Tyres

[Ashley_ng]

Hi all,

A bit of a stupid question but wanted to double check before i purchase new wheels,

Im looking at splashing the cash on some CupRacer alloys which online says the tyre size should be 225/35/19

I am running the stock 5 spoke wheels on a 2019 cupra, i have Michelin PS4S 235/35/19 tyres on,

Would these tyres fit onto the cupracers with them being 225 wheels? If so, would i have any issues with the speedo etc?


Thanks

Ash

 

[BigJase88]

235/35/19 is what you want and what you already have

 

[DigitalSushi]

225 will give you a slightly thinner wheel and slightly less tyre wall.

Basically meaning a little less grip and if the potholes round your way are as bad as round mine you will feel them more with the smaller walls (and i have found more likely to split the tyre wall if you accidently smack a pothole).

It will also slightly mess with your speedo reading, not by much with that change but bear it in mind. here is a decent calculator to show the difference

Tyre Size Calculator

A better easy to use tyre size calculator. Use our tyre size calculator to find tyre diameter, width, sidewall, circumference, and revolutions per mile.

tiresize.com

I would stick with the 235 personally.

 

[cupra14]

I'd also stick with 235 but if you do change (as you probably know) you have to let your insurer know. (They may well not care.)

 

[Ashley_ng]

Thanks for your replies

I would let insurer know as its not worth the hassle if i did need to claim,

Im not sure if ive not worded it well but what i want to do if possible is put my 235 tyres onto the 225 wheels so in theory i should still have the same grip etc?

Thanks

 

[Glosphil]

No such thing as a 225 wheel - that's a tyre width.
Wheels are measured by diameter and width (both in inches) & offset (ET) in millimetres.

 

[DigitalSushi]

You need to check the rim width and the tyre manufacturer spec.

235 really should be on 8 or 8.5 I think, if the rim is narrower then the tyre will be at a slight angle where the bead connects to the rim. It might not seat properly.

Under heavy load this could be dangerous. I wouldn't risk it personally unless the tyre lot say is OK

 

[BigJase88]

Yeah 235 is good for 8" or 8.5" width wheel. Will say 8J or 8.5J. I would assume a 19" aftermarket wheel would be 8/8.5"

Saying that i know Mercedes factory fit 235/35/19 to 7.5J 19" alloys on the Mercedes A Class so it can be done

 

[RUM4MO]

I've noticed this as well, ie any wheel rim width will also have a tyre width "window" associated with it normally giving a range/span of 3 tyre widths, many car manufacturers tend to specify the tyre width that "sits" in the middle of that normally 3 widths tyre window, and others sit bang on the edge of that window, Honda tend to sit on the outer edge - which is what has been said wrt M-B.

I'd always feel happier sticking to what the car manufacturer fits at factory and hopefully spec'd for use during homologation, and so be what insurer's are expecting you to fit/replace with on that wheel size.