[eddiegold]

quick question for you guys. I've just got a 450lb spring for my pdc and iam unsure on how to check the sag. When iam not sitting on the bike the spring measures about 156mm when i sit on it i measure it at about 138mm does this sound like the right amount of sag. Or iam going about this all wrong
thanks

 

[V-Dub GTI]

That is around 12% sag. Witch sounds about right.

 

[gazeebos love]

You run your say at 12%...boy you like it hard!

Im running at around 35%...

How heavy are you?

 

[V-Dub GTI]

You run your say at 12%...boy you like it hard!

Im running at around 35%...

How heavy are you?

I run [depending on that days riding] any where from 15%-25%. And I did the math in my head so its probally closer to 20%. :biggrin:

 

[dropmachine]

8 percent I think actually.

Your spring is too damn hard. get a 400, call it a day.

depending on use, 25-35% is average for sag, with some riders going to 50%.

 

[dsotm]

You're also supposed to only measure the change in the actual stroke length of the spring to find a percentage, not the length of the spring. The PDC 825 has a 2.75" stroke shock or 68mm. So, you have about 23% sag. Try a lighter spring to give you between 25% and 35% sag.

 

[Iridemtb]

Whats the point of sag? Small bump abosorption or what?

 

[V-Dub GTI]

Whats the point of sag? Small bump abosorption or what?

Negative travel for ruts and divits. [At least thats what I think....]

 

[AngryMetalsmith]

This should help
http://www.tftunedshox.com/springcalc.htm

 

[DraVen]

now you all have me thinking i weigh about 255#'s and i ride a 05 stinky with a 5th element shock that has 2.75 stroke and 450#spring.... and i was fixing to order a 600# spring and was wondering if that is the right rate spring i should get...

P.S. the stock shock was 8.5 ItoI this one is 8.75 and i have no clearance problems

 

[eddiegold]

thanks for replys, i can back the preload off as as i have it preloaded to the maximum amount going by the zocchi manual. I weigh about 195lb last time i checked, i've been running a 500 since i had the bike and only changed because i saw this ti one on ebay.
Off to les arcs in the french alps on saturday so just getting the bike prepped:biggrin:

 

[stinky6]

thanks for replys, i can back the preload off as as i have it preloaded to the maximum amount going by the zocchi manual. I weigh about 195lb last time i checked, i've been running a 500 since i had the bike and only changed because i saw this ti one on ebay.
Off to les arcs in the french alps on saturday so just getting the bike prepped:biggrin:

you should only run one turn of preload or its hard on the shock

 

[ChrisRobin]

What kind of shock? I remember when the 5th's came out on the newish M1s, people were running them easily with 50% sag because of the bottom out adjustment.

I think I'm running about 35-40% sag. If I bottom out once or twice on a run, I find that ok.