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Old 10-21-2004, 08:30 AM   #1
uncle_el
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running lower offset wheels on a fwd car

can rwd/lower offset wheels fit on a fwd car?

since the "looking to find those jdm wheels" started becoming about lower offset wheels on our fwd cars, due to me, i figured i'd create a new thread.

background info on fwd vs rwd... it's all about offset

the thing that really distinguishes fwd and rwd wheels are the offsets. fwd wheels are generally +35 to +45, whereas rwd wheels are generally +0 to +25. this can make a difference, but this is not to say that it is impossible to fit rwd wheels on a fwd car.
the higher/more positive/further from zero the offset, the closer it is to the vehicle.
the lower/more negative/closer to zero the offset, the further it is from the vehicle.

a spacer reduces rim offset (i.e. makes it lower/more negative/closer to zero) and thus pushes it further from the vehicle.

some more info i found on offset for those interested-
Quote:


Offset is the location of the flat mounting surface of a wheel relative to the wheel's centerline. Negative offset means the mounting surface is toward the center of the car, positive offset means it is toward the outside of the car, or the wheel is "pulled in" toward the center. Offset affects many things other than just whether the wheel has the appearance of "sticking out" past the fender. The wrong offset can cause rubbing problems when the suspension is compressed or the wheel is turned. Offset affects the steering geometry's scrub radius, possibly leading to problems with torque steer or self-centering characteristics. Offset also affects the suspension's motion ratio, which directly determines the effective spring and damper rates. Potentially, in a very heavily loaded vehicle, or with extreme changes in offsets, wheel bearing life can be affected, but this is more often talked about by truck people than by small car enthusiasts. It is very, very important that the proper offset wheels be used.

The formula to find offset located above the photo is incorrect. The correct formula is: Offset = Backspace - (width/2)

While not directly a matter of offset, brake caliper clearance is a related issue. If you have, or plan to have big brakes on your car, be sure that your wheels, or the wheels you are going to use, will fit over the calipers. Spacers are available to solve the problem if they don't, but it is best to get a wheel with enough dish to meet your offset specs and still fit your brakes. Consulting the wheel and brake manufacturers ahead of time is wise. Many aftermarket brake companies even have templates of their brakes available that you can easily check against any wheel.



source: http://www.sportcompactcarweb.com/te...cc_wheelguide/


getting back to the original question: can a rwd/lower offset wheel fit on a fwd car?:

in my search for information, i searched a lot on www.vipstylecars.com . since vip style, at least in some people's eyes, is about running huge wheels with huge lip, i figured i might be able to find some info. i asked a guy (one ton vip) on the site, who seems to be very knowledggeable about wheel issues of all sorts, about running lower offset wheels on a fwd car. for reference, this is his car:




his answer about running lower offset wheels on a fwd car:
Quote:


With a little bit of extra work, you can actually fit a lot wider and lower offset wheels on a fwd car than most people would think. For example, I had always been told that you'd be lucky to fit anything more than a 7.5", +32mm on a honda civic... well, here's some 17x8", +25mm we put on a friend's civic for kicks:




I would reocmmend checking out stylewagon magazine if you're near a japanese bookstore for ideas too, because that's where you'll see most of the crazy fixed up fwd cars, including accords every so often...

the best way to determine how wide/low offset you can go is to take your existing setup, and measure the clearance that you have now, and go from there. Try and see how much room you have between the outer edge of your current wheels/tires and about a few mm beyond the middle of your fender lip. I'm willing to bet that you've got AT LEAST an inch. so if you rolled your fender lips flat... and ran even just another deg of negative camber all around, you could probably fit something along the lines of a 17x8", +20mm or so... just to give you an idea...


so, it seems with some modification (rolling fenders, running negative camber), it can be done.
not sure if i'll do it, but wanted to present the information to everyone interested.
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Old 10-21-2004, 08:34 AM   #2
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scion xb:

stock wheel is 15 inch, 5.5 inch wide, +38 offset.




these wheels are 18 inch, 7.5 inch wide, +30 offset in front.
18 inch, 8 inch wide, +25 offset in the rear.
run with a quarter inch spacer.
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Old 10-21-2004, 09:21 AM   #3
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I have been wondering about this very same thing. Elliot is the man
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Old 10-22-2004, 01:23 PM   #4
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wow! elliot you are now the info king of the world!

That makes me want to get some advans again
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Old 10-23-2004, 08:32 AM   #5
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yet to be confirmed, but from one ton vip, it seems as though we should be able to fit a wheel that is :
17 x 8
+20 offset

with rolling the fenders, both front and rear; and stretched tire- a 205/35 to 45 or a 215/35 to 45.
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Old 10-23-2004, 08:46 AM   #6
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Quote:
Originally posted by uncle_el
yet to be confirmed, but from one ton vip, it seems as though we should be able to fit a wheel that is :
17 x 8
+38 offset

with rolling the fenders, both front and rear; and stretched tire- a 205/35 to 45 or a 215/35 to 45.

it can be done el..i had a set of DTM rims awhile back, they were 17x8 with a +38 offset, but i had my fenders cut in the rear, instead of it being rolled. the tires on there were 215/45/17, but definetely not a problem gettin wider rims on if u wanted too.
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Old 10-23-2004, 08:51 AM   #7
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Quote:
Originally posted by PRIMOCB7
it can be done el..i had a set of DTM rims awhile back, they were 17x8 with a +38 offset, but i had my fenders cut in the rear, instead of it being rolled. the tires on there were 215/45/17, but definetely not a problem gettin wider rims on if u wanted too.
really?!?!?!
any chance you have any pics?!
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Old 10-23-2004, 09:00 AM   #8
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Quote:
Originally posted by uncle_el
really?!?!?!
any chance you have any pics?!
as a matter of fact, i do, but i i gotta have my girl scan them..so maybe sometime next week, i'll have them up.



