Tyre Sizes on TCR

[pixelcellar]

I'm looking to get a 'Winter' set of Reifnitz from CM Wheels or similar that are 19" X 8J 5X112 ET42 as opposed to the standard ET50 genuine wheels.

First question is, will these fit well and not stick out beyond the wheel arch's and second, is there enough clearance for 235/40/R19 tyres, i currently run 235/35/R19 on the genuine ones but loking to try and fill the arch a bit more.

Anyone with a TCR done this or know someone who did? Issues etc.

Obviously as it's lower than a standard GTI as standard i wanted to get some info before making an expensive purchasing mistake.

[Adam T7]

Have you spoken with CM wheels? I mithered them to death re. clearance / bore size / caliper clearance and bolt fit before I purchased the 19” ‘Pretorias’ a few months ago. Fit is perfect with zero issues. I know you are fitting a different wheel, but the knowledge and customer service at CM is spot on.

[SRGTD]

@pixelcellar - Below are the results from the calculator on www.willtheyfit.com of fitting the wheel/tyre combination you’re proposing to fit compared to your existing wheel / tyre setup;



You’ll see that fitting tyres with a higher sidewall height increases the radius and circumference of your car’s wheel / tyre combination which will result in a speedometer error; with your proposed setup the speedo will under-read by 3.6% so the indicated speed displayed will be less than the true speed being travelled. I’m assuming you’re in the UK - be aware that from a legal perspective in the UK, while it is permissible for a car’s speedo to over-read by up to a pre-defined margin, it must not under-read by any amount (presumably to stop drivers unknowingly exceeding the speed limit) - see article at the link below;

https://www.thecarexpert.co.uk/how-accurate-is-a-car-speedometer/