Custom Offset - 9 in wheel on an '11 STi - Subaru WRX Forum
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post #1 of 7 Old 03-15-2017, 08:59 AM Thread Starter
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Custom Offset - 9 in wheel on an '11 STi

What custom offset should I specify for a 18x9 or and 18x9.5 inch wheel, for my track set of Motegi Traklite wheels?

I'm running a 245/40/R18 Toyo R888R tire at first, but might go wider in the future.

Also not interested in rolling the fenders and am planning to run stock suspension - aside maybe for a rear anti-roll bar one day.
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Last edited by LW_Black4; 03-15-2017 at 09:31 AM. Reason: stock suspension
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post #2 of 7 Old 03-15-2017, 01:07 PM
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this will tell you: https://www.wheel-size.com/calc/?whe...=30mm&scl=51mm

input your OE spec on the left and then you can adjust the right to see what will fit. i could help you choose if you post what the OE Specs are for your 2011 STI. fender clearance, wheelwell clearance, and suspension clearance being important to get right.

on a side note, how do you like those tires?
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post #3 of 7 Old 03-16-2017, 08:32 AM Thread Starter
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Thanks @titter , that's a useful link.

I've never run R-comps, so this will be my first experience with them. Need to get them on track-worthy wheels, so this post is part of my research.

"Evolving from the Proxes R888, the Proxes R888R is Toyo's Racetrack & Autocross Only tire for driving enthusiasts participating in track days, road racing and high performance driver education events. Like all Racetrack & Autocross Only tires, Proxes R888R radials are not intended to be driven in near-freezing temperatures, through snow or on ice. It's also essential these tires be stored indoors at temperatures maintained above 15 degrees F.

Toyo Tires recommends the following general set-up guidelines for the Proxes R888R:

Operating Temperature: 160°-220° F
Hot Inflation Pressures: 32 to 38 PSI
Camber: -1° to -3°
Caster: As much positive as possible" [Tirerack.com]
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post #4 of 7 Old 03-17-2017, 05:41 AM
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yea been reading about them and they look decent. let us know how they perform on the track.

last R tires i had lasted 18,000km so i never bothered again for R tires on my daily driver.they were dunlops and back in like 2004 lol. the softer compound makes for one hell of a sticky tire but they wear so friken fast its crazy.

the Eagle GT's i have, have a treadwear rating of 560 and a 80,000km warranty and hold the tarmac pretty good.

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post #5 of 7 Old 03-17-2017, 10:26 AM Thread Starter
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@titter

I'm happy that I'm finally going to be able to have a track set of wheels, to get around that wear issue you mentioned and avoid the compromises. It'll be the first time for this as well.

In due course I'll end up with 3 sets; winter, street and track.

So for a 9 in wheel, sounds like the correct offset is 48 or 49 mm.

I'll swap wheels and brake pads for the track, and switch back to the street set afterwards. Will need to run a bit of camber too for the R888Rs.

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post #6 of 7 Old 03-18-2017, 07:04 AM
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sweet dude! keep us posted

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post #7 of 7 Old 03-20-2017, 06:45 AM
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I'd say for 245 wide the correct offset is +55 (stock offset for the stock width). If you intend to run a wider tire, you might back off a little to +50 or +48 or somesuch but even then going to 265 will require fender modification. Any increase in tire is a nice advantage on the track but it has to be balanced against the corresponding issues with decreasing offset. Also many classes in autocross and other things have tire restrictions so keep that in mind.

I strongly suspect the answer you're looking for is +55.

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