Monday, June 21, 2010

Set your Sag!

The most important thing to get right when setting up your shock is to get the sag right... get that right and your 80% done, then you just have to dial in the damping settings.

So, here are some graphs showing the Suspension Sag vs. Shock Compression for each of our full sus rigs.

A lot of people think 30% sock compression = 30% sag, but that is not normally the case, it all changes due to leverage ratio curves. Hopefully these graphs I made up will help you tune your bike in more accurately.








9 comments:

Diego said...

Interesting... looks like all have a pretty linear characteristics with in sag, and then they ramp up (or decrease, not sure) latter in the travel.

Keith, I have a question regarding setting proper sag, specifically on the Rune. I remember the old banshee website stated 15%, then the new one is 15%-25%. And i remeber some discussion on MTBR go as far as 30%. What would be the best sag (that sweet spot) for a balance compromise? I know this can be hard to define since it means different things to different people... so in other words.. what are the expected characteristics of the bike with a 15% sag, and what are the ones with a 25% sag.

This is relevant to us using coil shocks where changing sag is not as straight forward as with changing it on an air shocks.

Thanks for your input

Keith Scott said...

Sorry, that 15% sag you saw must have been a typo, I recommend running 25% sag, but you can vary happily between 20 and 30% depending on what ride characteristics you want.

there isn't really such thing as a sweet spot as it changes depending on what ride characteristics you want, and what gear you are in and what terrain you are riding. but I'd say 25% is about right for most people.

Kaj said...

what am i missing here?

linear relationships when graphed will have a straight line.

NON LINEAR RELATIONSHIPS will have an exponential curve. IE when the x variable changes it doesn't always effect the y variable in the same degree.

all the graphs you posted have a straight line which shows a perfectly linear relationship.

What don't I get?

Keith Scott said...

Yeah, I shouldn't have actually used this type of graph technically speaking, as I actually plotted the shock compression versus sag to get exact compression values, I should have the graph the other way round, but it seemed that people found it easier to do it this way. Just read the sag off that you want, follow along then go down to the x-axis to get an exact value of shock compression to hit that sag.

The graphs may look linear, but only because the X-axis is not on a linear scale but instead uses exact values (rounded up to nearest 0.1mm so that affects thing as well), then excel just spaced out equally.

Kaj said...

oh now i see.... thanks for the quick response.

Kaj said...

oh now i see.... thanks for the quick response.

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Roland said...

I know that's an old one but Keith I would have a few question.
I have a scythe 2009.
-does the same chart apply with 216mm shock?
-does it make any different on if you using dh-fr or 7" to 8" setting?
I have totem solo air upfront and dhx 5 coil on the back I have figured it out over the years what is my settings for park ride and normal trail riding but I just like to know what would be the "factory" recommendation /like air pressure,clicks on dials etc/for my fork and shok?my weight 94kg so what would be your suggestion?Cheers