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02-06-2001, 01:28 PM | #1 |
Scooby Newbie
Member#: 3550
Join Date: Jan 2001
Location: Shirley, MA, USA
Vehicle:2002 WRX Wagon Blue |
Disadvantage of 48mm offset vs. 53mm?
I understand what the different offset numbers mean. Subaru uses 53mm, while I've seen some people say don't use anything less than 50mm, and others say 48mm is ok.
Besides the risk of having the tires rub the fenders, is there any other downside to using a 48mm offset? Is there any change in handling since each tire is moved 5mm farther out from the center of the car? Eric
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02-06-2001, 03:52 PM | #2 |
Scooby Guru
Member#: 114
Join Date: Jul 1999
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MWSOC
Location: Wichita, KS and Whoring, OT
Vehicle:'03 Evo, Rice White '01 Erion CBR 929 |
Besides the risk of the tire hitting the fender lip, the only issue is increased load on the wheelbearing. This is easy to imagine, just think of the decreased offset being like a lever arm. Calculate where the center of the tire's width lies vs. where it did originally and you know how much more force is going to be exerted on the wheelbearing. 5mm is pretty minor, IMO.
Now say you were running really short tires on a 35mm offset and a stiff suspension. They don't rub so there's no problem, right? Do the calcs again and now see what is happening to your wheelbearing... |
02-06-2001, 04:53 PM | #3 |
Scooby Specialist
Member#: 989
Join Date: Feb 2000
Location: New York
Vehicle:99 RS Turbo Graphite Gray Pearl |
+48 mm offset is not too bad.
should not have too much problem since most of the impreza that i see in the japanese magazines runs from +48 mm offset to a +53mm offset. but most of them use a +48mm hope this help michael |
02-06-2001, 07:36 PM | #4 |
Scooby Specialist
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Join Date: Nov 2000
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SCIC
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Vehicle:02 duburu arr exu |
i dunno much bout this stuff but isnt the +48mm offset for 17x7.5 inch rims?
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02-07-2001, 12:20 AM | #5 |
Scooby Specialist
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Join Date: Mar 2000
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BAIC
Location: San Jose, CA
Vehicle:2005 STi White |
My rims are +48. 17x7.5. You'll rub if you lower it alot. I have it lowered to the point where it doesn't rub and it's still pretty low.
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02-07-2001, 09:31 AM | #6 |
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Join Date: Apr 2000
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E. Canada
Location: Toronto, ON
Vehicle:1997 GF - silent ed. [email protected] untuned |
Should a drop of less than an inch with a 215/45/17 on 17x7 rims be a safe bet to be rub-free?
My worry is (I've heard though not personally seen) that not all tires of the same stats are identical, some may be slightly wider or narrower than others. |
02-08-2001, 12:46 AM | #7 |
Scooby Specialist
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Join Date: Mar 2000
Location: Ventura, CA
Vehicle:MY00 RS BRP |
The same stated size can vary by 1/2" to 3/4". Each manufacturer has a website...if you're running a close-to-bad offset, you might want to check the actual tire width via the websites before buying a particular brand. If you're running a "good" offset, shouldn't matter if you keep the width sane.
Julian |
02-08-2001, 01:42 PM | #8 |
Scooby Newbie
Member#: 3578
Join Date: Jan 2001
Location: Canada
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Why don't you ask Imprezer, I'm pretty sure he's got a pair of Advan TCs (48mm) on his car, and it looks pretty low to the ground-
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