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Author
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Topic: Machining a wheel to change the offset?? Is it possible??
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*EPIK*
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Member # 7481
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posted
 
 
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Originally posted by Blind:
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Originally posted by EPIK:
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Originally posted by Blind:
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Originally posted by EPIK:
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Originally posted by Luke87GT:
Dustin part of the reason that you have to drop it so much to eliminate the fender gap is that your front tires are so short.
I know the 265/35 is a popular front tire choice, but these are big cars (sn95) and I prefer something a little taller which would mean you could have the same fender gap with less lowering
So what size would you recommend for the front? 255/40 or a 275/35??
according to:
http://www.miata.net/garage/tirecalc.html
the stock size tires are 25.7" diameter
your tires (when new) are 25.3" diameter
so you'd be able to raise the front about a 1/2" with the stock size tires (275/35's will be .1" smaller than a 275/40/17)
I currently have 265/35/18's, on an 18X9 wheel.... My stock size was a 245/45/17 on a 17X8 wheel....
245/45/17 is the same diameter as 275/40/17, both are stock size of 25.7" diameter ![[Smile]](smile.gif)
So what front size would you recommend? 255/40/18, 265/35/18, or 275/35/17?
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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iceman302
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Member # 7180
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255/25.4 gives you a width of 10.04" then you take that number and multiply by the aspect ratio (.40). That gives you the height of one sidewall = 4.016" x 2 sidewalls = 8.03 and then you add the rim height of 18". The total tire height is 26.03". There are variations by manufacturer but the calculation is almost always spot on.
That would put you .35" taller than a 245/45/17. You will gain about .7" over the 265/35/18 that you're running by going to a 255/40/18. The other important factor when you're trying to close up fender gap is that only half of the total gain in height is on the top side.
[ June 27, 2009, 01:46 PM: Message edited by: iceman302 ]
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'65 Mustang Fastback
Posts: 4171 | From: Rancho Murieta | Registered: Oct 2006
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poisonpony96
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Member # 3942
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posted
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Originally posted by EPIK:
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Originally posted by poisonpony96:
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Originally posted by EPIK:
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Originally posted by Notch1320:
Has Maximum Motorsports offered any assistance? Those guys are usuallywell versed on this from my past experience with them.
Yup... Those guys are super cool & always offer lots of advice & assistance. They told me to put the stock spindles back on & realign it. I could also mount the control arms in the lower holes, but this will make them angle upward quite a bit & IMO, would defeat the purpose of having the K member at all... My car is lower than they recommend though for optimum handling, but it should still handle good with it set up right...
I had the same issue your having when i had my full setup. never had the front end adjusted but i just moved the control arms to the lower holes. The only issue i would say i had was the front end would break loose first. but like i said it was never adjusted at a shop. I think you on the right path though with trying to change offset on front rim and then put wider ones on when at track.
Which issue did you have? The wheels sticking out, or bumpsteer issues?
I had the issue with the wheels sticking out. I did don't like the look. i had the stock 96 spindles and i had 265/18 up front. once i lowered the mounting point it looked perfect! but does defeat the purpose of having the the upper holes fo the leveling of the a arm to ground.
[ June 27, 2009, 04:07 PM: Message edited by: poisonpony96 ]
Posts: 1183 | From: San Jose | Registered: Dec 2003
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STOCK GT
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Member # 5139
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posted
Being that saleen wheels suck mine was a bit bent from saleen so when i took it to wheel techniques, they said that they would have to machine a bit from the backspacing of the wheel to straighten it up. They didn't take off much at all,as a matter of fact i can't even tell a difference, but i know they can do it, just depends on your wheel backspacing on how much they can cut. hopefully this helped .......
Posts: 104 | From: BAY AREA | Registered: Dec 2004
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by EPIK:
So what front size would you recommend? 255/40/18, 265/35/18, or 275/35/17?
did you run them through the calculator? The closest tire to stock diameter is the 275/35/18, the 255/40/18's are taller than stock and I think would look goofy with proper sized rear tires.
[ June 28, 2009, 02:05 AM: Message edited by: Blind ]
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Poisond Pony
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Member # 5141
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posted
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Originally posted by ugotsmoked:
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Originally posted by 65mustang408:
crackaway racing engines in elk grove off waterman. nice old man i was gonna do the same thing but im just gonna shorten the axle. they specialize in fords.
+1 for crackaway. That dude is cool as hell. go in there with time on your hands, he likes to talk!
haha, yeah, that old man has alot on his mind! Ask him about his '67 Mustang and his plans for it. That conversation is bound to lead somewhere interesting.
