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widening a 9in rim

This is a discussion on widening a 9in rim within the Wheels and Tires forums, part of the General Help category; I will be ordering the RPM 505 rims later this winter only come in 9in wide if i widen the ...

  1. #1
    Member devildogws6's Avatar
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    widening a 9in rim

    I will be ordering the RPM 505 rims later this winter only come in 9in wide if i widen the rim to 10.5 or 11 should i get a special or differnt backspacing or offset to prevent any rubbing issues on the inerside?

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    Former Mopar Man 2002ssslp's Avatar
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    I would check with the company that is doing the work. I don't think you can just split and widen a rim without changing the backspacing. They should know what to do when they widen the rim.
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

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    Moderator 98TransAmWs-6's Avatar
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    I was told by weldcraft wheels that the amount you widen a wheel changes the back spacing by that much.
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    yes thats true unless you have really deep dished rims and make the cut in front of the spokes....

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    Member devildogws6's Avatar
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    So I should find a place that will widen rim first before I purchase wheel? I believe the dish is 3" well the lip is, thanks for the input.


    Owning a 9 sec ricer is like coming out of the closest: at first you'll surprise everyone, but in the end you're still gay

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    Senior Member tatertot91's Avatar
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    For the cost of buying those wheels and having them widened i'd seriously consider trying too find a nice set of wheels that are the width you want. Not a bad looking wheel, but once you start spending money to ship them out and have them widened you could probably pick up nicer wheel imo. If you do decide to get them widened, i'd go with weldcraft. Heard nothing but good things about them.

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    Smiles for 9.5 Years cammed goat's Avatar
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    ^^this.

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    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by tatertot91 View Post
    For the cost of buying those wheels and having them widened i'd seriously consider trying too find a nice set of wheels that are the width you want. Not a bad looking wheel, but once you start spending money to ship them out and have them widened you could probably pick up nicer wheel imo. If you do decide to get them widened, i'd go with weldcraft. Heard nothing but good things about them.
    This is a good point. I bet shipping wheels alone is very expensive.

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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    Quote Originally Posted by tatertot91 View Post
    For the cost of buying those wheels and having them widened i'd seriously consider trying too find a nice set of wheels that are the width you want. Not a bad looking wheel, but once you start spending money to ship them out and have them widened you could probably pick up nicer wheel imo. If you do decide to get them widened, i'd go with weldcraft. Heard nothing but good things about them.
    This is a good point. I bet shipping wheels alone is very expensive.
    Yes it is I shipped my 4 ws6 wheels with tires and it was $230 from VA to Oregon.

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    Member devildogws6's Avatar
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    the only other close rims i saw are the Fiske fm10 that would allow my 11inch in the back but damn $800 a rim!!! Yikes

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    Senior Member tatertot91's Avatar
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    After shipping back and forth and widening you'll be pretty high in price. I'd be on the lookout for some lightly used fm10s, you won't regret it.

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    Member devildogws6's Avatar
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    Quote Originally Posted by tatertot91 View Post
    After shipping back and forth and widening you'll be pretty high in price. I'd be on the lookout for some lightly used fm10s, you won't regret it.

    if you ever see any let me know lol

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    Junior Member fjm1235's Avatar
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    I have the same challenge. My current wheels are only made in 18 x 9, but I need to widen them to 10.5 to gain better traction. The current 9" wheel only allows me to run 275's all around. I do not want to tub the wheel wells. Is anyone running 18 x 10.5 in the rears? Looking to run 305 drag radials for the strip & 315's for the street. Any guidance is appreciated.

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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by fjm1235 View Post
    I have the same challenge. My current wheels are only made in 18 x 9, but I need to widen them to 10.5 to gain better traction. The current 9" wheel only allows me to run 275's all around. I do not want to tub the wheel wells. Is anyone running 18 x 10.5 in the rears? Looking to run 305 drag radials for the strip & 315's for the street. Any guidance is appreciated.
    I have 20x10 in the rears with no issues. I have a couple of inches to spare also.

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