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TRNSFST
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Discussion Starter · #1 ·
My dilema: I don't want to wait for the 285/30 and 315/30 pirelli pzeros, and I can't afford the wear of Pilot sports, so....

I'm going with Kumho MX in 265/35 or 275/35/18 up front. Will put 295/35/18 on my rear 18x11. Which front size should I go with? I'm leaning towards the 265, simply because the 275 is rated at 25.7 inches tall!! Maybe too much. Either way, the front fenders are getting rolled, and the rears are getting flares.

Decided on the Kumho MX because they are cheap, fairly wide for their rating, and in stock:eek:
 

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How wide is your front rim?
 

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275 is a pretty wide front tire. youll most likely rub from what ive heard, lots of people use 275's as their rears. if it works, awesome, i want 285 fronts but i think im getting do luck fenders with 10 inch fronts.
 
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I'm running 275/35/18 on a 10" rim up front,get a very slight rub on the bottom front of the arch liner on hard turns....

Daz
 

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daz - what is your offset, do your wheels come out past the fender? do you think they would with another 5mm of offset (to allow for 285's) ? are your fenders rolled?
 

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TRNSFST
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Discussion Starter · #6 ·
LYTLdiablo said:
275 is a pretty wide front tire. youll most likely rub from what ive heard, lots of people use 275's as their rears. if it works, awesome, i want 285 fronts but i think im getting do luck fenders with 10 inch fronts.
My fronts are 18x10, +47 offset, proven already...

so yea, I'm probably going with the 265/35 unless I find a decent price on some 285/30/18s. The 275/35/18 has worked before on a stock front fender, but it just seems too tall from stock: 25.7" vs. 25.3" stock.

Also, as noted, my car is getting the front fenders rolled, and other rubbing issues worked out (probably not that hard).
 

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TRNSFST
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Discussion Starter · #7 ·
Daz said:
I'm running 275/35/18 on a 10" rim up front,get a very slight rub on the bottom front of the arch liner on hard turns....

Daz
Daz, sounds nice. Have you tried to bang out the rubbing issues in the fender liner? You have +47 offset too?

Does the tire look really tall? I want to go up to the 275 Kumho MX, and they don't make 285/30
 

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4G63 said:
My fronts are 18x10, +47 offset, proven already...

so yea, I'm probably going with the 265/35 unless I find a decent price on some 285/30/18s. The 275/35/18 has worked before on a stock front fender, but it just seems too tall from stock: 25.7" vs. 25.3" stock.

Also, as noted, my car is getting the front fenders rolled, and other rubbing issues worked out (probably not that hard).
so you already have 275/35s on there, but you think they look too tall?

well i did the calculations for you, and although you may think they look too tall, they are actually the perfect size

235/45/17 - 25.33 inch diameter and 6.63 foot circumference
275/35/18 - 25.58 inch diameter and 6.69 foot circumference

that .06 feet per rev only comes out to 1.99mph of difference on your speedometer...at 200mph. so actually 275/35 is the correct size speedometer wise.
 

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TRNSFST
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Discussion Starter · #9 ·
LYTLdiablo said:
so you already have 275/35s on there, but you think they look too tall?

well i did the calculations for you, and although you may think they look too tall, they are actually the perfect size

235/45/17 - 25.33 inch diameter and 6.63 foot circumference
275/35/18 - 25.58 inch diameter and 6.69 foot circumference

that .06 feet per rev only comes out to 1.99mph of difference on your speedometer...at 200mph. so actually 275/35 is the correct size speedometer wise.
no, I haven't fitted 275/35 on the front yet, just saying that it's been done already. I was asking Daz how his looked. For some reason, most of the tire companies rate the 275/35 at 25.7 after measuring it.

Anyhow, the 265/35 comes out to 25.30, which is dead on stock. 25.58 doesn't sound like too much more, but if the tire companies rate em at 25.7, maybe they are taller than the math...

