front tire bouncing - BMW R1200GS Forum : R1200 GS Forums
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post #1 of 9 (permalink) Old 06-Sep-2019, 03:39 AM (360) Thread Starter
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front tire bouncing

I tried searching but couldn't find a relevant post. I have a '18 R1200GS with ESA that I picked up new this past March. I notice that even when riding on a smooth road, the front end moves up and down rapidly (maybe 1.5 cm or so). I don't feel it through the bars and the bike feels planted. Doesn't seem to be speed, rpm or gear dependent except when on the highway at 70+ in top gear, then the movement all but goes away. I have about 4000 miles on the bike and not noticing any odd wear pattern on front (or rear) tire. So far I've chalked it up to being normal but wanted to ask if others experience the same. Thanks.
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post #2 of 9 (permalink) Old 06-Sep-2019, 04:13 AM (384)
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Do you mean you can see the forks moving up and down a bit? Probably normal. Smooth & flat roads aren't all that smooth or flat!
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Had to be me. Someone else might have gotten it wrong.
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post #3 of 9 (permalink) Old 06-Sep-2019, 04:24 AM (392)
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Change out the tyre, probably out of round

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post #4 of 9 (permalink) Old 06-Sep-2019, 04:56 AM (414)
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There was a problem with loose spokes on the 18 model. Perhaps the wheel is out of round.

Rick
2018 R1200GS
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post #5 of 9 (permalink) Old 06-Sep-2019, 08:36 AM (566) Thread Starter
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Thanks - to answer the questions 1) yes, I observe the forks moving up and down, but at a pretty high frequency. 2) I though about the tire and having the dealer check it out. 3) I've checked my spokes and maybe there are one or two that sound a bit dull. Guess I'll have the dealer check this out as well.
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post #6 of 9 (permalink) Old 06-Sep-2019, 10:34 AM (649)
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There is a condition called tire "cupping" that could cause these symptoms.

Often times this condition is not blatantly obvious. I just changed out a set of Anakees due to this condition. Did the front first and the difference was night and day like.

Replaced with Shinko 705 s and voila, smooth as butter.

'05 1200 GS

Last edited by Southpaw; 06-Sep-2019 at 10:37 AM (651).
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post #7 of 9 (permalink) Old 06-Sep-2019, 11:56 AM (706)
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Just returned from a 2500 mile journey and noticed at speeds of 82 mph +, I got the same experience - came on suddenly during the journey. We had a coupe of 90 + mph runs before the "bouncing" materialized. I thought that perhaps a wheel weight had come off and that could still be the case. New Anakee Adventures with less than 1000 miles. Bike was just in for its 6000 mile service. My friends on their GSAs did not have any hopping going on.
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post #8 of 9 (permalink) Old 14-Sep-2019, 02:36 AM (316)
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I had the same thing happen on my Africa Twin after the rims were rebuilt as a warranty claim because of corroded spokes.
I initially thought that the dealer hadn't trued the rims properly but after checking I noticed that it was the tyre that wasn't running true.
The dealer turned the tyre on the rim and rebalanced the wheel which improved things but didn't entirely eliminate the problem.
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post #9 of 9 (permalink) Old 14-Sep-2019, 07:54 AM (537)
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Quote:
Originally Posted by Ripcord View Post
Just returned from a 2500 mile journey and noticed at speeds of 82 mph +, I got the same experience - came on suddenly during the journey. We had a coupe of 90 + mph runs before the "bouncing" materialized. I thought that perhaps a wheel weight had come off and that could still be the case. New Anakee Adventures with less than 1000 miles. Bike was just in for its 6000 mile service. My friends on their GSAs did not have any hopping going on.
Mines at the dealer now and will update post when I get it back.
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