Tramlining

[Cactussed]

What causes it (and don't say ruts in the road). Is it to do with sidewall stiffness or shape or somehting else?

Reason I ask is, I have just fitted some new tyres to the rear of 355 and have noticed it sometimes squirms a little now under hard acceleration. Wondering if I am getting tramlining from the rear of the car.

Suppose it may also be down to needing new rear suspension bushes, although I had them checked last week and apparently all OK...

Edited by Cactussed on Thursday 1st July 10:23

[anonymous-user]

Cactussed said:

What causes it (and don't say ruts in the road). Is it to do with sidewall stiffness or shape or somehting else?

Reason I ask is, I have just fitted some new tyres to the rear of 355 and have noticed it sometimes squirms a little now under hard acceleration. Wondering if I am getting tramlining from the rear of the car.

Suppose it may also be down to needing new rear suspension bushes, although I had them checked last week and apparently all OK...

Tyre construction is a big factor as well as your aligment and camber settings. I would experiment with tyre pressures and make sure that the basics are ok first. I would imagine that a 355 running the fairly large tyres that it does would be quite sensitive?

[Cactussed]

Had alignment checked as well. All spot on.
Will re-check the pressures, just to make sure they're OK.

[s3fella]

My 348 was an absolute bugger for it, on the brakes mainly, but I was always of the impression the 355 generally far far better due to the snazzy dampers.

[HellDiver]

Have you driven 500-odd miles to 'scrub in' the new tyres?

[Dog Star]

In my experience it would appear to be down to height of sidewalls (and I bet stiffness).

My old car had 30 profile tyres and tramlined like a bd on motorway lane 1 ruts. Similarly previous cars with similar height sidewalls.
Current car has 30 profile tyres but they are much wider and as a result the sidewalls are higher - car doesn't tramline.

[briers]

Mine is quite bad

Following ruts on the m-way, skipping sideways on bumps in corners, and weaving under heavy braking from high speed on poor road surfaces - all down to wide tyre, low profile and super stiff side walls

[OnTheOverrun]

It can be entirely down to the brand of tyre. Take my Mazda 6 MPS for example - BS RE050A a little bit of tramlining, Falken FK452 lots of tramlining, Hankook V12 EVO no tramlining at all. All XL rated for stiffer sidewalls and all aligned correctly when tyres fitted.

[Cactussed]

Admittedly, I've only done about 100 miles on the new rubber so they may still be slightly slippery. Th rears are 275/40/18 so side walls aren't stupidly small, although they are definitely more vertical than the old Bridgestones.

I'll drive it some more, check pressures and see what happens.

[bazking69]

A number of things, but the biggest thing IMO is fitting massive wheels with wide tyres and tiny stiff sidewalls on modern cars.