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Old 03-28-2011, 09:02 AM   #1
JJJZJ OP
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Slow speed vibration on deceleration

I cant get the search to work here, but has anyone ever run into the problem I am having where their bike(mine is a 2010 F800) develops a slow speed vibration on deceleration? It seems to occur from 25mph - 18mph. I can feel it run through the entire bike. It has me slightly worried that the problem might the wheel bearings possibly as I am slightly paranoid thanks to this forum

It might occur at acceleration, but I cant tell with the engine doing its thing...

Initially I thought it might be the tires I put on, but it feels more pronounced as time goes on. Its not bad to live with, but I just want to avoid catastrophe if possible. The bike has about 12k miles on it right now.

Thanks for any ideas!
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Old 03-28-2011, 10:23 AM   #2
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Just a thought.
I've had several bikes do this but at a slightly higher decell speed, 45-20.

Carefully try this.
With a very, very light hold of the hand grips... Is the steering head shaking upon decell?

If so, adjust or replace the steering head bearings.
If the stock bearings are ball, replace with tapered roller if avalible.

Inexpensive bearings are sourced from China, like all balls.
Use quality bearings like USA, German, etc. sourced.
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Old 03-28-2011, 05:57 PM   #3
johnparjr
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Mine does that on my new shinko's from 20-25mph then goes away for me I just figured it's the block pattern on the tires.
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Old 03-28-2011, 06:44 PM   #4
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I cant remember if mine did it with the stock pirelli scorpion tires, but i have Shinkos on there currently as well. I think they are the 705s?
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Old 03-28-2011, 07:35 PM   #5
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My 800 tended to have that deceleration vibration ending in an increasing front wheel wobble. It seemed to worsen when heavily laden and with top box.

Tangohopper's R1200gs adventure does the same thing.
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Old 03-30-2011, 11:11 PM   #6
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Put the bike up on the centerstand; add enough weight to the rear wheel to lift the front tire/wheel off the ground and spin the wheel. Does the wheel, tire or brake rotor seem to wobble. That can point to the one causing the problem Re the steering head bearing, in my experience is unless it gets notchy if you slowly move the bars side to side, with the wheel up, it's something else.

Note if the tire is out of round that ought to be visible when spinning the wheel. I have never had a new tire go out of round, but I never bought one made in China either. Dave
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Old 03-30-2011, 11:17 PM   #7
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Shinko's are S Korean not Chinese
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Old 03-30-2011, 11:33 PM   #8
Tosh Togo
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Quote:
Originally Posted by johnparjr View Post
Shinko's are S Korean not Chinese
Who cares?...the bike's German.

The way thngs are going, it'll be a part of southern China in a few years anyway.
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Old 03-31-2011, 04:02 AM   #9
swimmonkey
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Vibes

Have the same thing when I run TKC 80's. When I run Metzler Tourance, it goes away.
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Old 04-04-2011, 02:52 PM   #10
KuRi
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I have a similar problem on mine. I notice it too when keeping the speed at ~20km/h, with a very small gas usage.

The thing is that I notice it only on the left side of the bike :(
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Old 04-05-2011, 05:37 PM   #11
johnparjr
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Mine is starting to fade so Im assuming it's the block pattern of the tire which is now getting worn down after 800 or so miles the vibration is almost gone.
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Old 04-05-2011, 05:38 PM   #12
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Quote:
Originally Posted by Tosh Togo View Post
Who cares?...the bike's German.

The way thngs are going, it'll be a part of southern China in a few years anyway.
Because everyone likes to Bash shinko tires even though they have probably never had a pair on.
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Old 04-05-2011, 06:01 PM   #13
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They were cheap and there are so many mixed reviews on here that I gave them a whirl.
3500 miles later with a trip to Baja and rear ending a chevy pickup under their belt with no flats or failures, Im sufficiently impressed.

Wish I could say the same for those junk ass Pirelli(read: fancy Italian) tires that came on the bike.

Ill keep an eye on the vibrations, but will just assume its due to the tires tread pattern.
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