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Discussion Starter · #1 ·
I know this has been asked and answered, but here goes.
According to info on this site, I should use a 1091-26 rear spring for my 996. (110kg rider, mono only)
Now, according to my local suspension shop I should go up to a 1091-31, or even stiffer.
The question is, do I run with information on here, which is usually pretty spot on (thanks Shazzam) or do I trust the local shop? A bike shop but not a Ducati specialist.

Cheers
David
 

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Springs for weight are a good baseline...but if your fast in the corners you need to up the rate...that said a stiff spring will be miserable at slower speeds and a soft spring will be miserable at high speeds...you need to ask yourself what's important...then ask if your body supports the decision too...I developed tendonitis in my elbow by taking it easy on a stiffer spring...so be realistic on your goal...sure you can be faster on a stiffer spring...but you might not be able to go slower

What's on your shock at present? Are you bottoming out? If your able it's very helpful to put a camera looking at the shock...if your bottoming hard often then absolutely go up two specs...but if your just kissing the stop than one would be better...and if your hell for leather every corner than go up two and be weary about ever slowing down

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In order for your local bike shop to make its recommendation for the correct rear spring rate they would have needed to first measure your suspension sag numbers.

They would have placed a piece of tape on the bodywork directly above the rear axle and placed a mark on it.

They would need have you in full riding gear in a riding position on the bike — with a half tank of fuel — and measure the decrease in distance between the rear axle and the mark on the bodywork (rider sag) when you get on the bike.

They would have lifted the rear of the bike off the ground, measured the mark-axle distance and remeasured this distance with the bike on the ground to determine the static sag number.

So, what are your static sag and rider sag numbers?

If you or your local shop didn't do these Öhlins recommended standard measurements, what criteria, or direct Ducati 996 experience are they using? Certainly, the same weight rider on different bikes will give different results.

Meeting the (road) static sag 10 mm target value is as important as meeting the rider sag 30 mm target value. The only way that both sag target values and correct ride height can be simultaneously met is if a spring with the correct stiffness and preload is installed.

As previously mentioned, a stiffer spring having less sag for the track is desirable in order to minimize front to rear attitude changes under heavy braking and downward movement in the suspension under heavy cornering forces.

So, when deciding between the two spring rate recommendations above, remember that, like carrying the extra weight of a passenger, you can always add preload to a soft spring, but you can't reduce the stiffness of a hard spring. So I suggest that you err on the side of a softer spring.
 

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Hi Dave. Is the bike doing anything wrong that you think warrants a stiffer spring? Where and how you ride it needs to be considered. The last time I was on Gorge road it is as smooth as.:). For your weight I wouldn’t go more then 9.5kg.
 

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Discussion Starter · #6 ·
OK, Bike feels a little "wallowy" (is that a word?) and seems to squat under power. Sag is 50+mm (eek) and I have about 25mm preload on the spring. The spring is a 1091-21/75.
Gorge road, don't go there often. Too many boy racers and general idiots now :-(
 

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9-9.5. You’ll be right. It’s always been full of boy racers and general idiots, but then we grew up.:grin2:
 

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I have a -26 you can have for cheap if you want to try that.
 

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Also get the shock revalved to match the spring rate. That's important. Anymore than one spring rate change needs to be revalved to work best.
 
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