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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 20605
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Have just bought 2011 ford focus titanium 125 auto. Lots of

Customer Question

Have just bought 2011 ford focus titanium 125 auto. Lots of tyre noise and very bumpy suspension. Found 3 tyres vastly over inflated. Set correct tyre pressures but still noisy, thuds into the least hole and on what looks like a decent surface can feel like a cattle grid. 12 mile journey is sick making. Can't be right or they would never sell any cars. Have tried taking out traction assist but makes no difference (If it is coming out) Please help this old man as havn't had a car younger than 2004. Yours *****@******.***.
Submitted: 1 year ago.
Category: Car
Expert:  Shantal-Mod replied 1 year ago.
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Expert:  Matt replied 1 year ago.
Hello

as you've already checked tyre pressures its also worth making sure that the suspension geometry is correct as if a camber or rear toe setting is out then this would make the car feel nervous,

I'd recommend taking the car to a place that does 4 wheel suspension alignment, most places use the back wheels as a datum and assume that they are perfectly straight and true. Often this is not the case and many modern cars are now adjustable at the rear as well as the front.

A 4 wheel alignment measures all four wheels independently and each is set -up without referring to each other and should only cost around £40.

If looks Ok then I'd consider fitting a taller profile tyre with a smaller diameter wheel, this will add some compliance to the ride and generally calm the quick responses. An alternative is to keep the current wheel and replace the tyres with some of a softer sidewall so removing some of the compliance in the system - Toyo's for example

This is especially true if you have run-flat tyres currently fitted

If you look on the tyre at the end of the number eris there's a letter the number just before this letter denotes the load capacity and therefore sidewall stiffness.

ie 225/55 R16 91V its the 91 you're interested in try a tyre with a lower figure and you'll get a softer tyre, however bear in mind this will also soften the steering response

Its also worth checking that all the main suspension pivot points have been tightened with the car on its wheels not in the air as this can add a lot of friction to the suspension and lastly check that the brakes aren't binding at all as this too can make the ride very jerky and bouncy

Customer: replied 1 year ago.

It is not twitchy it just runs as if on solid tyres with no shock absorbers and is already on the smallest wheels they do for this car. It can not be right or none of these cars would sell.

Expert:  Matt replied 1 year ago.
OK

try checking the suspension mounting points as the nex step as I mentioned as the last point in my previous reply

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