/fork, each gauge and conditions - set it to the table and then adjust by feel each run but if uncertain, the table fuels.
Mine is distinctly inaccurate as I managed to bend the needle! It is however consistent which is all thats needed
Had one for a few months, rear shock and forks were near spot on what TF tuned set them to
I get what the rest of you are saying by just use the same one to set the shock up each time but a, difference of 50 psi is quite a a lot!
I went for RockShox / Fox digital shock pump (same product sold under several brands), it is a lot easier to fine tune suspension with it and record the numeric values to log book (my garage wall actually). This is hardly accurate between individual units but has been working well for 4 years now.
I have Topeak mini shock pump in the backpack, it doesn't have gauge but on rides it is not necessary anyway. Less than 100 grams and well used - mostly on other peoples bikes!
Consistency is more important than accuracy, Once you’ve found the pressure you like, just use the same pump all the time.
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