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Re: Need Wheel/Tire Help (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by Bob on January 21, 2001 at 00:38:35:

In Reply to: Need Wheel/Tire Help posted by Trip on January 20, 2001 at 22:28:00:


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


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