Help with Front Wheels

[Fly2High]

What tire are you mounting? If it is on the larger side, at the very least the tire will rub.

If it were me, I would get a bigger spacer. It looks close.

Since you know some measurements, enter the wheel, spacer and tier into this calculator(https://www.tire-size-calculator.info/ ) and see if it will be wider. You might even be able to measure from the hub face and see if the tire could rub

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[AnthonyL]

What tire are you mounting? If it is on the larger side, at the very least the tire will rub.

If it were me, I would get a bigger spacer. It looks close.

Since you know some measurements, enter the wheel, spacer and tier into this calculator(https://www.tire-size-calculator.info/ ) and see if it will be wider. You might even be able to measure from the hub face and see if the tire could rub

Already have a 5mm spacer. From my understanding that's the max allowed before needing studs plus it looks perfect flush with the fender so would rather not. As for tire rack recommends a 255/40 so either that or was thinking a 275. I'm kinda thinking it should work long as my tire doesn't bulge out correct?

 

[Fly2High]

If I understand that you have a PP1,
Stock is:
Tires
Front: 255/40R19
Rear: 275/40R19

Wheels
Front: 19 x 9 ET45
Rear: 19 x 9.5 ET52.5

To be blunt, a 19 x 10 ET45 tends to be listed as a rear wheel. You want to put a rear wheel on he front. Personally, I would return it. It doesn’t fit IMHO and I personally prefer not having spacers that you can look online what he downsides are.

That said, I would at least look to put the wheel and 275/40R19 tire in about the same place as either the stock wheel’s inside edge (255/40R19) or no further back than say the PP2 wheel puts the 305/30R19.


When comparing to he original stock 255/40, I plugged in the 19x10 wheel with the 275/40R19 tire and found out that you need a 15 mm spacer to get the same gap between the struts that the stock tire had.

If you wish to compare to he fitment of the PP2 with a 19x10.5 ET24 wheel with its 305/30R19 tire and figured that is bigger and must be closer, you are right. Except they use the smallest offset of 24mm to push the wheel and tire further away. To get the same gap as the PP2 wheel and tire but using your 19x10ET48 wheel and 275/40R19 tire, you will need a 19-20mm spacer.

Personally, if you cannot return the wheel, sell it or bite the bullet and have some longer studs installed and buy the correct spacer. I would rather sell that wheel and get a wheels that fit without spacers

 

[Fly2High]

Let’s also look at it another way.

If the original wheels were 19x9ET45, measure how much room they have between the tire and strut . Make sure you turn the steering wheel and measure at the limits of steering too.

Now you want to add 20mm of tire width and move it closer to the strut by 3mm additionally. If you have more than 23mm of space between the stock tire and strut, I would think it would be ok. I would also measure while there is weight on the tire since compressing the spring/strut could change things. I would add a little fudge factor as well so 30mm would make me feel better.

 

[NightmareMoon]

Yes, this is going to work ... as long as you don't pick a tire that's too wide in the section width. So, the _inside_ of your 19x10" wheel from lip to lip is ~10" wide, and the outside edge of that lip that's closest to the strut is a little wider, and looks it like you have about ~5mm of clearance to the strut. As long as the section width of your chosen tire is not any bigger than ~11.4" you should be good. (make sure the section width was spec'd on a 10" wide wheel, Tire Rack's tire specs will tell you the wheel width the section width was measured on).

A 285 tire is approximately 'square' to a 10" wide wheel (it depends on the specific tire, since tire width specs vary a bit from manufacturer and tire to tire). The critical tire spec dimension for you now is called Section Width, and it is relative to the wheel width, but the tire specs (on TireRack.com) should tell you how wide the section width of any given tire is when its mounted on the most appropriate sized wheel.

Now for some real actual data: I measured an 11" RE71R with a 305 tire (which is a pretty square width match to the wheel) and that tire, which has a very stiff and flat sidewall only protruded <2mm past the wheel lip. I also checked a 285 MP4S tire mounted on a completely different 10" wide wheel (the MP4S tire bulges more due to a less rigid sidewall), and it protruded ~3.3mm past the wheel the edge.

You have what looks to me to be ~5mm clearance, so either of those tires wouldnt' bulge too far past the rim to rub in a problematic way.

Note:
The section width of the 305/30 RE71R on an 11" wheel is 12.3", and only protruded 2mm past the wheel lip
The section width of the 285/35 MP4S on a 10" wheel is 11.4", and protruded ~3mm past the wheel lip

So, given that, I think you're good with a 275 tire or even a 285 tire, as long as it's not too bulgy. The section width specs will tell you that. If your chosen tire has a section width of 11.4" or less on a 10" wheel, I think you're good to go, but I'd try to keep the section width a tenth or two smaller than an 11.4 if you can.

Note: the next smaller MP4S tire that Michelin makes below their 285 is a 275/40, and if you look that up on TireRack you'll see that it has a section width of 10.9"... which should easily work for you... except it was measured on a 9.5" wheel, and will likely be nearly a whole 1/2" wider when mounted on a 10" wheel... pretty close in section width to their 285/35, maybe a tenth or so less when all is said and done. Pay attention to the wheel width that the section width was measured on, it matters.

