Pulsing high speed vibration, wheels, drivetrain, idk

As conformation I will post some pictures next week of the chain/rotor movement and the old axle wear. I very much hope this helps in the future.


Also as an fyi. I posted previously that the pulses changed when I installed slip-ons. It seems, as someone previously pointed out that the pulsing is infact harmonic in nature. Some may notice that the engine even feels rough or uneven when your chain is dry or worn. Same is true with worn tires.

I've had a unique opportunity over the last few months to observe and try many different combinations due to the unusually high mileage I ride. Currently aprox 200-300 miles a day. Needless to say I've made many changes and adjustments to observe changes.

The most important take away I have is the fact that it's near impossible to determine what's front vs rear. Looking back and taking into consideration the principles involved it makes sense that your apt to feel everything amplified in the bars and little in the rear.

Its very worth noting that I'd very much recommend everyone check and adjust thier sag. I cant even tell you the night and day difference. I've always relied on making the adjustments to keep the belly pan parallel to the ground with me on the bike but once I set it per spec following dave moss tunings guidelines the handling and stability improvements made the bike feel a new beast. I had already upgraded to the full DMR suspension but oh boy! Even 10mm out front or back amplified any tire wear and certainly all my issues in the rear end.

 

Now, the only issue I have yet to resolve is my front tire wearing on the sides but not the center. Wear is even but I do 99% thruway riding. Little if any hard corners and my rides are 80-90mph straight line. I'm currently looking at tire pressure. I've alway run 36/42 and all 3 rear and 5 fronts have been Q3+ as I wanted to be able to see how various upgrades, repairs, and changes affected tire wear and life. Plus I do occasionally exceed 120mph for sustained periods and felt more confident in a hyper sport tire.

I'm starting to wonder if running them a few psi lower, perhaps at the cannon riding pressure. Would give me more even wear, I'm wondering if because of high pressure the tires are not heating up and scrubbing instead of flexing. Interestingly my friends all run the q3+ on both heavier and lighter bikes, all of which call for 42/42 and no scalloping, always even wear, even in older bikes with completely worn suspension and not setup correctly. I did try 42 front and it didnt seem to matter.

I may contact dunlop for information.

 

Now, the only issue I have yet to resolve is my front tire wearing on the sides but not the center. Wear is even but I do 99% thruway riding. Little if any hard corners and my rides are 80-90mph straight line. I'm currently looking at tire pressure. I've alway run 36/42 and all 3 rear and 5 fronts have been Q3+ as I wanted to be able to see how various upgrades, repairs, and changes affected tire wear and life. Plus I do occasionally exceed 120mph for sustained periods and felt more confident in a hyper sport tire.

I'm starting to wonder if running them a few psi lower, perhaps at the cannon riding pressure. Would give me more even wear, I'm wondering if because of high pressure the tires are not heating up and scrubbing instead of flexing. Interestingly my friends all run the q3+ on both heavier and lighter bikes, all of which call for 42/42 and no scalloping, always even wear, even in older bikes with completely worn suspension and not setup correctly. I did try 42 front and it didnt seem to matter.

I may contact dunlop for information.

 

You are clearly focused on finding and correcting the problems. I admire your patience. I've heard it's not easy or fun to replace the rear bearings. I noticed when they took the old Michelins off the bike the rear looked pretty good but the front is scalloped as hell. Most of my riding is cornering and I weigh 230 lbs so maybe that's why. I've been running the recommended tire pressures.

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The tire pressure recommendation is for the original OEM tires, which may have stiff sidewalls (e.g., Bridgestones). IMHO 36 psi is marginally too low for any tire. I'd go 40F and 40-42 rear on a VFR. A PR4 is fairly soft with sidewalls, those need to be inflated more than the swingarm sticker says.

 

Thanks. What's a PR4?

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Ah, just figured it out. They are Road 5's.

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PR4 is Pilot Road 4

 

Right. But the tires in the pix are Road 5's.

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Having followed this post from its birth. I may suggest that you let someone else gave a go on your bike n see if they can come up with anything. To me it beginning to sound like “Triggers broom”.