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Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack Specific topics relating to wheels and tires.


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Old 09-26-2019, 11:34 PM   #4131
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Is it true that tire size 225/40/18 has a difference of 0.47 in. (1.9%) from stock diameter while the larger tire size 245/35/18 only has a difference of 0.13 in. (0.5%)? I was on this tire size calculator website and found that pretty interesting. I’ve decided on wheel choice finally just debating 17s or 18s. I’d like to stay as close to stock as possible for speedometer accuracy, overall height etc.
Yes, you are correct. A 245/35/18 is closer to OEM diameter than a 225/40/18. The general rule of thumb for tire sizing is plus or minus 3% different from stock is ok.

I'm running 245/35/18 square. It's a sweet spot for width, weight, and diameter.
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Old 09-26-2019, 11:47 PM   #4132
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Yes, you are correct. A 245/35/18 is closer to OEM diameter than a 225/40/18. The general rule of thumb for tire sizing is plus or minus 3% different from stock is ok.

I'm running 245/35/18 square. It's a sweet spot for width, weight, and diameter.
Thanks! Thatís good to know. Whatís the width of your wheels? Springs should be coming in soon so I think 8.5 is about where I want to be.
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Old 09-26-2019, 11:55 PM   #4133
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Thanks! That’s good to know. What’s the width of your wheels? Springs should be coming in soon so I think 8.5 is about where I want to be.
18x9 +42 with spacers making them +30 front +27 rear. They fit with springs. -2 rear natural camber and -1.4 front from just a set of camber bolts. I'm on coils now though.

18x8.5 is a good size, what's the offset?

If I had things to do over again I think I would get bilsteins for the Eibach springs, LCA, camber bolts, and a bumpsteer kit. I feel this would have been a great street setup.
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Old 09-27-2019, 12:08 AM   #4134
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18x9 +42 with spacers making them +30 front +27 rear. They fit with springs. -2 rear natural camber and -1.4 front from just a set of camber bolts. I'm on coils now though.

18x8.5 is a good size, what's the offset?

If I had things to do over again I think I would get bilsteins for the Eibach springs, LCA, camber bolts, and a bumpsteer kit. I feel this would have been a great street setup.
I think they were +44, if I remember correctly. That might be what Iíll do and just piece everything together one by one. Not looking for a super aggressive setup or a track setup. Just a good looking, functional, daily driver.
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Old 09-27-2019, 12:35 AM   #4135
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I think they were +44, if I remember correctly. That might be what Iíll do and just piece everything together one by one. Not looking for a super aggressive setup or a track setup. Just a good looking, functional, daily driver.
Those are a good size. 18x8.5 +44 is functional and conservative. 245/35 will sit squarely on a 18x8.5 for a meatier look. 225/40 is also a good size, they would give you a slight stretch, there are more tires to choose from, and they are cheaper.

Your wheels will be sunk in 20mm in the front and 23mm in the rear compared to my wheels.

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Old 09-27-2019, 01:00 AM   #4136
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Those are a good size. 18x8.5 +44 is functional and conservative. 245/35 will sit squarely on a 18x8.5 for a meatier look. 225/40 is also a good size, they would give you a slight stretch, there are more tires to choose from, and they are cheaper.

Your wheels will be sunk in 20mm in the front and 23mm in the rear compared to my wheels.

I really appreciate your help. I like the sound of the 245/35. Iíd rather the wheel be sunken in than to poke honestly. Wouldnít really bother me. Especially knowing itís so close to stock diameter. Thanks again
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Old 09-28-2019, 04:52 AM   #4137
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For 18" wheels, square set-up, what would be the maximum width and offset that the rear can take with coils at ~stock height? Might do very slight camber, up to ~-1.5 front ~1.0 rear.

I'm thinking of getting custom wheels made and a possibly +20mm aftermarket front fender, want to know my upper limits.

Last edited by Firedrops; 09-28-2019 at 09:18 AM.
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Old 10-03-2019, 11:42 AM   #4138
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For 18" wheels, square set-up, what would be the maximum width and offset that the rear can take with coils at ~stock height? Might do very slight camber, up to ~-1.5 front ~1.0 rear.

I'm thinking of getting custom wheels made and a possibly +20mm aftermarket front fender, want to know my upper limits.
Max rear width custom made wheels? Here are some for sale!

https://www.ft86club.com/forums/showthread.php?t=136926
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Old 10-12-2019, 08:01 AM   #4139
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Max rear width custom made wheels? Here are some for sale!

https://www.ft86club.com/forums/showthread.php?t=136926
18x10.5 +50, +3mm spacers... so the stock rear fits 18x10.5 +47mm? daaaaayum
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Old 10-23-2019, 03:06 PM   #4140
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That is why I'm using a very uncommon 4mm spacer, which i heard leaves enough turns/threads to be fine and that 5th mm is what puts it over the top to not have enough.
Just an update to an earlier post,
Installed 17x9 +45 255/40R17 in rears, i am using a 4mm hubcentric/wheel centric spacer with 100% stock suspension. Plenty of room between tire and strut/spring perch.

Tire is flush to outside of fender.

Also the 4mm spacer still allowed lug nut 8 1/4 turns once torqued to 90 ft lbs.
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Old 10-23-2019, 03:12 PM   #4141
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Just an update to an earlier post,
Installed 17x9 +45 255/40R17 in rears, i am using a 4mm hubcentric/wheel centric spacer with 100% stock suspension. Plenty of room between tire and strut/spring perch.

Tire is flush to outside of fender.

Also the 4mm spacer still allowed lug nut 8 1/4 turns once torqued to 90 ft lbs.
What brand and model 255/40 tire?
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Old 10-23-2019, 03:37 PM   #4142
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Just an update to an earlier post,
Installed 17x9 +45 255/40R17 in rears, i am using a 4mm hubcentric/wheel centric spacer with 100% stock suspension. Plenty of room between tire and strut/spring perch.

Tire is flush to outside of fender.

Also the 4mm spacer still allowed lug nut 8 1/4 turns once torqued to 90 ft lbs.
Do you have pictures of that setup? Are you planning to keep the suspension stock?
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Old 10-23-2019, 08:34 PM   #4143
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What brand and model 255/40 tire?
Rear is Michelin pilot sport a/s 3+ on advanti dst storm 17x9 +45 W/ 4mm spacer.
Front is Same but 225/45r17 on 17x8 +35 no spacer.
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Old 10-23-2019, 08:39 PM   #4144
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Do you have pictures of that setup? Are you planning to keep the suspension stock?
I bought rear LCA, front camber bolts, and had RCE yellow on back order but after 2 months got impatient, refunded springs and bought rear rims + 4 tires.
But now I'm thinking tein flex A coils sometime later, still got LCA and bolts.
Maybe once i get around to selling my old but still new tires i just took off and 2 rims ill buy them.

Ill get some pics later.
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