I don't know yet, had them fitted this evening..Does it look any different?
Next day I had to go other fitter, as I tried to air all tyres at tesco pump but i couldn't remove metal valve cap on one old tyre. I purchased metal caps from aliexpress so they got all rusty.
It will also make your speedo inaccurate I would have thought as the amount of wheel rotation would now equate to a different distance moved.If you change the aspect ratio of your tyres you will directly affect your gearing by changing the rolling radius. Going from 35 - 40 % aspect ratio (not width !!! this is NOTHING to do with your wheel size!) will increase your rolling radius therefore lower your gear ratio, whilst for your mother this may not be a bad thing it will definitely involve slipping the clutch more on take off but lower the rpm at cruising speeds , again for your mum maybe not a bad thing!
There are many web pages which will calculate this for you and draw images of the changes for you, but at the end of the day it all comes down to feel.
One good thing, is that a higher side wall will protect the rims a little.
In my experience the ride in all A1's is go-kart like.
You will either have to see if your friendly tyre dealer will have them back - 0r buy two more for the the other end.Quick question my wee mums A1 has 225/35/18 fitted to it but Speed Test needs the 2 front tyres replaced asap l am in the train of thought to change them to 225/40/18
The ride quality is intolerable with a 35 profile
The price of 225/35/18 are a rip off they are actually the same price as my S3's 235/35/19 and in some cases brand dependent even more expensive car has only covered 6700 miles in 3 years and the Conti's are ******** already dreadful tyres had them on my previous S3
The dimensions for the 2 tyres are :-
View attachment 251527
Why would you want to do this?
have you got some cheap tyres? do you want to protect your wheels?
You need to consider:- handling changes, speedo errors, gearing ratios, clutch life, TPSM settings. the increase you are considering is outside the normally recommended 3% increase.
Have a look here : https://www.parkers.co.uk/what-is/tyre-sizes/
or here : https://www.tyresizecalculator.com/
Put your car in your signature then you wont have to say it every time you post