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255/35/18 Vs 245/40/18's For The 1/4?

R33GOD

By R33GOD,
in Motorsport Discussion & Builds

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R33GOD Grand Master

R33GOD

Posted
Posted

hey again

wanna run my car down the 1/4 as i have previously stated but i want to be realistic and run with my street tyres.. i got 18 in rims on it now and wanna know what tyre to go for... either a 255/35/18 or 245/40/18?

a friend told me to go for the 245's cause of its higher profile.

i have no clue..

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siddr20 Grand Master

siddr20

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Posted

You will probably get a faster time with smaller inch rims..

Im no expert either..

but i remember when i was at the drags, a guy from this forums put his stockies on and got a much better time than his 18 inch rims lol...

Anyways i dont think you will find some difference between them.. It will come down to your launch, and how well the rubbers grip..

Do the 255s, have better rubber than 245s??

R33GOD Grand Master

R33GOD

Posted
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Posted
You will probably get a faster time with smaller inch rims..

Im no expert either..

but i remember when i was at the drags, a guy from this forums put his stockies on and got a much better time than his 18 inch rims lol...

Anyways i dont think you will find some difference between them.. It will come down to your launch, and how well the rubbers grip..

Do the 255s, have better rubber than 245s??

im not too sure but a friend who works with tyres told me that the 40 profile is better for the strip

Green_s13 Proficient

Green_s13

Posted
Posted

the larger profile will give you more grip as the side wall will have a bit more flex so in s triaght line you the tire wont spin up as easily, i would also lower your tire pressure to give you a geater contact area with the road

have fun at the drags

FATGTS-R Experienced

FATGTS-R

Posted
Posted

I'd say there would not be much in it running the 18s.

The 255 gives you up to 10mm more width. I say up to as a tyres width rating is a maximum width allowed meaning it could in fact be smaller. Wheels or Motor mag did a tyre comparo a while ago with a variety of 245 wide 17s and only one make of tyre (the cheapest) actually measured up to 245 wide, the rest were all narower.

The 245 tyre will give you around 9mm more sidewall which is ideal for drag but make your overall diameter 18mm taller.

I guess if one had to be chosen it would be the 245 but thats assuming both tyres are the same make etc.

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