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Old 10-12-2000, 05:48 PM   #1
david2z4
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Question Conflicting answers on correct offset on 17 inch rims. Help

I have heard two views on correct offset on 17 inch rims. Some say that +53 is the correct offset, and then I also here that +53 is only the correct offset on 16 inch rims, and for ballance a +48-50 is optimal for the 17 inch rim.

Looking at the WRX's with 17 inch rims it looks like the rim is real close to the fender lip and could be the +48-50 range.

I have the Electra-L's 17 x 7 +53 w/215/45-17 Kumho's comming from Chris at TRi right now, and I was getting worried they might rub on the springs or just handle bad if not the optimal offset.

Ok, lets here it....
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Old 10-12-2000, 09:05 PM   #2
david2z4
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I know this subject has been beat to death but, I not really asking what will fit, I'm asking what is the optimal for correct handling/ballance. Thanks, Dave
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Old 10-12-2000, 09:42 PM   #3
GTBGUY
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Dave - Well, I'm not totally 100% sure, but they may rub b/c you're running the higher sidewall. On my GT I run 215/40/17 w/ Prodrive Supertourismo's which have a +55mm offset and it's perfect even after lowering the car ~2" If your car hasn't been lowered you don't have to worry about rubbing b/c it'll be perfectly fine.
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Old 10-12-2000, 09:50 PM   #4
david2z4
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I have stock suspension now, but plan on getting suspension that will lower 3/4 inch.
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Old 10-12-2000, 10:10 PM   #5
markus
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The wheel width will make a difference too. Look at it this way. The stock wheel is 16X7 with a +53mm offset. If you do the math (assuming I'm doing the math correctly), that means the hub face has a frontal spacing of approximately 36mm. Take that same offset with a 7.5" width wheel and the frontal spacing changes to 43mm which means the wheel now "sticks-out" 7mm (~0.25") more than the stock wheel did.

IIRC, the maximum frontal spacing you would ever want is around 48mm. If you exceed that amount, their is a risk that the wheels will begin to rub the fenders.

That translates into a wheel offset of approximately +40mm for a 7" wheel width and about +47 for a 7.5" wheel. The issue now becomes one of what you're doing to the scrub radius, bearing loads, etc, etc, etc. I've heard from numerous sources that it is suggested to not use an offset that is less than +48mm on our cars or your asking for trouble. Try to find something close to the stock offset and you will be fine.

you could also try this link for more info on offsets...
http://www.tirerack.com/wheels/tech/offset.htm

Cheers,
MB

[This message has been edited by markus (edited October 12, 2000).]
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Old 10-13-2000, 08:17 AM   #6
Puckaveli
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I have 17" wheels with a 50mm offset with 215/40/17 Goodyears. I get a light rub from the rear fenders during extreme body roll. A bigger sway bar or stiffer suspension would take care of that though.


[This message has been edited by Puckaveli (edited October 13, 2000).]
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Old 10-16-2000, 04:04 PM   #7
mav1c
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I have the Speedline Prodrive 7 wheels (17") with a 53mm offset and there is NO rubbing ANYWHERE with 215/40-17 tires. Plus a 3/4" lowering from the P1 suspension. I'd stay away from anything more than 48mm offset. Team Dynamics now makes Subaru specific wheels in a 50mm offset.
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Old 10-16-2000, 04:09 PM   #8
SIRS
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I have the team dynamic monza's in 17 and 215/45/17 and haven't had any rubbing yet even in the hard bends. Looks nice too.
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Old 10-16-2000, 04:57 PM   #9
White01
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Got any pics of you car with the Monza's on?? I'm thinking about getting them!!
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Old 10-17-2000, 01:07 AM   #10
david2z4
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I have 17 x 7 inch rim what is the ideal offset. Not what will fit. Symms says +48mm I think. Thanks
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Old 10-17-2000, 06:27 AM   #11
Bob O
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A +40 offset will fit. I swapped the 17x7 TSW Alpine's from my other car for ($34 with new nuts and hubcentric rings) just to see what things would be like. They fit fine except that they rub (in the rear only) during very hard cornering or during hard conering if the road is especially rough or I have passengers in the back. After I get the my whiteline bar from Rallispec I will see if the reduction in body roll will make them behave. Most likely they will go back on the other car as I think they are too heavy (don't know the weight; just that they are heavier than the stock 16" rims). I will attempt to post a pic soon.

Bob
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Old 10-17-2000, 07:12 AM   #12
mav1c
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+40mm fit fine? But they rub? I don't think ANY rubbing is acceptable.
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Old 10-17-2000, 07:57 AM   #13
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I have 17 team loco 143's in a 48mm offset no problems here. http://216.242.153.40/MembersList/Vi...92&PicNumber=2
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Old 10-17-2000, 05:35 PM   #14
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I just bought the Prodrive 7-Spoke rims also. I believe the inside of the rim said it was a +52 offset. I have 205/50/17 tires, and have not had rubbing yet with a full rear seat of RS rims w/Re-92's. I am going to autocross it this weekend. If anything happens, I let you know. I am pretty sure they wont rub. I have eibach springs with stock struts now (3/4"-lower).

Paul G.



[This message has been edited by paultg (edited February 14, 2001).]
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Old 03-21-2001, 03:48 PM   #15
megatron
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Could you guys with P7's PLEASE post pictures of you cars? I'm thinking of getting those rims also, but the only pictures I ever see are extreme closeups.

Thanks!
Andy
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Old 03-21-2001, 04:01 PM   #16
Mark Bebko
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In my opinion your rim and tire choice is optimal.Easily with the stock suspension.I have 17x7.5 50mm and autox regularly on my stock suspension with zero rub.Your additional 3mm will further help to clear. In fact, you should have zero rub with upgraded suspension becuse to body roll will be even less.You made a good choice,don't worry.You are even in a good position to upgrade the brakes with no worries.
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Old 03-21-2001, 04:11 PM   #17
jeffg
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I have an 8.5 inch wide wheel, and it fits. There was some rubbing in the rear til I rolled the fenders. Now there is some rub on hard corners but I expect that. After all it is an 18... see members for pic

[This message has been edited by jeffg (edited March 21, 2001).]
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Old 03-21-2001, 05:00 PM   #18
gtguy
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What you heard is correct, Dave. +53 is the magic (ideal, in response to your query) number for 17x7s, not coincidentally the same offset as Prodrive P1s. I have my GT wagon dropped an inch with the DMS Golds, and the fit is beauteous.

Kevin
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Old 03-21-2001, 08:15 PM   #19
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OK - there are two different issues to consider.

Clearance: maintaining the existing backspacing guarantees you don't hit the suspension. You may still hit the fender. Your track (distance from wheel center to wheel center) will change, this will affect handling and steering scrub. For a 7'5" wheel, a 47mm offset maintains the same backspacing as a 53mm 7" wheel. All that means is it won't hit the strut.

Track: to maintain the same track (wheel center to wheel center) you want the same offset no matter what the width. This ensure the handling remains peachy keen. BUT you have to make sure there are no clearance issues.

Therefore, stick with 53mm offset (or let's say 50-55mm) no matter what width you have and your handling will be fine, assuming they clear the fenders, brakes, struts.

Glenn

[This message has been edited by Glenn Wallace (edited March 21, 2001).]
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