So who on here is reporting their steering wheel shake to the NHSTA?

You can hear these RTs, but they’re definitely not MT loud. Barely louder than a worn KO2. I daily the 4R still, and I find these to be a great compromise. Almost went for the AT3, but the sidewall was too tame for my liking.

Snow performance is yet to be determined though.

Those yokos look soo good!

 

My 2023 ORP came with the Bridgestone Duelers. I had a slight shimmy at 62-64 mph. It was not bad enough that I wanted to do anything about it. I replaced the tires with Goodyear UltraTerrains in the stock size at Discount Tire. I needed off-road tires. If not, I would have kept the Duelers. Discount Tire said they did a road-force balance. I have no idea what they actually did. But these tries are smooth as silk all the way up to 80 (have not driven faster). I was not expecting a tire with so much more aggressive tread (than the Bridgestone) to be able to be balanced easily and well. Based on my experience I would infer it is an issue of being able to balance the tire-wheel combo. If you change the suspension, wheel weights, spring stiffness, shocks, etc, you have a different dynamic system than stock. I did a project (rotating imbalance-resonant frequency) in an Engineering class in College (Dynamics). I assembled a precise rheostat speed controlled structural model of a car wheel system with known rotating imbalances. It was a horizontal steel rod being spun about its axis parallel to the ground. It had a disk attached to the end representing a wheel. Attached to the wheel were known mass points (fishing weights-split shot) representing an imbalance. And I used vertical plexiglas (low friction) guides to limit the deflections to vertical only. Without these guides the out of balance wheel would want to displace the shaft in a circular motion. All the components had known dimensions (diameter , length , weight) from which I could calculate the relevant parameters (stiffness, mass, etc). I set up the project in front of a blackboard (1979) with a grid behind it so the class could see the deflections. I calculated the expected vertical displacements (in inches) of the wheel spinning at various rpms. The tests agreed very well. Knowing the mass and stiffness of the system you can predict the resonant frequency (critical speed at which the displacements become unmanageable). I varied the rpm asymptotically approaching from below critical speed with predicted displacements. Then I quickly ran the rpm past the critical speed and had predicted displacements above the resonant frequency. Then I dialed in the critical speed (resonant frequency) and the system displaced so much the shaft bent permanently and destroyed the test. I had an identical shaft, disk and rotating imbalance and put it in the chuck of the motor and repeated the entire test with identical results. What did I learn from all this? Everything matters. If you change ANYTHING the results will change. Damping is a factor. Undamped systems are harder to manage. The shocks impose a resistive force to the vertical movement of the wheel in proportion to the velocity of the movement. When the wheel is not moving up and down the shocks impose no force. It is possible to balance the factory 4 Runner wheels-tires to get smooth , shimmy-free, driving. Mine is one example. Once you change the 4 Runner, it should (could) be possible as well. But it seems to me you could create a system with so many variances from stock that it could be very difficult to balance. Each assemblage of changes can be a unique experiment. I would want to use a known combination that someone already proved can be balanced. The following changes can all affect the ability to get a balanced system: different weight wheels and tires all with an unknown extent to which they are built out of balance? Substitute springs, shocks. Altered suspension dimensions from a diff-drop or lift kit (unless factory lift). Each of these presents a new challenge. Again, go with a combination someone has already proven is able to be balanced. But you can’t complain to Toyota that after changing anything it is their fault. However, it is a very legitimate complaint that the factory wheels and tires Toyota specified , can’t be balanced. I’m guessing some aftermarket wheels may not be made as well balanced as factory wheel options.

 

You sure your tires dont develop a flat spot after sitting? Does it go away over time?

 

I wonder if the fj cruisers had this issue.

 

Nope.

 

All this education and nothing about sentence structure and paragraph formation?

 

Don't get me wrong @rmiked.....I totally agree with what you're saying. I was just making a funny.