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Im 16.5st or aprox 105kg and I want to run 25% sag on my YT Wicked 160.
The table here - [url= http://www.bosmtb.com/pdf/ViprChart.pdf ][/url]
is recommending 240 > 255 PSI ish.......a long way off where I am currently.
To achieve 25% I need to run circa 300PSI...........is something wrong here?
Recommendation charts are often just made up nonsense but BOS don't have that rep...
Out of curiosity are you measuring sag stood up or sat down, and are they?
Also - make sure your whatchamacallit is set to "soft"
Maybe you're fatter than you think ?
Set when sat down on the seat, trying not to apply more pressure than is necessary.
Weeksy - I'm nowhere as fat as I think I am, I have a complex. There is nothing worse than someone who used to be fat.......or an ex smoker. Dont make me get the photo out !
🙂
I am suprised at your weight mate... you showed some of the slimmer guys a clean pair of heels that's for sure 🙂
just so you know.... i still see myself as the bloke in the picture when i look in the mirror.
Shock not set up for big bloke surprise. Had the same with my five; the RP23 was awful and required loads of pressure until it went back to mojo to be adjusted for my heavier weight and i'm only 14.5 stone. Speak to Bos, they'll probably suggest an aircan reducer kit or something.
For what it's worth, if you are intending to use the bike for descending biased riding it will probably feel best if you set the sag stood up with all your weight on the pedals, the way it'll be when you wanting the suspension to work best. That'll need a bit less pressure.
I'm just over 14st and pump my vip'r upto about 250-260psi to get the 17mm of measured sag. I think they lose something like 30+psi when you unscrew the pump so you have to aim off and just go by what the o ring says when you sit on it. The valve isn't as good as a fox shock I don't think and drops a load of air, not just the air in the hose of the pump.
Aye, it's usually recommended to set sag in "attack position" or whatever it's called today, sitting down will weight the shock up more.
I can't view the PDF, but is it a generic one or specific for the bike? Generics don't really work for shocks as different frames work in different ways- changing leverage ratios etc.
The pressure chart is bike specific. Even taking into account the difference between the tracers two travel settings for example
Ah that's good then, you don't often see that.
(I followed generic guidance from somewhere like TF on my Idrive, jumped on and discovered I couldn't make the suspension move at all 
)
Quick question to vip'r users. How much noise does your shock make when in use. Mine clicks when going through its travel on the soft setting and wondered if anyone else's did?!
The Vip'r does require higher pressures than equivalent fox shocks. Read this:
http://dirt.mpora.com/news/bos-vipr-shock-exclusive-uk-ride.html
I personally found the air tables to be pretty useless. One thing worth considering is the leverage curve of the bike, as oppose to the overall leverage ratio (2.5:1 on the YT).
What I mean is quite a few frames start off high leverage rate to feel initially plush, small bump sensitivity etc, they then flatten to a linear rate for the mid third of the travel for neutral pedal (i.e. less feedback), then lower the leverage rate in the last third so it ramps up & feels 'bottomless'. I seem to recall this is the case for the wicked.
I had a last herb that was a nightmare to setup until I worked it out myself. This bike had a very high ratio in the 1st bit of its travel (somewhere over 3:1 if I recall correctly), so I couldn't get the sag right to save my life. I then settled in 35-40% sag and it felt great. It worked fine throughout its travel despite the deep sag.
sandal100 - Member
Quick question to vip'r users. How much noise does your shock make when in use. Mine clicks when going through its travel on the soft setting and wondered if anyone else's did?!
No noise whatsoever on mine.
Mine clicks on soft when the going is rough. It's been to France but they say there's nothing wrong. If you leave it a while, then it doesn't click on soft until it gets some bigger/constant hits. Then it starts up. It doesn't click on hard at all.
Hmm - interesting points about the clicking. Mine's recently got quite loud so I guess it needs a service. I emailed BOS who said some clicking was normal but if it's become louder then it probably needs a fix.
Mines pretty much brand new and has about 7-8 hours riding on it. I did lawson park in grizedale/coniston area and hit as many rough parts as possible and it works really well so I'm not worrying too much. I'm just goin to wait until surf sales have had a month or two of vein the bos people and then send it in for something