2018 GSA Vibration

[Edventure]

Currently touring Spain on my 2018 GSA. Had 700 miles on the clock at the start.

Had TKC 70s fitted along with new rear wheel when a few of us went through the loose spoke saga. Since then haven't done much with the bike until this trip.

Over 70 mph it's vibrating like a b'stard but smooth under that speed. (Please don't tell me to ride under 70mph....)

Any ideas? Could it be tyre balance?

Thanks in advance

 

[Tractors are go]

Does it get a lot worse faster you go ?

Easiest/quickest way, make sure rear caliper isn't dragging then spin wheel, mark lowest point with chalk, repeat until you see pattern.

Also, if wheel was balanced previous, check you haven't list weights.

Finally, get it on centre stand, ticking over in first, and check tyre isn't out of round.



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[Edventure]

Does it get a lot worse faster you go ?

Easiest/quickest way, make sure rear caliper isn't dragging then spin wheel, mark lowest point with chalk, repeat until you see pattern.

Also, if wheel was balanced previous, check you haven't list weights.

Finally, get it on centre stand, ticking over in first, and check tyre isn't out of round.



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Cheers!

Yes, gets worse faster I go...it's like holding a pneumatic drill at 80+....
Wheel weights look like the originals but couldn't be sure. Will put it on centre stand in the morning. Pretty sure it's coming from front wheel.

 

[Tractors are go]

If, you've been off road; check all suspension bolts are tightened correctly too.



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[Edventure]

Cheers I'll check all the suspension tomorrow

 

[fredaroony]

Did the tyre fitter dynamically balance the front tyre or only static? I had this issue where I would get a 1cm oscillation in the handlebars which got worse the higher the speed. Static balance is sometimes not good enough

 

[Oldrat]

Check the bead around the rims and that the tyres are seated corrected, a tyrewall might just have been pinched by the rim

 

[Alan R]

Did the tyre fitter dynamically balance the front tyre or only static? I had this issue where I would get a 1cm oscillation in the handlebars which got worse the higher the speed. Static balance is sometimes not good enough

I watched a technician balancing wheels at the TT one year. He stuck the various weights in place temporarily with a bit of gaffer tape until he was happy he’d got the right ones. He then stuck them on permanently with the weights own backing tape. If static balancing is good enough for MD then it’s probably good enough for a GSA.
Alan R

 

[fredaroony]

I watched a technician balancing wheels at the TT one year. He stuck the various weights in place temporarily with a bit of gaffer tape until he was happy he’d got the right ones. He then stuck them on permanently with the weights own backing tape. If static balancing is good enough for MD then it’s probably good enough for a GSA.
Alan R

Until it isn't....you may have noticed I used the word "sometimes".... Love how you used some anecdotal evidence of you watching some random tyre fitter as proof that static balancing is good enough.

Funny how wheels come dynamic and static balanced from the factory, perhaps they are wrong too?

 

[TBates]

Sound like tyre imbalance to me


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[Robbo1200ADV]

Sound like tyre imbalance to me


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I concur

 

[ianran]

Buckled front wheel?
Mine was, straight from the dealer, so much for their pre-delivery servicing !

 

[Alan R]

Until it isn't....you may have noticed I used the word "sometimes".... Love how you used some anecdotal evidence of you watching some random tyre fitter as proof that static balancing is good enough.

Funny how wheels come dynamic and static balanced from the factory, perhaps they are wrong too?

you may have noticed that I used the word “probably”. Michael Dunlop’s “random tyre fitter” seems to know what he is doing and seeing MD’s bike with that tyre screaming past at nearly 190 mph makes me think that static balancing is “probably” effective.
I have no idea how they balance wheels in the BMW factory and also don’t know if they employ humour while doing so.
I merely offered an alternative opinion - much like yours is also an opinion. I was not my intention to declare war on your opinion and provoke a snarkey offended response.
I believe that you might consider being a little less offended in contributions.
Again, only my opinion.
Alan R

 

[Tractors are go]

you may have noticed that I used the word “probably”. Michael Dunlop’s “random tyre fitter” seems to know what he is doing and seeing MD’s bike with that tyre screaming past at nearly 190 mph makes me think that static balancing is “probably” effective.
I have no idea how they balance wheels in the BMW factory and also don’t know if they employ humour while doing so.
I merely offered an alternative opinion - much like yours is also an opinion. I was not my intention to declare war on your opinion and provoke a snarkey offended response.
I believe that you might consider being a little less offended in contributions.
Again, only my opinion.
Alan R

Dynamic balancing is quicker than static, but if you have the time and expertise is as accurate.

Sadly, few people check the wheels for trueness and balance, then again with discs fitted and finally before fitting the tyre.

The likelihood is that this will have been done prior to IOM TT, also the tyres available will have been selected and checked too, so they are the best available.

All this costs time/money and isn't really justifiable for the average track, let alone road rider. But where it can give even 0•1 second per mile then it is worthwhile, at longer races like the TT.

Whilst you are all agog, unless you have a dynamic balancing machine in your back pocket (unlikely on holiday) then static at least is going to give you an indication of any possible problem.

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[DC]

if it didn't do the shakes before the wheel was replaced, its more than likely something to do with that.as above will be a tyre issue ....friday pm tyre fitting at BMW was it ?

 

[fredaroony]

you may have noticed that I used the word “probably”. Michael Dunlop’s “random tyre fitter” seems to know what he is doing and seeing MD’s bike with that tyre screaming past at nearly 190 mph makes me think that static balancing is “probably” effective.
I have no idea how they balance wheels in the BMW factory and also don’t know if they employ humour while doing so.
I merely offered an alternative opinion - much like yours is also an opinion. I was not my intention to declare war on your opinion and provoke a snarkey offended response.
I believe that you might consider being a little less offended in contributions.
Again, only my opinion.
Alan R

Your whole response was snarky and ill informed. I imagine this is common for you....

Your opinion was based on dribble and you clearly don't understand how tyres are balanced and what dynamic balancing means. You are now trying to back peddle and say you mean't probably but that is not what you really mean't when you wrote this "If static balancing is good enough for MD then it’s probably good enough for a GSA."

You offered no solution to the OP's issue and only made the post to put down my comment. Have some pride and admit when you're wrong.

While my comment may not be the root cause of this actual issue, it is 100% a possibility and can create issues just like what the OP described.

 

[Alan R]

Your whole response was snarky and ill informed. I imagine this is common for you....

Your opinion was based on dribble and you clearly don't understand how tyres are balanced and what dynamic balancing means. You are now trying to back peddle and say you mean't probably but that is not what you really mean't when you wrote this "If static balancing is good enough for MD then it’s probably good enough for a GSA."

You offered no solution to the OP's issue and only made the post to put down my comment. Have some pride and admit when you're wrong.

While my comment may not be the root cause of this actual issue, it is 100% a possibility and can create issues just like what the OP described.

OK, you’re 100% right, I’m 100% wrong. Content now? Good.
Alan R

 

[masterman21]

Maay well be the TKC70's . I had them fitted to a 2014Gsa. One set replaced under warranty and threw the replacement set off after a couple thousand miles.! Not good at highspeed and front was decidedly dodgy on uneven tar !