tire size combos?

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tire size combos?

Post by 60andslow on Tue Apr 09, 2013 11:00 pm

ill be running a set of offset fuchs, she will be nasty low 6in beam drop spindles but before i order tires ide like some help and insite on tire combos that have worked well w low cars im just worried ab the rears rubbing . im pretty sure i want to run 145s in the front. 145 55 15 or 145 60 15. but i have no clue what on the rear. thanks guys
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Re: tire size combos?

Post by bakertim2 on Tue Apr 09, 2013 11:05 pm

You really need to know the offset of the Fuchs. You can test fit the wheels and see where they sit. Then from there you can get a better idea of what tires will work.
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Re: tire size combos?

Post by 60andslow on Tue Apr 09, 2013 11:07 pm

how do i measure the offset? measure the width of the rim?
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Re: tire size combos?

Post by bakertim2 on Tue Apr 09, 2013 11:09 pm

Lay a straight edge on the edge of the rim from the back side then measure down to the surface that would be sitting against the drum.
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Re: tire size combos?

Post by 60andslow on Tue Apr 09, 2013 11:24 pm

ok so i measured from the back and both rims (one of the front) and (one from the rear) and its both 5" the rears are slightly larger meaning just a slight bigger outter lip. now when i measured the front face of the rim the rear (slightly larger rim) from the flat part where the bolt holes are to a flat edge the outside its 2 1/2 " and only 1 1/2 on the front rim.
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Re: tire size combos?

Post by bakertim2 on Wed Apr 10, 2013 12:22 am

Call me tomorrow.
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Re: tire size combos?

Post by callahan on Wed Apr 10, 2013 12:57 pm

That's how you measure back spacing not offset. How wide are the wheels?
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Re: tire size combos?

Post by bakertim2 on Wed Apr 10, 2013 10:58 pm

Okay, Callahan is correct in saying that is measuring the back spacing. Offset refers to the mounting surface in relation to the center line of the wheel. In order to figure that offset one needs to know the width of the wheel and the backspacing, in order to calculate the offset of the wheel. The formula then would be backspacing-(width/2) Is that correct?
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Re: tire size combos?

Post by Attack chicken on Fri Apr 12, 2013 8:50 pm

60andslow wrote:ill be running a set of offset fuchs, she will be nasty low 6in beam drop spindles but before i order tires ide like some help and insite on tire combos that have worked well w low cars im just worried ab the rears rubbing . im pretty sure i want to run 145s in the front. 145 55 15 or 145 60 15. but i have no clue what on the rear. thanks guys

What's your idea of nasty low? One guys low is another guys 4x4.. 145/65/15's on the front will drag pan and still turn with the proper beam/frame head placement. You can get fairly low with 165/80's out back but even with tubs they can hit the body before a flat pan will sit on the ground although some very carefully selected wheels may help that I don't think It will happen without raising the fender arch. The 185/60/15 will let you cruise 1 in. off the ground at the torsion housing and have some suspension movement with the ability to pretty much lay the fame horns in the dirt. Of course this is with smoothie offset and YMMV with Fuchs. How much work are you looking to do to the pan and body for the low to happen?

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Re: tire size combos?

Post by 60andslow on Fri Apr 12, 2013 10:24 pm

6in beam. adjusters. 2 and a 1/2in drop spindles. 4in drop plates and some splines. my debate was 145 -65 - 15 or 145-55- 15s up front. and i beleive ill go w the 145-65's . and i was thinking 185 - ? in the back but not sure on the profle i want back there. and i cant really measure the back rims untill i get the huge tires that came on it dismounted. lol
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Re: tire size combos?

Post by Attack chicken on Sat Apr 13, 2013 10:15 am

Here is a link to a really good tire size calculator.
http://www.miata.net/garage/tirecalc.html
You can get a good idea of what sizes are similar in real time diameter. 125 temps and 145/65 is a good example. check out the difference between a 165/80 and a 185/60.

If you are not planning on frame head mods then you will have to do something about the headlight buckets to get real low and still be able to turn even with small tires. Tie rods may hit also..Not trying to bust your balls but you really should come up with a number in inches you want under the car and this will lead you in the direction you will have to take to get it. I would guess the offset on the wheels will probably help not hurt the rear but you will have to know that as well, may be a different story up front..could cause your 6 in beam to be a 4 in. Question

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