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Old Today, 06:08 AM   #1
mjc506 OP
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Joined: Feb 2013
Location: Oxfordshire, UK
Oddometer: 43
Suspension set up - rate and preload for sag

Not sure if this in the right area, but I ride a DL650, so suck it

I'm trying to set up the suspension on my bike, but need some advice.

Apparently, the 'optimum' sag settings on any bike are 14% static, 25% race sag on the front, and 11% static, 34% race on the back. That's fine, it makes sense to me (but how were these numbers determined?), but I'm not sure its correct for every bike? (A half-ton Harley with a 50kg rider will surely have different sag settings than a 250kg rider on a TW200?)

Anyway, assuming the above is true, I've calculated I'd need 0.775kg/mm front springs, with 46.75mm preload, and 9.98kg/mm rear spring with 8.33mm preload.

All the online calculators I can find recommend stiffer springs than this (ie, Racetech recommend something around 12kg/mm on the rear).

So which way is 'best'? Low spring rate, and high preload, or higher spring rate with low/0 preload?

mjc506 screwed with this post Today at 06:13 AM Reason: Can't fkucnig slpel
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Old Today, 10:34 AM   #2
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Joined: Mar 2008
Location: Beaverton, OR
Oddometer: 1,177
I didn't do any of that "calculating" stuff. There is such a huge following of the DLs, I just researched as many threads as I could & came away with a starting point for best spring weight. You'll have to get correct total sag (sack) spring weight first.
I'm about 200 lbs. geared up, & found .90 kg fork springs to be about right. For the rear I'll start with 10.7 kg.
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