Diablo, could you calculate my speedo with what I got right now? I have 275/40/17s on the rear, and the fronts are stock fitment. It seems like it's off a good bit..
 

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4G63 said:
no, I haven't fitted 275/35 on the front yet, just saying that it's been done already. I was asking Daz how his looked. For some reason, most of the tire companies rate the 275/35 at 25.7 after measuring it.

Anyhow, the 265/35 comes out to 25.30, which is dead on stock. 25.58 doesn't sound like too much more, but if the tire companies rate em at 25.7, maybe they are taller than the math...

Diablo, could you calculate my speedo with what I got right now? I have 275/40/17s on the rear, and the fronts are stock fitment. It seems like it's off a good bit..
well i guess i had a brain fart, i should have known to check the 265's. youre totally right they are even closer than the 275's, im just always in favor of more rubber on the ground. they are only off -.19 mph at 200mph, so if youre looking for accuracy, they are the way to go.

as for your speedo, against the stock 235/45/17's, your 275/40s are going to give you an increase of .7928mph at 60mph, and 1.321mph at 100mph, and 2.643mph at 200mph (you will be doing that much more than what your speedometer says) so it wont be that much of a difference, at least not enough to get you a ticket.

but as we have covered different companies say different things, i dont know if this is actually tire specific like they take the time to measure, or if its crude (and inaccurate) calculations. i suppose the differences may be found in varying tread depths.

let me know if you want any more. i made a calculator on my computer that does a lot of calcs...tires, gears, top speed per gear @ X redline, etc...
 
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4G63 said:
Daz, sounds nice. Have you tried to bang out the rubbing issues in the fender liner? You have +47 offset too?

Does the tire look really tall? I want to go up to the 275 Kumho MX, and they don't make 285/30

The rubbing on the plastic liner is hardly noticable,and only on hard turns..... The fenders are not rolled and I've just removed the arch liner to fender self tapping screws...

Click here for front tyre pic

The offset on the fronts is +37

Daz
 

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A 275/35R18 won't work with a +47mm offset. The 285/30 will work because it is short enough to not rub. The 275/35 is too tall and will rub the inner fender liner. If I were you I would go with the 265/35 until you can afford the 285/30's.

Later, Steve
 

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488ci V10 Power
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I have the 265/35 on 18X10's and no rubbing at all. I would stick with that.
 

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MK4LIFE said:
I have the 265/35 on 18X10's and no rubbing at all. I would stick with that.
first off...gorgeous car

secondly, what suspension do you have, im on tein FLEXs and ill probably be going to more of a racing coilover. what is your offset? do you think a larger offset with the do luck fenders would allow 285's?
 

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285/30's will fit on an 18x10" +47mm offset with stock fenders. Frank Ward is running that setup now.

Later, Steve
 

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sorry for being unclear, the reason i was bringing fenders into the equation was because i was thinking about 285/35, so the wheels would obviously have to be set out farther. the fenders would give me an extra inch to work with technically
 

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Steve Jarvis said:
285/30's will fit on an 18x10" +47mm offset with stock fenders. Frank Ward is running that setup now.

Later, Steve
I'm running +45mm with a 285/30/17 up front, no rubbing - no modifications to front fenders. I do have Tein HA Coilvers though.

-m
 

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TRNSFST
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Discussion Starter · #19 ·
Steve Jarvis said:
A 275/35R18 won't work with a +47mm offset. The 285/30 will work because it is short enough to not rub. The 275/35 is too tall and will rub the inner fender liner. If I were you I would go with the 265/35 until you can afford the 285/30's.

Later, Steve
Sounds like a plan.. I'll stick with the 265/35 until next year. Also, when the front fender is rolled, the guy told me paint would probably chip off. Is it possible to not chip paint? If it does chip, that makes my cost for the fender rolling jump up like no other.
 

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Marcus Frost said:
I'm running +45mm with a 285/30/17 up front, no rubbing - no modifications to front fenders. I do have Tein HA Coilvers though.

-m
you mean 285/30/18, right marcus?
 
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