Gran turismo speed wobble - Page 6 - Ducati.ms - The Ultimate Ducati Forum
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post #51 of 54 (permalink) Old Sep 1st, 2019, 11:29 am
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I know this thread is 6 years old, but I'm posting my speed wobble experience in case it helps. Iíve had a 2018 MS950 for about a year now, outfitted with spoked wheels, Pirelli Scorpion Rallyís (the nobbier ones)) and all the Enduro protections because Iím legitimately off-road in the mountains on my farm a few days a week on it, but IĒm also out on the freeways of central California weekly as well - so no stranger to ďhighĒ speeds on open empty highways. That bike devours it all with ease. Up until last week, I did not own side panniers or a top case. So last week I had to travel several hundred miles and figured Iíd do it on the bike, so I bought the matching Ducati MS panniers and top case kit. First, I luuuuuuuuv my MS - if I lost it today there isnít another bike I would purchase instead - but both those panniers and top case have to be one of the worst value-for-the-dollar purchases Iíve ever made in my life. No sweat, they look pretty and function to hold stuff. But itís what they did to my ride that is the worst. At 80mph, every time I accelerated to pass trucks or cars - and letís face it, everybody is driving 80mph on the freeways in California and so practically speaking to pass pretty much anybody on the freeway you need to accelerate from 80mph to achieve passing speed - the front end would go into speed wobble. Every time. I tried changing the spring damping a bit, noticed a slight but not really acceptable benefit. Laying forward on the tank helped often, but I seriously cannot even count the number of times I needed to recapture stability from a speed wobble at high speed on that long road trip. I tried slowing down and just letting other people pass me - but that was almost just as un-nerving on a 7-hour road trip. I may want to use that top case again (despite it being a grossly overpriced P.O.S.), so I guess Iíll go get the Ohlins steering damper installed. If I had two suggestions they would be (a) if youíre going to get a top case, just make sure you buy a steering damper too, and (b) responsible manufacturers may want to recommend the two always be purchased together.
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post #52 of 54 (permalink) Old Sep 1st, 2019, 12:43 pm
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How much weight are you loading into the cases, top case specifically? They are not rated for a ton of weight, IIRC only about 15lbs (owners manual has this info). All of your heavy stuff should go in the side cases, as they are closer to the center of mass of the motorcycle and generate less disruption. From a vehicle dynamics perspective, the top case location is the single worst position you could add weight to a motorcycle. Combine that with a relatively light bike, compared to other tourers, and we've got a recipe for high speed wobble. My solution has always been to slow down. The cases also have a speed limit on them, for this reason.

I don't know what impact your 19" front wheel would have on this issue, it seems reasonable to think it might make things worse.

You might want to seek out someone with serious expertise in motorcycle steering and suspension issues and ask them if a damper will help in this use case. I'm not that expert, but I wonder if the type of instability being introduced by this aerodynamic drag is the same as what dampers can remediate. The last thing you want it to install something that might mask the problem until you're going 100+, where it overcomes the damper and becomes a serious problem.
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post #53 of 54 (permalink) Old Sep 2nd, 2019, 1:02 am
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Originally Posted by Wiley View Post
I know this thread is 6 years old, but I'm posting my speed wobble experience in case it helps. I’ve had a 2018 MS950 for about a year now, outfitted with spoked wheels, Pirelli Scorpion Rally’s (the nobbier ones)) and all the Enduro protections because I’m legitimately off-road in the mountains on my farm a few days a week on it, but I”m also out on the freeways of central California weekly as well - so no stranger to “high” speeds on open empty highways. That bike devours it all with ease. Up until last week, I did not own side panniers or a top case. So last week I had to travel several hundred miles and figured I’d do it on the bike, so I bought the matching Ducati MS panniers and top case kit. First, I luuuuuuuuv my MS - if I lost it today there isn’t another bike I would purchase instead - but both those panniers and top case have to be one of the worst value-for-the-dollar purchases I’ve ever made in my life. No sweat, they look pretty and function to hold stuff. But it’s what they did to my ride that is the worst. At 80mph, every time I accelerated to pass trucks or cars - and let’s face it, everybody is driving 80mph on the freeways in California and so practically speaking to pass pretty much anybody on the freeway you need to accelerate from 80mph to achieve passing speed - the front end would go into speed wobble. Every time. I tried changing the spring damping a bit, noticed a slight but not really acceptable benefit. Laying forward on the tank helped often, but I seriously cannot even count the number of times I needed to recapture stability from a speed wobble at high speed on that long road trip. I tried slowing down and just letting other people pass me - but that was almost just as un-nerving on a 7-hour road trip. I may want to use that top case again (despite it being a grossly overpriced P.O.S.), so I guess I’ll go get the Ohlins steering damper installed. If I had two suggestions they would be (a) if you’re going to get a top case, just make sure you buy a steering damper too, and (b) responsible manufacturers may want to recommend the two always be purchased together.


I too had a bit of a speed wobble a couple of times WITHOUT the panniers between 200-230. I hanged out the tires to Road 5’s and not more wobble. With the side panniers loaded and (2) 35L bags loaded no wobble at 200+. So I would suspect it to be suspension and or the tires. As for the panniers being POS? Everyone has there own opinion and I too think that they are overpriced. But I happen to think that they are awesome. They don’t hamper the performance like the aluminum ones (not as noticeable) They can hold quite a bit, especially if you have the liners. Don’t leak as of yet (17k on her) and that includes a lot of riding in the rain. Not to mention they are super easy to take on/off with no ugly brackets.
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post #54 of 54 (permalink) Old Sep 2nd, 2019, 10:04 am
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Quote:
Originally Posted by Wiley View Post
I know this thread is 6 years old, snip
ditch the top case and see if you have the same issues. In my experience the top case has a HUGE effect on bike handling (far more than side cases). I've not had speed wobble problems even with a touring load (even at triple digits) but part of that may also be that I'm 240lbs... if you're light then the bags will have a lot more effect, and you may need to manage the weight in the side cases and skip the top case.

My vote for side/top case quality is "excellent"... but yea they ARE crazy overpriced (but most cases are).

15 Multistrada S Touring/Urban/Enduro, 04 Tiger 955i, 86 MaximX 750 (son), 13 Ural (wife)

"Go soothingly on the grease mud, for there lurks the skid demon"
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