The Continental ExtremeContact Sport (another good max performance tire) has a section width of 11.4" on an 10" wide wheel, nearly exactly the same as the MP4S in the same size. The Conti ECS in 275/40 has a section width of 11.1" on a 9.5" wheel and honestly I'd be more worried about that fitting than either of the above 285 tires, and its probably due to the taller sidewall bulging a little more.

 

[AnthonyL]

Yes, this is going to work ... as long as you don't pick a tire that's too wide in the section width. So, the _inside_ of your 19x10" wheel from lip to lip is ~10" wide, and the outside edge of that lip that's closest to the strut is a little wider, and looks it like you have about ~5mm of clearance to the strut. As long as the section width of your chosen tire is not any bigger than ~11.4" you should be good. (make sure the section width was spec'd on a 10" wide wheel, Tire Rack's tire specs will tell you the wheel width the section width was measured on).

A 285 tire is approximately 'square' to a 10" wide wheel (it depends on the specific tire, since tire width specs vary a bit from manufacturer and tire to tire). The critical tire spec dimension for you now is called Section Width, and it is relative to the wheel width, but the tire specs (on TireRack.com) should tell you how wide the section width of any given tire is when its mounted on the most appropriate sized wheel.

Now for some real actual data: I measured an 11" RE71R with a 305 tire (which is a pretty square width match to the wheel) and that tire, which has a very stiff and flat sidewall only protruded <2mm past the wheel lip. I also checked a 285 MP4S tire mounted on a completely different 10" wide wheel (the MP4S tire bulges more due to a less rigid sidewall), and it protruded ~3.3mm past the wheel the edge.

You have what looks to me to be ~5mm clearance, so either of those tires wouldnt' bulge too far past the rim to rub in a problematic way.

Note:
The section width of the 305/30 RE71R on an 11" wheel is 12.3", and only protruded 2mm past the wheel lip
The section width of the 285/35 MP4S on a 10" wheel is 11.4", and protruded ~3mm past the wheel lip

So, given that, I think you're good with a 275 tire or even a 285 tire, as long as it's not too bulgy. The section width specs will tell you that. If your chosen tire has a section width of 11.4" or less on a 10" wheel, I think you're good to go, but I'd try to keep the section width a tenth or two smaller than an 11.4 if you can.

Note: the next smaller MP4S tire that Michelin makes below their 285 is a 275/40, and if you look that up on TireRack you'll see that it has a section width of 10.9"... which should easily work for you... except it was measured on a 9.5" wheel, and will likely be nearly a whole 1/2" wider when mounted on a 10" wheel... pretty close in section width to their 285/35, maybe a tenth or so less when all is said and done. Pay attention to the wheel width that the section width was measured on, it matters.

The Continental ExtremeContact Sport (another good max performance tire) has a section width of 11.4" on an 10" wide wheel, nearly exactly the same as the MP4S in the same size. The Conti ECS in 275/40 has a section width of 11.1" on a 9.5" wheel and honestly I'd be more worried about that fitting than either of the above 285 tires, and its probably due to the taller sidewall bulging a little more.

You guys have been giving some great info. Thank you. Hopefully this helps someone in the future as well.

I’m still up in the air on if I’m going to move forward or send them back. I would like to use them just because I think they look decent, cheap, and to say I did it lol. I was considering using the Firestone Indy 500s as I’ve liked them in the past. Their 275/40 was measured on a 9.5 rim and the section width was 10.9. Am I under this correct that on a wider rim the section width would be less correct? "Edit" Nevermind I read that backwards looks like it could be wider I guess. It seems like the same tire on the wider rim would have less sidewall I thought.

I’m going to mess with the wheel on the car tonight turning it to see how it looks and putting some weight on the shock to see how it looks there too before I decide to do anything. Thanks again for all the help to everyone.

 

[Fly2High]

NightmareMoon,
what I read from what you wrote is that there will be some tires that will not fit that rim with that spacer. You cannot just fit every 275/40 or 285/40 tire with that wheel and will need to be careful when you purchase tires.

A bigger spacer will allow you more choices. Longer studs will allow you more spacer choices which will allow you more tire choices.

 

[NightmareMoon]

NightmareMoon,
what I read from what you wrote is that there will be some tires that will not fit that rim with that spacer. You cannot just fit every 275/40 or 285/40 tire with that wheel and will need to be careful when you purchase tires.

A bigger spacer will allow you more choices. Longer studs will allow you more spacer choices which will allow you more tire choices.

for sure this isn’t ideal. Sounds like the OP would just get a different wheel instead of dealing with thicker spacers and studs.

 

[AnthonyL]

Ok update. I got the wheels and tires mounts up and everything seems to be just fine. I did the Indy 500 275/40s with a 5mm spacer for the wheels and no issues. Thank you for all your help! View attachment 431885

 

[MidwayJ]

Ok update. I got the wheels and tires mounts up and everything seems to be just fine. I did the Indy 500 275/40s with a 5mm spacer for the wheels and no issues. Thank you for all your help! View attachment 431885

Looks good! What size tires did you go with on the rear?

 

[AnthonyL]

Looks good! What size tires did you go with on the rear?

Thank you. 19x11 +56 with 325/30

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