New posts

Shock pump recommendation?

Jan. 27, 2019, 8:17 a.m.
Posts: 893
Joined: Feb. 5, 2011

My current shock pump literally lets out 5-10 psi every time I disconnect the valve so it's very challenging to set my suspension up accurately. Do all pumps have this issue (to some extent)? I would imagine that at least a little bit of air would inevitably leak out at you disconnect any pump but I would imagine some are better than others. What are you guys using that works well?

Jan. 27, 2019, 8:42 a.m.
Posts: 800
Joined: Nov. 23, 2002

you'll always lose a bit of pressure connecting the pump as the hose and the gauge on the pump has to be primed/pressurized for the gauge to read what's in the shock and of course that air comes from the shock. considering that the volume of air held in most shocks is not all that high you're going to lose some shock pressure no matter what. in terms of set up i think the trick is to set your pressure, disconnect the pump and then reconnect it a couple time to see exactly how much the pressure drops, so you know how much you're losing when you connect your pump.

however it shouldn't be an issue when you disconnect the pump as the pressure you're losing is from the pump, not the shock. as you disconnect the pump the valve on the shock closes before the pump is disconnected so the air you hear leaking out is from the pump, not the shock. the reason the pump reads lower when you connect it again is for the reason i stated first - that the air in the shock is filling up the hose and the gauge on the pump. that "loss" should be consistent every time you connect the pump.

if you're really concerned about it though some pumps have a separate knob to release just the valve on the shock, and then the end of the pump can get screwed off the shock. this pretty much ensures no loss when taking off the pump. note that you'll still lose some pressure though when you connect the pump back up as the pump needs to be primed with air from the shock.


 Last edited by: syncro on Jan. 27, 2019, 9:01 a.m., edited 1 time in total.
Reason: sp
Jan. 27, 2019, 8:53 a.m.
Posts: 893
Joined: Feb. 5, 2011

Thanks for the explanation! That makes a lot more sense to me now. Maybe I don't need a new shock pump.

Jan. 27, 2019, 7:57 p.m.
Posts: 1915
Joined: May 2, 2004

Rockshox digital one is sweet though. Nice to see 172psi instead of somewhere between 160-180 or whatever the dial says

Jan. 28, 2019, 7:15 a.m.
Posts: 893
Joined: Feb. 5, 2011

Posted by: Kevin26

Rockshox digital one is sweet though. Nice to see 172psi instead of somewhere between 160-180 or whatever the dial says

Yeah that always confused me... people talking about putting exactly X psi in their fork/shock and then you look at the dial on most pumps and it goes from like 0-300 psi and the whole dial is only 1 inch in diameter. Obviously the digital gauge would solve that problem. That Rockshox digital pump was the one I was thinking of upgrading to. 

Same thing with sag... you watch an interview with some pro talking about their bike and they are like "I started with 32% sag but then tried 33% and it felt much better"... like how the hell can you accurately change the sag by 1%?!?!

Jan. 28, 2019, 7:57 a.m.
Posts: 980
Joined: Feb. 26, 2015

Posted by: Bull_Dozer

Posted by: Kevin26

Rockshox digital one is sweet though. Nice to see 172psi instead of somewhere between 160-180 or whatever the dial says

Yeah that always confused me... people talking about putting exactly X psi in their fork/shock and then you look at the dial on most pumps and it goes from like 0-300 psi and the whole dial is only 1 inch in diameter. Obviously the digital gauge would solve that problem. That Rockshox digital pump was the one I was thinking of upgrading to. 

Same thing with sag... you watch an interview with some pro talking about their bike and they are like "I started with 32% sag but then tried 33% and it felt much better"... like how the hell can you accurately change the sag by 1%?!?!

Agreed ^^

Also does outside temperature not affect pressure somewhat? Setting the air pressure inside then riding in 6 degree temp must affect the PSI.

Jan. 28, 2019, 8:53 a.m.
Posts: 2176
Joined: Sept. 5, 2012

https://ep1.pinkbike.org/p4pb14594485/p4pb14594485.jpg

https://www.sks-germany.com/en/nachrichten/shock-pump-sam-with-the-best-test-result/

I have the above style shock pumps , I prefer the top one over the bottom one . The S.A.M. I find tougher to pump with being such a short pump.

Jan. 28, 2019, 1:06 p.m.
Posts: 443
Joined: Feb. 24, 2017

how about the Lezyne shock digital drive.

https://www.youtube.com/watch?v=RUYcEV-2Pek

Jan. 28, 2019, 3:15 p.m.
Posts: 1915
Joined: May 2, 2004

If you're a super nerd you can get a shockwiz that shows sag, psi, all live and see if it's changing with temperature


 Last edited by: Kevin26 on Jan. 28, 2019, 3:16 p.m., edited 1 time in total.
Jan. 28, 2019, 7:55 p.m.
Posts: 2176
Joined: Sept. 5, 2012

Posted by: JBV

how about the Lezyne shock digital drive.

hmm roughly $140 , might have to grab one , I don t mind buying decent bike tools.

Jan. 29, 2019, 12:17 a.m.
Posts: 24
Joined: Sept. 27, 2017

I have a Bontrager shock pump. Have no problems with it.


 Last edited by: robern on Jan. 29, 2019, 12:18 a.m., edited 1 time in total.

Forum jump: