Gen 6 Swaybar diameter

Hello,

Does anyone know if the Gen 6 models all have the same diameter swaybars or do the versions with the swaybar disconnect option have a larger diameter swaybars installed (like the KDSS version used to have) offering better on road and offroad handling?

Thank you

 

Not sure if this is the answer you are looking for, but the diameter is just one parameter for the design and irrelevant by itself.

In the overall design of the suspension system, look at the sway bar as a “helper” torsion spring to augment the coil springs on the roll axis only. There is no effective spring when the suspension compresses and extends in unison (e.g. “nose dive”) The distance from the frame connection to the control arm connection is a lever acting on the torsion bar; this contributes to the effective spring rate as much as the diameter.

 

Then let me ask the question in a different way: Is there a significant difference in “on road” handling, more specific body roll, between the models with the swaybar disconnect option vs the ones without.

 

Assuming the sway bars are connected, the on-road handling manners will be consistent with the intended design… for example, a Limited will probably have less body roll than a TRD Pro. Engineers design/“tune” the suspension as a system with an intended purpose.

sway bar disconnected is intended to allow maximum suspension articulation off-road and would have significantly more body roll on road.

not sure if that answers your question.

 

The lever arm of the swaybar is something I hadn’t thought of, but that makes perfect sense.

I would expect that the lever arm length would be the same on disconnect-equipped models vs standard models, but that’s an
assumption that would need verifying.

It would make sense if Toyota decided to make thicker swaybars for disconnect-equipped models. Which is what they did with kdss.

On Tinkerers recent LC250 video he mentioned that it was very floppy in turns. It’s got a disconnect, so that implies that even if it is thicker, Toyota didn’t seem to have tight on-road handling as a goal for the LC250. However, it’s not a good idea to assume this applies to other models…there are so many differences between trims and models with this new generation of trucks, that you’d probably have to verify equipment/specs for every single trim and option package.

 

Test driving the offerings yourself might be the most direct way to assess. (Check tire pressure and acknowledge different tires can make an impact)

 

Unknown because Toyota stopped publishing 4R sway bar diameters in press kits after 2024...

Doug Demuro's review mentioned the 6th gen now handles like a unibody SUV, so the suspension roll rate may be noticeably higher than 5th gen.

The only Youtuber who measures sway bar dia. is Sarah-N-Tuned. Unfortunately both the 4Runner Trailhunter and two Tacoma TRD ORs she reviewed had SDM, and all three had the same front sway bar dia. of 34mm.

 

the LC250 being a hybrid is also quite a bit heavier than gas only trims of 4Rs, so that's another variable, heavier vehicles will have more body roll given an identical sway bar set up.