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Online SwiftTone

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What is the target sag?
« on: September 20, 2018, 01:16:32 PM »
According the manual in the "On The Racetrack" section, the ideal sag is 6-10mm front, and 20-24mm rear.

According to Racetech, for the track its 25-30mm front and 25-30mm rear. For the street it should be 30-35mm front and 30-35mm rear.

So what should our target be?

Online SimonUK

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Re: What is the target sag?
« Reply #1 on: September 20, 2018, 01:31:11 PM »
If you have a DDC bike I would go with the BMW manual. BMW uses 'Rider' SAG. I am guessing the Racetech is quoting total SAG.

Online SwiftTone

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Re: What is the target sag?
« Reply #2 on: September 20, 2018, 03:40:47 PM »
*Originally Posted by SimonUK [+]
If you have a DDC bike I would go with the BMW manual. BMW uses 'Rider' SAG. I am guessing the Racetech is quoting total SAG.

According to RaceTech's article, they use Rider Sag aka Rider Sag.

Also note; BMW sag settings are listed in the "On The Track" section of the manual.

I'm 190lbs/86kg fully geared. I haven't set sag yet but hopefully I'm in the spring range.

Offline zombie

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Re: What is the target sag?
« Reply #3 on: September 20, 2018, 04:27:34 PM »
If you're 190lbs, it's likely you'll be able to get the sag set properly on a DDC bike, anyone heavier is more likely to be out of luck.  (the manual states an 85kg rider i.e. 187lbs)

Online SwiftTone

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Re: What is the target sag?
« Reply #4 on: September 22, 2018, 03:59:58 PM »
So still looking for an answer on this. Should I go with BMW's front 6-10mm and rear 20-24mm, or Racetech's front and rear 30-35mm?

Do you guys feel like BMW's numbers feel too stiff? Those numbers are even stiffer than Racetech's track numbers.

Offline zombie

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Re: What is the target sag?
« Reply #5 on: September 22, 2018, 04:27:55 PM »
You did get an answer, follow the manual if you have DDC, use any method you like if you don't have DDC, there is a difference in how BMW calculates sag over what most people would consider the "conventional" way, that's likely why the numbers are so different.
« Last Edit: September 22, 2018, 04:39:38 PM by zombie »

Offline SimonS1KR

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Re: What is the target sag?
« Reply #6 on: September 22, 2018, 04:35:08 PM »
*Originally Posted by SwiftTone [+]
Do you guys feel like BMW's numbers feel too stiff? Those numbers are even stiffer than Racetech's track numbers.

Preload has no effect on stiffness, youd have to change springs for that.

Online SwiftTone

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Re: What is the target sag?
« Reply #7 on: September 22, 2018, 05:01:57 PM »
*Originally Posted by SimonS1KR [+]
Preload has no effect on stiffness, youd have to change springs for that.

Ok wrong choice of words.

Has anyone topped out the suspension while going over dips in the road?

Offline CrazyBiker

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Re: What is the target sag?
« Reply #8 on: September 22, 2018, 05:59:38 PM »
I am within BMWs limits but have bottomed mine out mainly due to the god damn crazy front brakes. Alls good though, just run it in normal in the twisites not in soft. Soft is for commuting and freeway jaunts.
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