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FL5 with stock height 265/35/18 vs 255/40/18

getbo

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I was wondering which would be better tire for 18" running with stock height

and what are the pros and cons of getting 265/35/18 or 255/40/18

TIA
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Icehawk

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Use this to see size differences:
https://www.miata.net/garage/tirecalc.html

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
265/35-18 3.7in 12.7in 25.3in 79.5in 797 0.2%
255/40-18 4.0in 13.0in 26.0in 81.8in 775 3.1%

Personally I like to keep it to within ~3% difference for road use so either size would be fine, I'd opt for the 265s though unless there is a tire you really prefer in 255/40. The 255 *may* ride a little better and have slower turn-in BUT that is really tire dependent IME.

Running the taller tire will help close the wheelwell gap, on my ND Miata I ran a taller/wider tire and that was a positive to me. 3% taller gearing wasn't something I ever noticed.

HTH
 

Icehawk

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Here this might help, a partial list:

265/35-18 3.7in 12.7in 25.3in 79.5in 797 0.2%
275/35-18 3.8in 12.8in 25.6in 80.4in 788 1.3%

285/30-18 3.4in 12.4in 24.7in 77.7in 815 -2.1%
285/35-18 3.9in 12.9in 25.9in 81.2in 780 2.4%
 


Icehawk

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Diameter doesn't matter for offset, stock is +60. Seems like ~+40 is common when moving to a 10" wide wheel.
 

CTRifecta

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I'm personally going to run 265/40/18 on my DD setup. It's about 4% bigger overall diameter (+1 inch) but 36% increased sidewall (+1 inch) vs stock 265/30/19, without any decrease in width.

I'll post some pics once my setup is installed, gotta take delivery of my civic first

Edit- ended up going with 265/35/18s
 
Last edited:
OP
OP

getbo

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I'm personally going to run 265/40/18 on my DD setup. It's about 4% bigger overall diameter (+1 inch) but 36% increased sidewall (+1 inch) vs stock 265/30/19, without any decrease in width.

I'll post some pics once my setup is installed, gotta take delivery of my civic first
whens your ETA and which state is your dealer? Im also waiting for mine from Ohio dealer
 

CTRifecta

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My car apparently should be arriving to the dealer today. KY dealer
 


Kfo_cpa

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My car apparently should be arriving to the dealer today. KY dealer
Good to hear. Keep us updated on the wheel setup. I’m interested in doing a similar setup. Do you know what rims you’re going with?
 

Robert.C

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Here this might help, a partial list:

265/35-18 3.7in 12.7in 25.3in 79.5in 797 0.2%
275/35-18 3.8in 12.8in 25.6in 80.4in 788 1.3%

285/30-18 3.4in 12.4in 24.7in 77.7in 815 -2.1%
285/35-18 3.9in 12.9in 25.9in 81.2in 780 2.4%
Another option if people want to go narrow (not as crazy as it sounds; tires are cheaper and you can somewhat compensate for the reduction in tread width by moving to a stickier compound).

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
265/30-19 3.1in 12.6in 25.3in 79.4in 798 0.0%
245/40-18* 3.9in 12.9in 25.7in 80.8in 784 1.8%

*FK8 OEM tire width
 

HONDANB

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I run a 265/40/18 on a 18/9.5 +45 wheel. Very meaty tire, but can deal with potholes, tall speed bumps and steep drive way easily now
B5D3DDF4-9C6A-4D44-A562-5251C0EC4B34.jpeg
Do you have more pics of your whole car? Just to have more perspective of the setup.
 
 




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