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Old 08-27-2010, 03:38 PM   #1
Pre-K
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SAG NUMBERS... % OR LENGTH?

Lets say you've decided on 25%... now then...

The front forks have 4" of travel, so rider sag should be 1".



Now here is the question: If the rear shock has 8" of travel, sag should...

A. Sag should be 2" (which gives you 25%)

B. Sag should be 1" (same sag as the front but only 12.5%)





(the two extremes in fork vs. shock travel are just used to make my question more clear, the travel is not THAT different in case you were wondering what kind of bike had such distorted front and rear travel)
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Old 08-27-2010, 06:18 PM   #2
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Why do you want to set your sags by percentage?

I have ohlins and they give me the sags by millimeter.
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Old 08-27-2010, 07:20 PM   #3
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Quote:
Originally Posted by Pre-K View Post
Lets say you've decided on 25%... now then...

The front forks have 4" of travel, so rider sag should be 1".



Now here is the question: If the rear shock has 8" of travel, sag should...

A. Sag should be 2" (which gives you 25%)

B. Sag should be 1" (same sag as the front but only 12.5%)





(the two extremes in fork vs. shock travel are just used to make my question more clear, the travel is not THAT different in case you were wondering what kind of bike had such distorted front and rear travel)
Dynamic as a percentage of static??
I've never thought of them as percentages!
mm for me too.
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Old 08-28-2010, 08:24 AM   #4
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MAYBE Y'ALL CAN TELL ME THIS... What are your sag numbers AS COMPARED TO your total travel numbers?
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Old 08-28-2010, 08:45 AM   #5
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Quote:
Originally Posted by Pre-K View Post
MAYBE Y'ALL CAN TELL ME THIS... What are your sag numbers AS COMPARED TO your total travel numbers?
The answer is simple. Since you're a fat , you'll have more sag. Just set your dials on and you'll be fine
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Old 08-28-2010, 10:06 AM   #6
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Quote:
Originally Posted by Godsuki View Post
The answer is simple. Since you're a fat , you'll have more sag. Just set your dials on and you'll be fine
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Old 08-28-2010, 10:32 AM   #7
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Sag numbers depend on the bike, the rider and it's intended use, but typically they are not a percentage of travel.
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Old 08-28-2010, 10:43 AM   #8
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Quote:
Originally Posted by Godsuki View Post
The answer is simple. Since you're a fat , you'll have more sag. Just set your dials on and you'll be fine
I know! I had to quit drinking beer!

Anyway, I think I figured out what to do... I set the F & R at the same amount of sag in millimeters (although that makes the rear at 25% and the front at 30%) and it feels much better.
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Old 08-28-2010, 10:55 AM   #9
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Quote:
Originally Posted by Patrick View Post
Sag numbers depend on the bike, the rider and it's intended use, but typically they are not a percentage of travel.
The KTM in question has 135mm of fork travel and 160mm of shock travel.

I could set front sag at 40mm (30%) and the rear at 48mm (30%)... OR
I could set front sag at 40mm (30%) AND the rear at 40mm (25%).

See the difference?

I put it at 40mm front AND rear and it feels much better, so I ultimately answered my own question
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Old 08-28-2010, 07:03 PM   #10
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My sags are set at 40mm front and 28mm rear. I attempted to set the sags myself after getting the suspension back from Ohlins and I screwed up the bike so badly I could barely ride it at the track. Lap times went from 47/48's to 52's. Had to get Patrick's help to fix it.

Keep in mind that sags have a huge impact on geometry as the bike is being ridden. I think the average track guy can feel as little as a 2 to 3mm change in geometry on the front or rear.
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Old 08-28-2010, 07:23 PM   #11
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for those wanting to follow along that may be a little confused

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Old 09-02-2010, 05:01 PM   #12
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i guess we should assume you're talking rider sag,,,,
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Old 09-02-2010, 05:07 PM   #13
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Quote:
Originally Posted by rc51eviltwin View Post
i guess we should assume you're talking rider sag,,,,
YUP...

and I KNOW I've seen something from RaceTech which suggests sag be 20-25% for the track, and 30-35% for the street (percentages of total travel).

Last edited by Pre-K; 09-02-2010 at 05:09 PM.
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