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Last edited by uncle_el; 04-08-2005 at 06:26 PM. Reason: pics, 6 months after request!!!!!
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Old 10-23-2004, 08:10 PM   #9
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I definitely want to see these pics also.
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Old 10-25-2004, 10:23 AM   #10
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Wouldn't that mess up your bearings?
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Old 11-24-2004, 05:50 AM   #11
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just to help you guys out, check out the link below. you can use this as a reference point when buying wheels that have offset other than your usual 7 inch wide +40mm offset rims

wheel offset calculator
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Old 11-24-2004, 09:08 AM   #12
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Quote:
Originally posted by weneklek
just to help you guys out, check out the link below. you can use this as a reference point when buying wheels that have offset other than your usual 7 inch wide +40mm offset rims

wheel offset calculator
i've seen that wheel calculator before, but it doesn't really help you in terms of practicality... as it doesn't take into account the car type, and thus the specifics of the car: suspension, fender wells, etc. it also assumes the current wheels on the car have perfect clearance, which they may not.

many places that sell wheels won't sell and install wheels that are designated as rwd for a fwd car. from experience, when i've gone to a wheel shop, they'll show the fwd wheels, but not any rwd wheels that may fit. i suppose there are many issues (cosmetics, fender rolling, tire stretching) that may get in the way of shops wanting to sell the rwd wheels... but we could at least try, lol.

primocb7, where are those pics?!?!?!?!?
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Old 01-24-2005, 01:46 PM   #13
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another thread that may be of some help
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Old 03-25-2005, 08:39 PM   #14
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been doing some thinking... if you run 96 itr wheels, which have a +38 offset, you either shave the calipers, or run a 5mm spacer... and that's not flush with the fender... which really makes me think the super advans and other low offset wheels may be doable without fender rolling, provided the wheel is not 17 inches in diameter.
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Old 03-26-2005, 12:29 PM   #15
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low offset wheels are doable just like you said in your first post but only to a certain limit of course. i always hated the ITR wheels for having too little positive offset. it doesn't look proportional to the fender at all.

a reason why i don't think some wheels with low offsets won't work is because of the front caliper clearance issue on top of the fender clearance. too much negative offset won't clear the calipers just like too much offset. you have to find a good balance of min and max.
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Old 03-26-2005, 12:57 PM   #16
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Quote:
Originally Posted by timmy0tool
low offset wheels are doable just like you said in your first post but only to a certain limit of course. i always hated the ITR wheels for having too little positive offset. it doesn't look proportional to the fender at all.

a reason why i don't think some wheels with low offsets won't work is because of the front caliper clearance issue on top of the fender clearance. too much negative offset won't clear the calipers just like too much offset. you have to find a good balance of min and max.

fender clearance can be solved with body work, great fender rolliing diy/how to on vipstylecars.com

the caliper clearance is an issue... that could be solved with a spacer (perhaps larger than the standard 5mm) and shaving of the caliper. the civic pictured in my 1st post has a 17x8 wheel with +25 offset, with no modification... and right now i'm running a 15x7 wheel, +38 offset, with a 5mm spacer with no problems, and a bit more space 'til the fender.

i just think we can get a little more aggressive with our wheel choices than the standard website/tire shop offerings.
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Old 04-05-2005, 07:01 PM   #17
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info lost when the forum went down a few months ago.

super advan ii's (look right)


super advan racing version ii's
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Old 06-07-2005, 12:51 AM   #18
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to resurrect this thread: can +50 offset fit our cars or is that too much? a 5mm spacer will bring it down to 45mm so that should be tolerable correct?

also what's the widest rim you can stick in our fenderwells? 8"? 9" maybe? just curious .
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Old 06-07-2005, 01:09 AM   #19
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Well, just so you know, Prelude SI rims have a 55mm offset. Legends have 65mm. So, yes, they'll fit (at least in terms of a 15" rim). The problem with going from something like a 55 to a 35 is that it increases torque steer by a lot. Trust me. A LOT
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Old 06-11-2005, 05:27 PM   #20
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Quote:
Originally Posted by timmy0tool
to resurrect this thread: can +50 offset fit our cars or is that too much? a 5mm spacer will bring it down to 45mm so that should be tolerable correct?

also what's the widest rim you can stick in our fenderwells? 8"? 9" maybe? just curious .
+50 will likely fit without a problem... but that's more of a guess than practical experience. assuming the wheel isn't too wide (8 inches or greater) you should be fine.

as far as wide wheels... i guess it depends on whether you have a lowered suspension or not. if i remember correctly, you have neuspeed race springs (i'm on crappy dial up at the moment, and it would take me too long to check your member's ride thread). with an 8 inch wide wheel, depending on the offset, you may have to roll and/or cut the rear fenders. primocb7 had 17 x 8 wheels with a +38 offset (pictuers earlier in this thread) and needed to cut the rear fenders.

so... i'd think 7.5 inches wide you wouldn't need to roll and/or cut the rear fenders until maybe an offset around +30 (maybe a little lower), an 8 inch wide wheel apparently you'd need to cut it at +38, and a 9 inch wide wheel would likely need the rear fenders rolled and/or cut regardless of the offset).
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