Rear end movement over bumps in road

C

Cropperlaa

Member
Im unsure on the best way to describe this. Whilst driving the wifes 2013 sdrive 18i m sport, when accelerating if I go over a bump in the road, it feels like the backend moves slightly like it jumps/jerks slightly to a side, is this an issue we should be worried about? Or is it just a standard roadster thing? I thought it would be quite firm or have substantial grip, has anyone every come across this or got any advice?
 
I get the same occasionally and I thought it was due to the run flat tyres.

A lot of people recommend switching to nom runflats, which are meant to improve the ride.

I’m sure someone will be along to give a better opinion.
 
I get this every once in a while. Just a trait of the car that could probably be solved by better damping imo.

A firm ride and 19” wheels won’t be helping matters in my case at least.
 
Bump steer is just something you get on a car that's too firm for British roads, msport and low profile rft will be the cause of it most probably
 
I bet it happens on long sweeping curves - I can think of one long right hander near me with a slight bump in the road; in fact I now approach it tight on the white line so I don't get off the black stuff and into the ditch when the back end hops. Over the years I've seen the remains of other cars that didn't make it :thumbsdown:

Its not just the Zed that does it I've had other cars with a tight set up an they have done the same - now you know its there you can start to enjoy it :lol:
 
Whether 18inch or 19 it's worth checking tyre pressures . 33-35 psi front / 34-36 psi rear seems to work well but some do run up to 44psi .
Age & tread depth also has bearing as does runflat V standard
Also if you are on 19s the rear 255 30 profile will be doing nothing for the car , comfort or wheel itself :cry:
 
Could be a worn bush somewhere.
My E85 did this and it was worn rear outer upper rose bushes. Just enough play in them that a mid corner bump would change the geometry enough to make the car 'shimmy'.
 
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