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Old 07-14-2010, 08:53 AM   #1
Moab OP
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Front end wobble on 800gs

Breaking in my new 800 gs, love the zippiness and agility of the bike, just one issue for me...when I get to 70mph or above my front wheel starts moving side to side, not drastic but enough to make me wonder.

Have nobbies on, and i am coming from an 1150 gs and klr 650 that never had this wobble (and i think that the front tire is similar on the klr?)

anyway, I cant tell if this is the wind buffeting me and me causing it? or is this an issue I need to see the dealer about? or do i just need to get used to it cause its inherent on this bike.

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Old 07-14-2010, 09:06 AM   #2
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Quote:
Originally Posted by Moab
or do i just need to get used to it cause its inherent on this bike.

I only get the wobble with some knobbies. Never happened with the Battlewings nor the Heidenaus, but now that I have the Mefo on the front (don't like that tire at all ), I get a mild wobble at higher speeds. You may want to see if there's any difference when you swap out your tires.

David
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Old 07-14-2010, 10:40 AM   #3
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I was just writing up some thoughts on the 800 after going 4700 miles over every imaginable road surface in 9 days of driving. The front end with knobbies and highway driving became an issue on the trip. It is unstable. Above 90 mph it is downright dangerous. Yes, at highway speeds with knobbies you will feel the frontend wobble. I felt it with the battlewings as well but it was not as pronounced as when I went to TKC-80's.

Up to 85 I just had to get used to the wobble. It never affected cornering or my ability to maintain control of the bike. You start going faster than that and you have some issues. Just be aware and watch your speed, particularly when you are passing at interstate speeds. More details will be in a post I'm working on.

Cathy

Quote:
Originally Posted by Moab
Breaking in my new 800 gs, love the zippiness and agility of the bike, just one issue for me...when I get to 70mph or above my front wheel starts moving side to side, not drastic but enough to make me wonder.

Have nobbies on, and i am coming from an 1150 gs and klr 650 that never had this wobble (and i think that the front tire is similar on the klr?)

anyway, I cant tell if this is the wind buffeting me and me causing it? or is this an issue I need to see the dealer about? or do i just need to get used to it cause its inherent on this bike.

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Old 07-14-2010, 10:56 AM   #4
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Quote:
Originally Posted by GrizGirl
I was just writing up some thoughts on the 800 after going 4700 miles over every imaginable road surface in 9 days of driving. The front end with knobbies and highway driving became an issue on the trip. It is unstable. Above 90 mph it is downright dangerous. Yes, at highway speeds with knobbies you will feel the frontend wobble. I felt it with the battlewings as well but it was not as pronounced as when I went to TKC-80's.

Up to 85 I just had to get used to the wobble. It never affected cornering or my ability to maintain control of the bike. You start going faster than that and you have some issues. Just be aware and watch your speed, particularly when you are passing at interstate speeds. More details will be in a post I'm working on.

Cathy


I am using the tkc's.......send me a link to your post when complete, id like to read it.
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Old 07-14-2010, 03:23 PM   #5
Maniac28
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I am having the same issue since switching the battlewing front tire to the TKC. Grizgirl, I read your other post and agree about the issues with the bike that you address. However, I know there is no perfect bike. Everything is a compromise I suppose.
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Old 07-14-2010, 04:59 PM   #6
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Quote:
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Everything is a compromise I suppose.
Exactly. I came from the big Boxer twin, and have ridden it up to Prudhoe and back. But given the choice, and after 24K miles on the F800, I'd take it for any "Adventure" ride over the Boxer any day. Having wrestled that pig over too many difficult surfaces, I'll gladly put up with the lack of range and high-speed cruising shortcomings of the F800. I can carry extra gas when necessary, and keep it under 90 mph easier than I can reduce the weight of the Boxer. But ain't it grand that we have other choices?

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Old 07-14-2010, 08:34 PM   #7
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I would like to make two observations about F800GS instability.

First when I first got the bike I noticed that there was a lot of movement from the windblast from passing semi trailers. I needed a better windscreen for comfort and ended up with a Calsci. (If I was doing it now I would probably get a Wunderlich ergo vario screen because of its adjustability.) One of the first things I noticed was much more stabilty in wind and windblast.

The second thing is the tyres. The most instability I noticed was with a front Dunlop 606 knobby and a badly worn rear TKC80. It was bad enough to be a constant worry in the back of your mind. I then replaced the worn TKC with a Heidenau K60 ... much better, much more stable. Soon the front Dunlop wore out and I replaced it with another Heidenau K60. On the road the K60's are very good, good grip and very stable up to at least 180Km/hr. However I don't like the front K60 on loose surfaces like mud and sand, so I would probably not buy another one. I will probably try and run a front TKC and a rear K60.