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1997 SVT Cobra
very stock, very lame
Posts: 1089 | From: Portland, OR | Registered: Dec 2004
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*EPIK*
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Member # 7481
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posted
quote:
Originally posted by Blind:
quote:
Originally posted by EPIK:
So what front size would you recommend? 255/40/18, 265/35/18, or 275/35/17?
did you run them through the calculator? The closest tire to stock diameter is the 275/35/18, the 255/40/18's are taller than stock and I think would look goofy with proper sized rear tires.
Yeah... I think Im just gonna stick with my 265's because I think they look the best with the 295 rears. Theres something about 275's in the front that looks weird to me???
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
quote:
Originally posted by EPIK:
quote:
Originally posted by Blind:
quote:
Originally posted by EPIK:
So what front size would you recommend? 255/40/18, 265/35/18, or 275/35/17?
did you run them through the calculator? The closest tire to stock diameter is the 275/35/18, the 255/40/18's are taller than stock and I think would look goofy with proper sized rear tires.
Yeah... I think Im just gonna stick with my 265's because I think they look the best with the 295 rears. Theres something about 275's in the front that looks weird to me???
To find the tire height when new take the width and divide by 25.4mm/inch to convert into inches. Than multiply that number by the aspect ratio. Since you have to consider both side of the sidewall, multiply that number by 2 and finally add the rim diameter.
Ie 295/35/18:
295/25.4 = 11.61 inches
(11.61*0.35)*2 = 8.13 inches
8.13 + 18 = 26.13 inches
I personally think the 265-35-18s are way too short for an sn95 with 18s. The 275's look awesome up front if you can get them to fit.
265-35-18: 25.3" -> Too short for an 18" on a big car
275-35-18: 25.58"
295-35-18: 26.13"
305-35-18: 26.41"
[ June 28, 2009, 10:39 AM: Message edited by: Luke87GT ]
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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*EPIK*
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Member # 7481
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posted
quote:
Originally posted by Luke87GT:
quote:
Originally posted by EPIK:
quote:
Originally posted by Blind:
quote:
Originally posted by EPIK:
So what front size would you recommend? 255/40/18, 265/35/18, or 275/35/17?
did you run them through the calculator? The closest tire to stock diameter is the 275/35/18, the 255/40/18's are taller than stock and I think would look goofy with proper sized rear tires.
Yeah... I think Im just gonna stick with my 265's because I think they look the best with the 295 rears. Theres something about 275's in the front that looks weird to me???
To find the tire height when new take the width and divide by 25.4mm/inch to convert into inches. Than multiply that number by the aspect ratio. Since you have to consider both side of the sidewall, multiply that number by 2 and finally add the rim diameter.
Ie 295/35/18:
295/25.4 = 11.61 inches
(11.61*0.35)*2 = 8.13 inches
8.13 + 18 = 26.13 inches
I personally think the 265-35-18s are way too short for an sn95 with 18s. The 275's look awesome up front if you can get them to fit.
265-35-18: 25.3" -> Too short for an 18" on a big car
275-35-18: 25.58"
295-35-18: 26.13"
305-35-18: 26.41"
Mathematically, you are right, but for some reason I prefer the look of a 265 in front??
275/35/18
265/35/18
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=91 Notch:12.31@110 **Under Construction**
=05 CTS-V: 418rwhp/393rwtq=13.01@111
http://www.djepikmusic.com
Posts: 6966 | From: 916 | Registered: Mar 2007
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Luke87GT
Lay'n more stripes
than Caltrans
Member # 21
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posted
ya its not a big difference.
I had a 245-40-18 on my smaller fox which is 25.71" and I thought it was spot on.
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Stangless
Posts: 7802 | From: San Mateo | Registered: Jul 2000
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QuickSparks
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Member # 8826
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posted
To answer the question about whether the mounting pads of the wheel can be machined: I too am considering doing this for my rear wheels, but I have not asked a professional machinist if it is recommended.
As an amateur, I think the limit to the thickness you can remove is presented by the depth of the countersink of the mounting holes. Usually the rest of the mounting pad is hollowed out around the constant-diameter portion of the mounting holes.
Here is a cross section drawing to illustrate my point:
The shaded area represents the maximum thickness that you can remove.
If I were doing it myself, I would find it easier to use a mill instead of a lathe. I would mount the wheel to the table (without the tire) and measure the face runout across the mounting pad in the x and y axes. Then I would use shims under the outboard rim to adjust the runout to less 0.0005" across the mounting pad in x and y axis. I picked that runout because it's the best I could do.
Posts: 27 | From: Benicia | Registered: Dec 2008
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sac 5.0
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Member # 2980
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posted
have you done this yet?saw a set getting done yesterday.try hansens machine shop its near downtown ford in sac
Posts: 1021 | From: sac | Registered: Jun 2003
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