[Yurymia]

Good afternoon, Gentelmen! I need your advice because I am not sure what to do.

I put a new tires (front and rear) to my MT-09 2019.
Balance was made and it was 75g on each wheel.

The problem when I drive higher that 90 mph. Bikes starts to shakes VERY BAD. However I can reduce this effect or even stop it by pushing the nahdbar with my weight. I had similuar issue when I just bought a bike but it dissapered in few weeks. I have a question. What you think is the issue?

I don't have a damper and the vibration might be caused by new tires. point of contact is small, tures vyre sensitive for any handlbars reactons and the result is vibrations, in this case it will probably should dissapear shortly.

Or the problem is in tires itself and I have to change it


Thank you

 

[meinschaft]

When the bike did this new, did you have your dealer check it?

 

[MK3Brent]

What air pressure are you running, and what tires?

 

[Yurymia]

When the bike did this new, did you have your dealer check it?

yes. but when i came to dealership in two weeks after. this problem disapered... and they didn;t find anything

 

[Yurymia]

What air pressure are you running, and what tires?

39 psi
will text full tires model shortly here

 

[MK3Brent]

@abe57 had some head shake with S22 tires recently.

Just curious if you had the same:

Bridgestone front S22 = head shaking at and above 121mph

First time with the S22 never a problem with the S21 . I get head shaking starting at 121mph ,removed wheel from the bike released all air by removing valve core ,bounced the tire all the way around the rim ,had 32 psi now going to try 33 psi. Rechecked ballance all is good there. Everything is...

www.fz09.org

 

[Yurymia]

39 psi
will text full tires model shortly here

Bridgestone Battlax Hypersport S22 Tires

 

[MK3Brent]

Bridgestone Battlax Hypersport S22 Tires

So in this case, it's the same tire and similar problem.
Try changing the tire pressure like Abe did, and see if there's a difference.

 

[Yurymia]

@abe57 had some head shake with S22 tires recently.

Just curious if you had the same:

Bridgestone front S22 = head shaking at and above 121mph

First time with the S22 never a problem with the S21 . I get head shaking starting at 121mph ,removed wheel from the bike released all air by removing valve core ,bounced the tire all the way around the rim ,had 32 psi now going to try 33 psi. Rechecked ballance all is good there. Everything is...

www.fz09.org

So in this case, it's the same tire and similar problem.
Try changing the tire pressure like Abe did, and see if there's a difference.

THNAK YOU.
SO YOU RECOMENDATION IS TO PLAY WITH AIR PRESSURE AND SEE WHAT IT IS?

 

[Yurymia]

I will try to do it today.

 

[Yurymia]

thank you gentelmen!

 

[Moto26]

Try 32-34 psi front, and 34-36 psi rear. Should make a difference (and a more comfortable ride, as well)...

 

[Yurymia]

i will try it today and right here. but a silly question. i found on a tire that cold pressure required is 42psi. why so?

 

[Moto26]

That’s the maximum pressure that you can run in the tire, when the motorcycle is loaded to its maximum capacity. So if you were carrying a passenger and a load of luggage, you would want to put 42 psi in the rear.

This causes a lot of confusion (and arguments) for people, but the maximum PSI listed on a tire is almost never the optimal pressure to run in normal conditions...

 

[Yurymia]

Thank you very much for detailed explanation and answer

 

[Weeksy]

Try 32-34 psi front, and 34-36 psi rear. Should make a difference (and a more comfortable ride, as well)...

Yeah that's about where i'd be for the road with S22's. I've run loads of S20s and S21s but never a newer S22s yet.

PBTD Blue Inters Group Gallery 2

www.edpphoto.com

PBTD Blue Inters Group Gallery 2

www.edpphoto.com

That was S20s at the weekend

 

[abe57]

I am now running cold 33.5 psi front and 34.5 psi on the rear with the S22 and have not had a problem since ! And I am 170 lb with out gear !

 

[Yurymia]

Try 32-34 psi front, and 34-36 psi rear. Should make a difference (and a more comfortable ride, as well)...

ok. I have done what you advices.
I put 33/35 (front rear) an I have to say that situation improved significantly. Now vibration starts after 100+ and not always. And now I am even more confused....
I can't understand is it something wrong with tires or this vibrations because of my bike itself and no steering wheel damper....

So, first of all, thank you all for advices. Special thank to Moto26.

And next question now, what would you reccomend to do... to forget about it/to reduce pressure more/to change tires/to wait and observe more???

 

[Weeksy]

YOU can easily go as low as 30/30 and all it will do is turn a little slowly, nothing more than that... Give it a go, it won't do any harm

 

[Yurymia]

I wanted to thank everybody!
I tried 30/30 but it was a lot of vibrations after 100+
So, I decided to change tires. I put Michelin Pilot 5 and 36/40 and it rides perfect. Super stable. I made 137mph and it was no any issues.
So maybe s22 not for mt-09 or it was defected tires..