jspecvtec

iTrader: (4)

Wouldnt the wider 245/275 tires increase the scrub radius which contributes to less steering response than 235/265 or stock sizes assuming camber is the same?

Jz39

iTrader: (2)

That's my thought as well bc the diameter of the 245/35 is the same delta as the 235/40 (0.3", just in be opposite direction) while the 275/30 is 0.5" smaller than stock vs 0.3" larger for the 265/35, so the 275 is a bit worse in theory. And again, the 235/265 set up is exactly 0.3" larger than stock front and rear, keeping the revs/mile consistent front to back.

I'm kind of glad that the 235/265 is a bit larger in diameter than stock (although 0.3" is minimal), but this should not increase ride harshness compared to reducing diameter for the 245/275 set up.

Anyways, I think both are fine options, splitting hairs.

jspecvtec

iTrader: (4)

Yeah I daily mine so I don't want the extra harshness going with 35/30 especially when I gotta go through ****ty roads sometime. I've seen some members go with 245/40 and 275/35. It's all less than 3% from stock OD. No biggie besides a few mph off actual

lobuxracer

iTrader: (2)

No because they are much closer to stock in diameter. Width has nothing to do with scrub radius.

jspecvtec

iTrader: (4)

If tire width has nothing to do with scrub radius, then why is it mentioned that the 235/265 combo is bad cuz the scrub radius is changed? Also, I'm still not sure what you mean when you say it's "much closer to stock diameter"? One is taller (235/265) than stock OD and the other (245/275) is shorter by the same amount

Jz39

iTrader: (2)

Actually. the 235/265 combo is closer to stock: 235 and 265 are each 0.3" increase over stock whereas 245 is 0.3" smaller and 275 is 0.5" smaller.

SubOrbital

The tires start life at 10/32, so it's a 10% reduction in both...as it should be.

I prefer a slightly shorter tire versus a slightly taller tire. Gearing advantage.

Caliman

iTrader: (1)

LowBuxracer...

Running a 2012 factory BBS rim, how can such minimal change in overall height .3",
while staying within factory specs as far as ratio of front to rear,
have a noticeable detrimental effect on handling? <<<

we're looking at exactly 8 MM jump in both sizes
8MM is almost within variances of different tire brands and models of the same size if I recall

the OEM tires on the 2015 Lexus RC are these 235/265 sizes...

What exactly are the drawbacks to such a small change in height and width?

With people saying 245/275 which is a much greater change in and difference between front and rear as well, so those sizes, using the statements you made as a guide, should be even worse than the 235/265 =)

And, have you ever actually ran or driven ISF w/ 235/265 yourself?

ISF4life

iTrader: (30)

class is now in session lolz, Lob is going to open a very big can of whooo azzz lolz . Here we go again lolz

3nergiz3d

I was in the same position until I got schooled with knowledge from LobuxRacer.

Proposed:

235/35/19 diameter 25.5" 817 revolutions per mile 91Y load rating
265/30/19 diameter 25.3" 822 revolutions per mile 93Y load rating

OEM:

225/40/19 diameter 26.1" 797 revolutions per mile 93Y load rating
255/35/19 diameter 26.0" 799 revolutions per mile 96Y load rating

What most of us are running:

245/35/19 diameter 25.8" 807 revolutions per mile 93Y load rating
275/30/19 diameter 25.6" 814 revolutions per mile 96Y load rating

What I am running:

255/35/19 diameter 26.0" 799 revolutions per mile 96Y load rating
275/30/19 diameter 25.6" 814 revolutions per mile 96Y load rating

What would be ideal:

295/30/19 on all four corners.

cwajciec

Hey has anyone road course tracked their car with 255/35/19 all the way around? I've tracked my 11 ISF with stock sizes and I can tell I need more rubber up front. Michelin PSS tires. I'm curious if I go from 225 to 255 on the stock rim if it will actually hurt my front end grip?

Bigjon3475

iTrader: (2)

Minimum width wheel is 8.5" wide for 255's. That's assuming you're talking about 2011 stock wheels.