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[bringsmewomen]

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[Matt_UKTX]

I believe all of the above statements are true, except for maybe the last one. I know some folks have 245/275 setups - but I'd prefer to play it safe, just in case...

[HRC]

Originally Posted by bringsmewomen

Ok. Just spoke to tire rack. They said:
They also mention that

• the Kumho SPT's are better than the General Exclaims.

• the stock BMW center caps will fit the aftermarket ASA AR1 rims.

• 235/35-19 fronts, 265/30YR19 rears are the biggest size I can get without any rubbing

Can someone please confirm on all points?

#1 - Probally, wouldn't surprise me
#2 - Yes
#3 - Nope, you can go bigger without rubbing, plenty of people run 245's in front and 275's in the rear. 235 and 265 are the most accurate sizes compared to stock, so I recommend them.


Danny

[bringsmewomen]

Originally Posted by HRC

#1 - Probally, wouldn't surprise me
#2 - Yes
#3 - Nope, you can go bigger without rubbing, plenty of people run 245's in front and 275's in the rear. 235 and 265 are the most accurate sizes compared to stock, so I recommend them.


Danny

So even with no rubbing you dont think I should do 245s and 275s eh? Why???

And do they look a lot different compared to 235, 265s?

[HRC]

Originally Posted by bringsmewomen

So even with no rubbing you dont think I should do 245s and 275s eh? Why???

And do they look a lot different compared to 235, 265s?

Dude, read my reply, it says in part..."235 and 265 are the most accurate sizes compared to stock, so I recommend them."

Danny

[HRC]

Originally Posted by bringsmewomen

...And do they look a lot different compared to 235, 265s?

They look...bigger.

Danny

[bringsmewomen]

Originally Posted by HRC

They look...bigger.

Danny

by how much? Sorry for the stupid question. I don't know what the 245's really signify.

[tl_boy]

you can view my post for some pictures between 235 and 275, may help.

[bringsmewomen]

Originally Posted by tl_boy

you can view my post for some pictures between 235 and 275, may help.

Yes, but the question is whats the size difference between 235 and 245, as well as the difference between 265 and 275... one inch?
BTW, you owe us pictures of them on your car!

[Snowman811]

Originally Posted by bringsmewomen

Yes, but the question is whats the size difference between 235 and 245, as well as the difference between 265 and 275... one inch?
BTW, you owe us pictures of them on your car!

You should use the calculator at the top of the page. This will answer your question of how big is the difference. I'm resisting the urge to answer your question of "How much bigger is 245 than 235?", with "10!"

FYI - the calculator gives you Diameter differences. Remember high school geometry taught you that Circumference = Diameter x 3.14.

[Matt_UKTX]

Originally Posted by bringsmewomen

by how much? Sorry for the stupid question. I don't know what the 245's really signify.

OK, here's my basic understanding. in tire sizes, the numbers are in the format XXX/YY/RZZ

The first XXX number, in this case 235 or 245 is the width of the tire in milimeters. There are approximately 24mm to one inch (I think).

The second YY number, in this case 35 or maybe 40, is the profile of the tire. It is expressed as a percentage. In other words 235/35, means that the sidewall is 235mm x 35% = 82.25mm. 245/35 would be 85.75mm, so a difference of 3.5mm.

The final RZZ number is the size of the wheel/rim in inches that the tire fits, eg. R18, R19, etc.

So to summarize, the difference between 235 and 245 is as follows:
- The 245 is 10mm wider
- The 245 is 3.5mm taller

The result of this is that with a 245 you will have marginally better handling, but your speedometer/odometer will be off by at least 2mph, maybe 3mph. You also increase weight and rolling resistance, which decreases fuel economy. The tires also look different. I personally prefer the slightly leaner look of the 235 and 265. I think that fatter tires look better on muscle cars, like mustangs, camaros, etc. My advice, stick with 235 and 265.

Good luck...

[bringsmewomen]

Thanks guys for the good explanations. I understand now.


Deciding what rims and tires is a big and complicated process!

[Snowman811]

Originally Posted by Matt_330i

OK, here's my basic understanding. in tire sizes, the numbers are in the format XXX/YY/RZZ

The first XXX number, in this case 235 or 245 is the width of the tire in milimeters. There are approximately 24mm to one inch (I think).

The second YY number, in this case 35 or maybe 40, is the profile of the tire. It is expressed as a percentage. In other words 235/35, means that the sidewall is 235mm x 35% = 82.25mm. 245/35 would be 85.75mm, so a difference of 3.5mm.

The final RZZ number is the size of the wheel/rim in inches that the tire fits, eg. R18, R19, etc.

So to summarize, the difference between 235 and 245 is as follows:
- The 245 is 10mm wider
- The 245 is 3.5mm taller

The result of this is that with a 245 you will have marginally better handling, but your speedometer/odometer will be off by at least 2mph, maybe 3mph. You also increase weight and rolling resistance, which decreases fuel economy. The tires also look different. I personally prefer the slightly leaner look of the 235 and 265. I think that fatter tires look better on muscle cars, like mustangs, camaros, etc. My advice, stick with 235 and 265.

Good luck...

Funny. That's exactly what the calculator does for you automatically. You already know this, right?