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Old 01-07-2006, 02:22 PM   #1
bigworm
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2005 pp psm wrx with
mix of v6,7,8 sti parts

Default want to run a little more diameter 245-40-18

now this is just for the street im getting 18s soon and what to know if a 245-40-18 will work diameter wise ... when you turn the wheel would any part of the tire hit the car? im not worried about rubbing as my fenders wil be rolled soon most likely these will be going on 18x8 torques i just want t alitle more diameter so i will have less fender gap and my rpms might drop a little on the freeway... with my 4.44 tranny they are kinda high.

any help would be appreciated
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Old 01-08-2006, 11:55 AM   #2
bigworm
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no one knows?
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Old 01-08-2006, 06:33 PM   #3
UltimateLurker
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Your stock rolling diameter is 25.1", which you'll be increasing (a general no no), depending on the specific tire you run you could be looking at a .7" increase, or more. Here are a few tire diameters in the size you mentioned...

S02: 25.7
S03: 25.6
F1 GS-D3: 25.7
Pilot Sport: 25.8
PZero Rosso: 25.7

You'll find that the 235/40 is a much more popular choice...

S02: 25.3
S03: 25.4
F1 GS-D3: 25.4
Pilot Sport: 25.4
PZero Rosso: 25.2 <---my personal favorite.

As far as the rub, my guess is that no one wants to speak for such because it's usually not an issue. Also, providing the offset as well as the size may help next time .
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Old 01-08-2006, 07:46 PM   #4
bigworm
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why is increasing tire size a general no-no? they will be on 17x8 with a 48 offset
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Old 01-08-2006, 09:59 PM   #5
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Because it decreases the torque to the wheels. My recommendation is still the 235/40, but +48 is pretty good, so I believe you could get away with the 245/40.
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Old 01-08-2006, 10:04 PM   #6
bigworm
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i had 245 40 17 before on the same offset i just want a little more diameter so that my rpms will be lower on the freeway im at 3500 at 65 and 4100 at 75 i know my speedo wont be right but i switched to a jdm sti cluster recently anyway so i already dont know how fast im going... also i want less fender gap with the same drop.
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Old 01-09-2006, 11:08 AM   #7
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Quote:
Originally Posted by bigworm
i had 245 40 17 before on the same offset i just want a little more diameter so that my rpms will be lower on the freeway im at 3500 at 65 and 4100 at 75 i know my speedo wont be right but i switched to a jdm sti cluster recently anyway so i already dont know how fast im going... also i want less fender gap with the same drop.

....and kill acceleration.

can't have both....pick one.
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Old 01-09-2006, 11:43 AM   #8
bigworm
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i have a 4.44 dccd sti ra v limited, acceleration isnt a problem.
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Old 01-10-2006, 02:09 AM   #9
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Quote:
Originally Posted by bigworm
i have a 4.44 dccd sti ra v limited, acceleration isnt a problem.


...well the extra weight isn't pretty
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Old 01-10-2006, 12:05 PM   #10
khail19
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Quote:
Originally Posted by bigworm
now this is just for the street im getting 18s soon and what to know if a 245-40-18 will work diameter wise
Quote:
Originally Posted by bigworm
why is increasing tire size a general no-no? they will be on 17x8 with a 48 offset
How will you get a 245/40/18 tire on a 17x8 rim? Duct tape?
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Old 01-10-2006, 03:11 PM   #11
bigworm
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yea except its going on an 18x8 rim cause they make the torques in 18'' now... with a 48 offset. i used to have 17x8 torques with a48 offset and 245-40-17's
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