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Tires And Wheel/rims Fitment Guide


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But, Marshal.... I've fit 195/55 more than a few times. And he's right, the height is correct to stock. 205/50 is the same.

Tom Jones

BMW mechanic for over 25 years, BMWCCA since 1984
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 585k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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you are right Tom. by diameter the stock 165/80 13 and 195/55 15 are darn near the same, and fit on stock ride height.

 

"keep speedo correct"    what 2002 has a correct speedo?  :lol:  ....

 

most folks running 15's are also lowered.  the 55 series starts running into body interference issues.  the 195/50's are good compromise.   the 195/50 is less than 2mph different at 60mph based on rolling diameter. 195/45 works better for lower cars...who also want to accelerate faster. :)

Edited by mlytle

2xM3

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Larry,

   All things being equal with the wheels as far as the width goes. ( I did the figures with 13x6 and a 15x6) you should only gain about 6.6mm of wheel gap.

           

                                  Old            New    

Diameter                  589.2mm  576mm  

Circumference       1851mm   1809.6mm  

Poke                         38.2mm    38.2mm  

Inset                        114.2mm   114.2mm  

Speedo error             0%          2.29%  

Reading at 30mph   30mph     30.69mph  

Reading at 60mph   60mph     61.38mph  

Ride height gain      0mm       -6.6mm  

Arch gap loss            0mm      -6.6mm

 

I encourage you to play around with the tool below, its where i got these numbers from.

www.willtheyfit.com

Edited by bmore2002
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    Old New     Diameter 589.2mm 576mm   Circumference 1851mm 1809.6mm   Poke 38.2mm 38.2mm   Inset 114.2mm 114.2mm   Speedo error 0% 2.29%   Reading at 30mph 30mph 30.69mph   Reading at 60mph 60mph 61.38mph   Ride height gain 0mm -6.6mm   Arch gap loss 0mm -6.6mm

 

I actually went to willtheyfit.com and put the specs in and got the same as you. What I dont understand is the Arch gap loss of -6.6mm...Does that mean it will have 6.6 mm more of a fender gap or less?

72 Tii

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C'mon Chito. It can't do everything for you. Lol. But if you are lowered and your currently rubbing it will let you know what tires will give you more clearance. Ie my my 185/55/15 were rubbing under load and it told me that the 165/55 would give me just enough clearance.

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Did I make a mistake and if so, can I fix it.

 

I bought some 15x7 et25 rims. I didn't check he backspacing before i bought them (from mounting surface to outer lip) Now I measure and it is about 5 1/16". Now I find out it should be about 4.5". Will it work? If not, is there something I can do?

 

Edit: The specs say the backspacing is 4.98

post-41350-0-96814400-1379171246_thumb.j

Edited by LarryS

72 Tii

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I havent got tires yet...I just put the rim on to see if I was going to need longer studs...(at this point, I don't...at least on the fronts) As the crappy picture above shows, there is less than a 1/4 of space between the tie rod rubber and the outer lip.

Edited by LarryS

72 Tii

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