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In Reply to: Re: Need Wheel/Tire Help posted by Bob on January 21, 2001 at 00:38:35:
I assume you have the standard 14"X6.5" wheels, and I would not go wider than 60 series on hese wheels.
The 205/60 will work, but are about 15% smaller diameter and will alter your speedo readings while upping your revs at any speed. It has the effect of lowering your differential ratio (if it's a 3.25)to about the equivalent of a 3.73 on 195/70 tires.
You could use 225/60-14 and everything will stay the same since they have the same diameter and rolling circumfrence.
You can do the math:
195X0.7/.6= 225, hence 225/60-14
To find the tire/wheel diameter take the width (195) times the aspect ratio (.70) and double it (X2) and add the wheel diameter.
195mm X 0.70 X 2= 273mm/254.mm per inch= 10.75 inches + 14 inches = 24.7 inches.
225mm X 0.60 X 2= 270mm/ 25.4 mm per inch= 10.63
inches + 14 inches = 24.63 inches
Bob
Now that we're done with all the math,in practical terms a 205/60/14 will act better than the 195's you have now.Using a 225 size tire on a 14" rim,with the weight of your car, will cause too much weight transfer in corners,and be worse,not better.
If you plan to keep the car,invest in 15" or 16" wheels,and use a 50 or 55 series tire.Far better handling,safety,and stability.Otherwise use a GOOD "H" rated or better 205/60/14 tire.
I specialize in setting up BMWs for street/track,mostly stock and/or extreme mods.,and will be glad to discuss it if you can catch me here.
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