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UKAFD001



Member Since: 26 May 2025
Location: United Kingdom
Posts: 2
 
Replacing 235/85/16 with 265/75/16
Hello - I’m looking for some advice.

I have recently replaced my 235/85 A/T tyres with 265/75 M/T (cooper STT Pro)

I understand that increasing the width of the tyre and the M/T tread will cause more noise and vibration however It seems to have increased dramatically since I made the change…

The car becomes unbearable to drive past 40MPH and I’m worried that I haven’t adjusted anything to accommodate the new tyre size. Is there anything obvious that I am missing? I don’t want to drive and all of a sudden something snaps Shocked

Thank you
Post #1068456 26th May 2025 8:52am
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BrickBox



Member Since: 05 Oct 2021
Location: Wales
Posts: 1001
Wales 2008 Defender 110 Puma 2.4 USW Zermatt Silver
Are they brand new tyres? And did you get the wheels balanced?

I’d say to start with getting the wheel balance rechecked, If so. 2008 2.4 110 Utility Station Wagon XS.
Post #1068462 26th May 2025 9:55am
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UKAFD001



Member Since: 26 May 2025
Location: United Kingdom
Posts: 2
 
They are not new but all have same tread (roughly 12mm) all round.

There are a lot of balancing weights (sorry if I named them wrong, but the weights on the inside of the alloy which are applied once the wheel goes through the balancing machine)on the alloys however there were a lot of weights on the original wheels.

I’m going to take it back to the shop and get looked at again but was curious if it’s affecting the drive train at all or if I need to adjust something around the wheels
Post #1068469 26th May 2025 11:30am
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DSC-off



Member Since: 16 Oct 2014
Location: North East
Posts: 1485
United Kingdom 2015 Defender 110 Puma 2.2 XS CSW Aintree Green
With the tyre change you've taken a few steps that make things worse than before, all at the same time.
1) All Terrain to Mud Terrain. A more aggressive tyre tread that will make more noise and increase rolling resistance.
2) Wider tyres. More noise, more rolling resistance, reduced fuel economy.
3) Heavier tyres. Due to the construction and size increase.

The other thing is Cooper STT Pro were never known for being a quiet tyre, even when new. Wear will increase the noise, especially if it is uneven on big block treads.
If the set you have are 'used', have they worn according to the direction they were originally fitted, and are now running in the opposite direction making things seem worse?
Post #1068476 26th May 2025 1:53pm
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