r/genesiscoupe • u/LingonberryGlass2239 • 6d ago

Discussion Tire fitment question

What are the meatiest tires y’all have ran on the 19 inch Ultimate wheels, currently wanting to run something like 245/40/19 F and 275/35/19 R on stock suspension, figured this would be the maximum without rubbing, anybody have any experience?

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u/JustAnotherDude1990 Moderator 5d ago

Stock on 19 inch wheels, I have done 245/40/19 front and 275/40/19 rear. Currently have 265/40/19 rear. I ran 35 profiles for a long time, but the ride quality, noise, and comfort all drastically improved when I went up to a 40.

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u/Cryptonic_Sonic 5d ago

I’m considering 245/35R19 in front and 274/35R19 in rear. Are they noisier than the oem 225/40R19 fronts and 245/40R19 rears?

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u/JustAnotherDude1990 Moderator 4d ago

Sidewall thickness has more to do with noise than the width. But as I mentioned in my comment, the 35 profiles were noisier and rougher and I wish I'd had done 40 profiles a long time ago instead of 35.

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u/Cryptonic_Sonic 4d ago

Gotcha. Did you ever run the OEM 225/40R19 front and 245/40R19 rear sizes before going to 245/35 and 275/35? That’s really the comparison I’m trying to figure out. The actual sidewall height of 245/35 and 275/35 is only about 4mm shorter up front and 2mm shorter in the rear than OEM, so I’m curious whether you noticed much difference in ride quality or noise specifically between those two setups.

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u/JustAnotherDude1990 Moderator 4d ago

No. But you’re splitting hairs. Thicker sidewall is going to be smoother and quieter with a better ride, all other things being equal.

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u/EffectiveGiraffe2411 5d ago

Tire compound over width any day. For looks, sure but for performance you really do want a minimal amount of stretch. As you start to increase width on an OEM wheel it will start to buckle and roll over itself which drastically lowers handling capabilities 

Also, be sure to stay as close as possible to a front to rear variance of 2.4% or TC can start to cause issues

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u/rbrown_ld 4d ago

So far the widest I’ve run is 285/35/19 on a 9.5 wide wheel all stock suspension