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Last Post 16 Apr 2013 05:49 PM by  ron
Stock Class, 18x9, 265/35/18 or 285/30/18?
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OasisTan
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15 Apr 2013 02:50 AM
    If you were running stock class with an 18x9 rim, would you run a 265/35/18 or a 285/30/18(basically same height at 25.0/24.9)?
    265/35/18 (4)
     50%
    285/30/18 (4)
     50%

    Stock Class on18x9 wheels, -1.0 camber up front, fairly stiff suspension, AWD, 3000lbish car, 250ish HP.  Tire choice is a BFG 265/35/18 or 285/30/18?  Both sizes are basically the same height at 25.0/24.9" tall.  BFG seems to run wide as well. 

    Which would YOU go with?  

    snaponbob
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    15 Apr 2013 10:36 AM
    Oh ......... gee. Why do you ask?
    snaponbob
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    15 Apr 2013 10:42 AM
    Posted By OasisTan on 15 Apr 2013 02:50 AM

    Stock Class on18x9 wheels, -1.0 camber up front, fairly stiff suspension, AWD, 3000lbish car, 250ish HP.  Tire choice is a BFG 265/35/18 or 285/30/18?  Both sizes are basically the same height at 25.0/24.9" tall.  BFG seems to run wide as well. 

    Which would YOU go with?  

    More seriously, assuming R-comps, WHICH one? Also, clearance is a serious issue sometimes. (Recall LAST SUNDAY !!!) BAsed on the size choices, you are looking at BFGs. (No surprise THERE.) Less "pinching" = more less sidewall deflection. 


    ratt_finkel
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    15 Apr 2013 01:02 PM
    I voted the 265. The 285's are massive. And even on 10.5" rims are not stretched.
    gbeaird
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    15 Apr 2013 01:11 PM

    I didn't vote, but I'd also start with the 265s.  Remember that you have modification limitations in Stock classes, so bigger tires usually make up for other ills in a particular car's chassis design/layout. 

     When we autocrossed our 86 SVO, I was able to fit, and the car was faster on the 265s we were using, vs. the 245s we started with (stock tire was a 225).  But on that car, there was no opportunity for camber adjustment over the stock range, so even with the top of the struts pushed fully-in towards the center of the car and the bottom of the strut-to-spindle mount pushed fully in at the top, we could only get about -1/2 deg.  So, the bigger tire still put more tread on the ground in the turns, which really helped with turn-in.

     So, I'd start with the 265s and see how that fits all the way around the car, then try a set of 285s when the first wears out, if you have space.  

    The Nebulizer
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    15 Apr 2013 04:44 PM
    I can't understand why, aside from fitment, you would choose a 265 over a 285 on an 18x9. Plenty of wheel for this tire. 
    newportroyal
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    15 Apr 2013 08:20 PM
    285's.

    ratt_finkel
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    16 Apr 2013 12:50 PM
    Posted By The Nebulizer on 15 Apr 2013 04:44 PM
    I can't understand why, aside from fitment, you would choose a 265 over a 285 on an 18x9. Plenty of wheel for this tire. 

    Numbers lie.  These are not traditional sized 265 or 285's.  Craig knows this.  But you do bring up a good point, there are numerous examples of large tires and small rims equaling a winning combo.  

    The Nebulizer
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    16 Apr 2013 04:45 PM
    Posted By ratt_finkel on 16 Apr 2013 12:50 PM
    Posted By The Nebulizer on 15 Apr 2013 04:44 PM
    I can't understand why, aside from fitment, you would choose a 265 over a 285 on an 18x9. Plenty of wheel for this tire. 

    Numbers lie.  These are not traditional sized 265 or 285's.  Craig knows this.  But you do bring up a good point, there are numerous examples of large tires and small rims equaling a winning combo.  

    I'm running 295 A6 on 18x8 which is not uncommon. I don't know anything about the BFG though. How do their sizes compare?
    snaponbob
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    16 Apr 2013 05:37 PM
    Having pounded around with 295 and 315 x 18 A6s on various width rims, squeezing 295s on 18x8s "works", but 9s or 10s would REALLY wake them up.
    ron
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    16 Apr 2013 05:49 PM
    265 they aren't designed like the hoosier with the cantilever bead design and they run wider  
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