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305/35r18

This is a discussion on 305/35r18 within the Wheels and Tires forums, part of the General Help category; Would this fit under the rear of my 02 SS without rubbing? Current wheels are 18x10.5 and I'm running 295/35R18. ...

  1. #1
    COME AT ME BRO Soltakr's Avatar
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    305/35r18

    Would this fit under the rear of my 02 SS without rubbing?

    Current wheels are 18x10.5 and I'm running 295/35R18. Would like to go with 305 but its pretty tight fit now. Anyone try this?
    (2002 SS 6spd) SLP lid & scoop,NX wet kit & maf, NGK-TR6,160',MSD,Kooks LT & y-pipe,SLP Dual center exhaust,cut-out,tuning SUSPENSION Chromoly k-member, Chromoly adjustable upper and lower a-arms,koni s-adj,Eibach sport springs,Wilwood brakes,SB,BSK,TA,TAB,SFC,PHB,ST,18x9.5&18x10.5, Nittos

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    Crazy Canuck ! Eugenio_SS's Avatar
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    you should get 30 profile..
    I have NT01 315/30-18 on the C6 18x10.5
    pix in signature.
    Eugenio_SS
    almost stock triple-black 2000 SS convertible with 17x11s on all 4 w/ 315s at the track or on the street with 18x10.5s on all 4 w/ 315s: (1), (2)

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    USMC Y2K_CAMARO's Avatar
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    I'm not really sure what the whole difference between profiles are. What does that number measure?

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    Crazy Canuck ! Eugenio_SS's Avatar
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    profile means the % relative to the width is the sidewall.
    For example: 315/35-17 means it's a 17" tire, 315mm width.
    35 means that the sidewall is 35% of 315 = 0.35x315 = 110.25mm = 4.34"
    Since there are 2 sidewalls (below + above the wheel), the overall diameter = wheel size + 2x sidewall.
    Which in this case would be 17" + 2x 4.34" = 17 + 8.68 = 25.68" overall diameter.

    This is what the #s mean.
    Now, what's important about getting different tire sizes, is to keep the Overall Diameter (OD) pretty close to stock, so that it doesn't affect the speedometer, and you will have less clearance issues as well.

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    USMC Y2K_CAMARO's Avatar
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    A little confusing, but I think I got it

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    COME AT ME BRO Soltakr's Avatar
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    I understand the measurements fine. But some time if the numbers add up right you still have a little fitment issue. When I did the math it is right to the limits but I know the car isn’t perfectly built. The rear axle sits slightly off to one side on my car. So the passenger side has a little more clearance to fender but tighter on the body side, and visa versa. I wouldn’t normally try to run this size but I got a chance at some Nitto's with 5 miles on them for $100.00 so I worth it to try and find out.

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    Crazy Canuck ! Eugenio_SS's Avatar
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    Quote Originally Posted by Y2K_CAMARO View Post
    A little confusing, but I think I got it
    here is a file w/ the overall diameters for all (a lot) sizes
    Overall Diameter Table

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    Crazy Canuck ! Eugenio_SS's Avatar
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    Quote Originally Posted by Soltakr View Post
    I understand the measurements fine. But some time if the numbers add up right you still have a little fitment issue. When I did the math it is right to the limits but I know the car isn’t perfectly built. The rear axle sits slightly off to one side on my car. So the passenger side has a little more clearance to fender but tighter on the body side, and visa versa. I wouldn’t normally try to run this size but I got a chance at some Nitto's with 5 miles on them for $100.00 so I worth it to try and find out.
    adj. PHR will fix that.

  9. #9
    COME AT ME BRO Soltakr's Avatar
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    Quote Originally Posted by Eugenio_SS View Post
    adj. PHR will fix that.
    Aw, good thinking.

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