stock shock spring rate and dimensions - Ducati 899 Panigale Forum
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post #1 of 13 Old 11-21-2014, 06:10 PM Thread Starter
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stock shock spring rate and dimensions

Does anyone know the stock spring rate and length of the rear shock? Or series part numbers ect. Need a stiffer one on mine, but after the kerfuffle I had at my local suspension shop re:the forks, thinking I might just order online.

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post #2 of 13 Old 11-21-2014, 06:35 PM
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The center to center length is 31cm. I just replaced mine with a TTX today. I've heard both 85N/mm and 90N/mm for stock so I'm not sure. You can take your weight divided by the delta when you sit down (although I'm not sure this is exactly accurate either since there is some mechanical advantage in the linkage). Or if you take the shock off and add a load directly, take the weight divided by the deflection. I've seen it given in lbs/in and N/mm.

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post #3 of 13 Old 11-25-2014, 07:51 AM
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If I remember correctly, the 899 spring is 280mm long and its rate is 78N/mm. The 1199 spring is 260mm long and 90N/mm.
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post #4 of 13 Old 12-08-2014, 11:16 PM Thread Starter
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Changed it today, had it tested as well.

I measured the stock rear spring at
10.5mm spring dia
70mm od
48.5 id
178.5mm long

The shop measured the stock spring rate at 8kg.

I have replaced it with a ohlins spring, but it was not perfect dimensions and they had to machine 2 collars/spacers for it. I dare say there may be one that bolts straight on, the above measurement should be enough to contact a suspension shop and get started. Hope this helps someone
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post #5 of 13 Old 12-09-2014, 02:01 AM
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So what did you put in it mate? And do you mind me asking what you weigh all kitted up? Looking at doing the same myself.
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post #6 of 13 Old 12-09-2014, 03:04 AM Thread Starter
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So the spring in it now is a Ohlins 21040-29 90nm (there's another number on the packet that says SPRING 51/160/90). Like I said, it was not a straight swap, it did need collars, and there might be a spring out there that is a straight swap. (although you might be able to get away with putting it in without collars, but it would be a bit dodgy IMO)

The suspension guy recommended the stiffness of 90nm based on a rider weight without gear of 100kg (220lb). When you compare it to the stock stiffness of 80nm, I could probably have gotten away with a 95nm one too, but, I'm not planning on carrying a pillion ever so I guess it's not a biggie.

The only other thing I would say is consider having it revalved while you are at it. He quoted me AU$300 to do mine, and I passed for the moment figuring its easy enough to take off and do later if I think it needs it. He says he can take a lot of harshness out of small bumps with a revalve.
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post #7 of 13 Old 12-09-2014, 07:32 PM
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Awesome, thanks mate. I think the number on the packet is ID, length and rate but don't quote me on that. Will have a look.

I'm 90 so not too far off. I like my bikes set up stiffer in the rear anyway, especially for the track. Makes them a bit skittish on the road though. I pulled the rear pegs etc when I fitted the seat cowl. Even though in theory it will carry a pillion its not really the bike for it.

That's a pretty good price really. Do you know how he set the stock adjusters to compensate for the stiffer spring?
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post #8 of 13 Old 12-10-2014, 07:58 AM
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Quote:
Originally Posted by Macca68 View Post
If I remember correctly, the 899 spring is 280mm long and its rate is 78N/mm. The 1199 spring is 260mm long and 90N/mm.
clearly I was talking rubbish on the spring length. Ryder is right, the 899 is around 180mm long.
I went for a 90Nm spring from K-tech which is for the Ohlins shock. It also needs collars to fit snug on the shock's perches.
I weigh 90 kg without gear and to me it feels spot on.
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post #9 of 13 Old 08-21-2015, 02:45 PM
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Quote:
Originally Posted by Macca68 View Post
clearly I was talking rubbish on the spring length. Ryder is right, the 899 is around 180mm long.
I went for a 90Nm spring from K-tech which is for the Ohlins shock. It also needs collars to fit snug on the shock's perches.
I weigh 90 kg without gear and to me it feels spot on.
howdy, could i trouble you with asking how you found the ktech spring, did you ask a dealer? i cant find 899 springs on the ktech homepage
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post #10 of 13 Old 08-21-2015, 05:17 PM
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Originally Posted by My899fox View Post
howdy, could i trouble you with asking how you found the ktech spring, did you ask a dealer? i cant find 899 springs on the ktech homepage
Why not go with an Ohlins? I had a shop fit a (stiffer) Ohlins spring on my stock shock. It fit without issues and there was no need for a spacer either. I can provide a part number if you're interested.
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