Rim width question about tyre width max/min

[OJ9693]

I'm looking for some alloys and the current tyres i have are almost brand new so i wish to just purchase alloys and do a straight swap.
I've found some alloys on Ebay but the rim width is 7" where as my tyres are 225 (7.5J) which is what i was originally looking for but these are really nice.
According to this pic below, 225 is the maximum limit and ideal is 205/215. I was just wondering if there are any pro's and con's to fitting these.

Any advice is more than welcome, and appreciated.

Thanks.

 

[LouG]

The only con might be slightly mushier turn in from the sidewalls being squeezed onto the narrower rim. Higher pressures may help. Or you might not notice any difference.
But it seems they will fit and aren't illegal.

 

[RUM4MO]

One thing that I had not considered in the past is the effect that rim width makes to the rim protection afforded by a tyre that already has built in rim protection. My daughter bought a set of alloy rims for winter tyres, I suggested 7.5J for the 225 section tyres - she bought 8.0J fitted with 225 section tyres, these are the first wheels/tyres I've ever handled that when you stack them, the rims touch instead of the rounded walls of the tyres touching.

From the rim width versus acceptable tyre widths tables, 8.0J is okay for 225, as is 7.5J, but from what I've seen, when considering rim protection, the 7.5J rim is th e better choice.

Edit:- in answer to your question, I'd only go for 7.5J for 225 tyres as a very good balance between having an upright side wall and one that is bulging too much.

 

[OJ9693]

One thing that I had not considered in the past is the effect that rim width makes to the rim protection afforded by a tyre that already has built in rim protection. My daughter bought a set of alloy rims for winter tyres, I suggested 7.5J for the 225 section tyres - she bought 8.0J fitted with 225 section tyres, these are the first wheels/tyres I've ever handled that when you stack them, the rims touch instead of the rounded walls of the tyres touching.

From the rim width versus acceptable tyre widths tables, 8.0J is okay for 225, as is 7.5J, but from what I've seen, when considering rim protection, the 7.5J rim is th e better choice.

Edit:- in answer to your question, I'd only go for 7.5J for 225 tyres as a very good balance between having an upright side wall and one that is bulging too much.

Thinking about it some more i'll probably stick to looking at 7.5J then, better to have that bit of protection eh!

Thanks a lot!

 

[sweetfr]

The standard fit alloys on my 2019 fr are 7" by 17" with 225/45/17 tyres. I put 8" by 18" alloys with 225/40/18 Goodyear f1 Asy 5 tyres and the rim protection is good. I think rim protection depends on which brand of tyres you fit.

 

[RUM4MO]

The standard fit alloys on my 2019 fr are 7" by 17" with 225/45/17 tyres. I put 8" by 18" alloys with 225/40/18 Goodyear f1 Asy 5 tyres and the rim protection is good. I think rim protection depends on which brand of tyres you fit.

Either you were lucky with your choice of alloys or my daughter was unlucky with her choice of alloys - her aftermarket wheels are Autec Wizard.

 

[OJ9693]

The standard fit alloys on my 2019 fr are 7" by 17" with 225/45/17 tyres. I put 8" by 18" alloys with 225/40/18 Goodyear f1 Asy 5 tyres and the rim protection is good. I think rim protection depends on which brand of tyres you fit.

These are the the same dimensions as mine then. I don't wish to buy new tyres as mine are brand new from the dealer when i bought it.

I've found another pair and cant work out the offset difference. My current offset says it's 51 but these alloys i have found are 43, would that be much of a problem? i understand it could rub on the wheel arch but would that not be a negative offset which would cause that?

 

[RUM4MO]

But the listed ET is negative, so 43 will move the outer edge 8mm further out towards the edge of the wheel arch than 51mm.

 

[OJ9693]

But the listed ET is negative, so 43 will move the outer edge 8mm further out towards the edge of the wheel arch than 51mm.

I've just had a brain wave and i actually understand it now DOH.

What would be an easy way to check an offset of 43 would fit and be legal on my car?
As the alloys are on ebay i don't want to purchase them for them to eventually not fit..

 

[RUM4MO]

Google "wheel and tyre combinations" or include "width" - there are tables schematics to keep you right.

Edit:- https://www.willtheyfit.com/
https://www.wheel-size.com/calc/
https://www.tyresizecalculator.com/tyre-wheel-calculators/tyre-size-for-rim-size-width-calculator

 

[OJ9693]

Google "wheel and tyre combinations" or include "width" - there are tables schematics to keep you right.

Edit:- https://www.willtheyfit.com/
https://www.wheel-size.com/calc/
https://www.tyresizecalculator.com/tyre-wheel-calculators/tyre-size-for-rim-size-width-calculator

Perfect, really appreciate it.