Bottom line ... Knobbies are less stable at high speeds and get worse when they are worn. I think the rear K60 would be more stable than the TKC, and I think a good windscreen can probably increase stabilty as well as comfort. YMMV (as you yanks say!)

I would seriously consider a Rally-moto steering damper, if it wasn't for the price ... I imagine that it would be a big help in most conditions.

Ducksbane screwed with this post 07-14-2010 at 08:48 PM
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Old 07-15-2010, 04:50 AM   #8
supertorro
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Front End wobble only after knobbies

yep, had the same front end wobble when I changed from the stock tyres to 50/50 tyres. front was a heidenau k60 and rear was metzler sahara enduro.
really bad wobble at speed. I found the only way to cure it was to adjust the rebound on the rear, and that seemed to make it behave a little better.

since i've replaced the metzler with a heidenau the problem seems to have gone away some, so I can run the rebound more where I prefer

my 0.02
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Old 07-17-2010, 12:30 AM   #9
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Quote:
Originally Posted by Ducksbane
I would like to make two observations about F800GS instability.

First when I first got the bike I noticed that there was a lot of movement from the windblast from passing semi trailers. I needed a better windscreen for comfort and ended up with a Calsci. (If I was doing it now I would probably get a Wunderlich ergo vario screen because of its adjustability.) One of the first things I noticed was much more stabilty in wind and windblast.

The second thing is the tyres. The most instability I noticed was with a front Dunlop 606 knobby and a badly worn rear TKC80. It was bad enough to be a constant worry in the back of your mind. I then replaced the worn TKC with a Heidenau K60 ... much better, much more stable. Soon the front Dunlop wore out and I replaced it with another Heidenau K60. On the road the K60's are very good, good grip and very stable up to at least 180Km/hr. However I don't like the front K60 on loose surfaces like mud and sand, so I would probably not buy another one. I will probably try and run a front TKC and a rear K60.

Bottom line ... Knobbies are less stable at high speeds and get worse when they are worn. I think the rear K60 would be more stable than the TKC, and I think a good windscreen can probably increase stabilty as well as comfort. YMMV (as you yanks say!)

I would seriously consider a Rally-moto steering damper, if it wasn't for the price ... I imagine that it would be a big help in most conditions.
+100 Great post.
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Old 07-17-2010, 12:38 AM   #10
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Hows your air pressures. Lots to be said about increase and decrease pressures on and off road with those tires. Look in other threads on the TKC's.

Ride safe
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Old 07-17-2010, 10:53 AM   #11
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Relax your grip on the bars and dont pull with your arms to compensate for the wind hitting your chest. Knobbies dont make good street tires and vise versa.
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Old 07-17-2010, 10:56 AM   #12
Boon Booni
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Quote:
Originally Posted by Moab
Breaking in my new 800 gs, love the zippiness and agility of the bike, just one issue for me...when I get to 70mph or above my front wheel starts moving side to side, not drastic but enough to make me wonder.

Have nobbies on, and i am coming from an 1150 gs and klr 650 that never had this wobble (and i think that the front tire is similar on the klr?)

anyway, I cant tell if this is the wind buffeting me and me causing it? or is this an issue I need to see the dealer about? or do i just need to get used to it cause its inherent on this bike.

Have you tried adjusting the height of the forks in the triple trees? Raising the forks in the trees often alleviates a high speed weave in other bikes.
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Old 07-17-2010, 08:07 PM   #13
geno_rocket
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I am running the H60s and sure enough, I noticed the front end wobble around 60mph when riding on a highway surface with rain grooves. it gets pretty pronouced if the surface is cut concrete, but have experienced it on asphalt as well. On smooth asphalt there does not seem to be an issue, but I have not gone much higher than 80mph. I have a grooved patch of concrete interstate right near my house that is a wake up call on every ride out of town.

I am guessing it is a combination of telescopic front forks, a big front diameter wheel and the knobbies. I would venture the big R bikes with their different suspension have a very different critical mass. A while back I had a CBX with a larger front diameter wheel and it would wobble and shake on the same cut concrete grooves - giving a real thrill.
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Old 07-17-2010, 09:59 PM   #14
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Street tires here, no wobbling going on at high speeds.
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Old 07-18-2010, 02:49 AM   #15
Ducksbane
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Geno_Rocket ... I think you should check your rear ride height ... Much as I dislike the front K60 on loose surfaces I have Never had any instabilty on a firm surface.
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