Volk CE28N - Subaru WRX Forum
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#1 Old 03-11-2008, 05:46 PM
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Volk CE28N

I have a set of Volk CE28N 18x8.5 with offset 44. Does anybody have any advice on what tire size to use for a 2004 WRX sedan?
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#2 Old 03-11-2008, 05:54 PM
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here u go.

The stock offset is 53 mm. This means your rim is mounted to the hub about two inches further out than center. The suspension expects the center of the rim to be there accordingly. Changing the offset more than a few mm is unwise. You can seriously hinder the stock suspension's capabilities. Try to stay within 5 mm of stock so, basically, no less than 48 mm. Is 47 so bad? No, but <40 sure is. It's a gradual thing. 5mm is just a rule of thumb. Balance the decrease in performance due to offset issues against what you'll be gaining in tire though.

got it from here

Wheel / Tire FAQ

I dont think those wheels will work...they might...

12.7 @ 109
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#3 Old 03-11-2008, 06:09 PM
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those rims are good if you want to run some wider tires. 44mm means you're 9mm further out than stock which means you can get 18mm wider than stock rubber and the inside tire would be right where it would be stock. STi's run 225 wide +53 offset without rubbing so you're probably looking at like 245 wide at that point mattering on the height (245x35x18 or something, too lazy to do the math). Wider tires are great! 8.5" rim would sure fit them

The catch, and it's a big one, is that you've now moved the geometry of the suspension out 9mm from stock. That's a lot. You now have nice fat meats that fit but your suspension just took a nose dive. Will they fit on your car? Yes. Will they allow for fatter tires? Yes. Will your handling improve? well... I'd have to say it would be worse than a good set of 225s with stock offset. YMMV

Oh, and another little thing I didn't put in that faq is if you went with 44 offset 245 wide tires, you're now sticking out 19 mm more than stock STi (let alone WRX). That's almost an inch. When they stick out too much, you can get pulled over for it. It's a safety issue to have a tire sticking out past the wheel well.

WRX Wide body kits increase the fender coverage and also change the suspension geometry to accommodate far less offset and thus more tire width. There's only so much you can do without addressing those two issues.

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#4 Old 03-11-2008, 07:28 PM
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8.5" rim is a full 2" wider than your oe rim- w/ that width you don't want oe like offset as you'd run out of room inboard, I'd say at 8.5" 44 et is just about "perfect"

I'd look at a 245/35/18- that's a very suitable tire for that rim width and should still fit w/o too much drama on a WRX (possibly some rolling of the fender in the rear).

I had a set of CE28N's- one of the best rims made- strong AND light- nice looking too

Mike

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#5 Old 03-11-2008, 09:06 PM
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it's the right offset for that width and 245/35/18 is the right height/width for that rim, the question is do you want 44 offset? I wouldn't

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#6 Old 03-11-2008, 09:26 PM
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well it depends- if I was racing in class that allowed 8.5" rims I for one would certainly exploit the rule

I ran 46 et Volk rims for several years w/ no ill effects, one year I ran them w/ a 5mm spacer up front so effectively a 41 et (albeit this was just for events)

if your going to run a wide wheel/tire combo your going to have to decrease the offset- no getting around it- certainly not advocating crazy low offsets, but for a 8.5" wheel 44 is pretty damn close to ideal

if your running a narrower wheel/tire then a higher offset would be more desirable

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#7 Old 03-11-2008, 10:56 PM
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you're saying it's ideal though because its' as much offset as he can get away with running 245s on 8.5"ers and I agree but the question is really would you rather have 20mm more tire or 10mm closer to stock offset? I'd love to hear some real track experience on tire width vs offset. On the street, it's rare you get to objectively compare the two directly.

Something like this:
225s at +53
235s at +48
245s at +43
255s at +38
265s at +33
275s at +28
all sitting on a rack brand new of the same type and all magically at the same 25" height with proportionally reasonable weights and no restrictions other than keeping your stock suspension. Which do you chose for a track day?

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#8 Old 03-16-2008, 11:44 AM
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that's the general idea- as you go wider w/ rims/tires it becomes very difficult to maintain the oe offset (your gaining inboard width that can only go so far)

you still want to try though, running a very low offset plays havoc w/ the wheel bearings (which are already stressed running a track day)

my list would look a little different

7-8" rim (225-245) 46-52 et
8.5-9.5" rim (255-305) 38-44 et

these are ballpark estimates- not dyed in the wool rules , if you have two rims and they are close to identical in every other way (width, weight, strength)- I'd choose the one w/ the higher offset (if it fits of course!).

going to wide rums/tires requires careful planning- offset plays an important role in that decision, but so does camber, ride height, spring rates and the ability to roll (or in extreme cases- cut) the fenders

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#9 Old 03-16-2008, 03:39 PM
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Which do you chose for a track day?

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#10 Old 03-16-2008, 09:21 PM
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out of your list? probably the 245 or 255's (wheel bearings aren't fun )

personally I run 17x8 et 46, 235/40/17- I'd run even wider but my autox class restricts rim width to 8"- the wheels do double duty

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#11 Old 03-17-2008, 08:58 PM
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What about 235/40/18? I read somewhere that someone used that size with no problems. Might look funny though.
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#12 Old 03-17-2008, 09:21 PM
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235/40/18 is fine- little taller than stock, but not bad

Mike

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#13 Old 03-17-2008, 11:40 PM
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235 is a hard size to fit on 17s and 18s. It is always going to be too big or too small. Generally, you want too small so I'd go 235/35/18. Course, why are you on 18s anyway if you want that wide?

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#14 Old 03-18-2008, 11:10 AM
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Well the only reason I have 18s is because they were offered to me at very low price. I actually would rather have had 17s but I could'nt turn down the offer. Basically what I want is a tire that will allow me to drop to a nice ride height without worrying about rubbing.
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#15 Old 03-18-2008, 12:24 PM
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08' sti's and 08' evo's are now 18's from factory

rollin on 17's now and they're dirty
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