more ?s about tires

[Ameer Antar]

there are tire calculators here:

http://www.mgb.bc.ca/misc/tirecalc.html

at the bottom you can plug in the tires size, ie. 205-60-15, and it will 
give you the o.d. The 205 is the width of the tread in mm. The 60 is the 
percent of the width [60% of 205mm] that is the height of the sidewall. The 
15 is obviously the wheel diam. Once you know what the o.d's are, you can 
compare the original tire size to the new tire size and see how much it 
will affect the speedo by using the calc. at the top. The middle calc's are 
for finding gear ratios and such. good luck.

-ameer
'84 5kT


At 08:04 AM 10/11/00, you wrote:
>Hi gang,
>
>Just wondering if someone could clarify something for me.  The Tire
>Rack person I spoke to suggested a set of 15 inch snows despite the
>fact that my summer wheels are 16 inch.  Specifically, they suggested
>195/65QR15 Blizzak WS-50 tires mounted on steel wheels.  My '01 A4
>sport package came with 205/55ZR16 Dunlop SP8000E tires.
>
>Is the outside diameter of these two tire/wheel combos the same?  The
>Tire Rack guy said no problem.. but I want to double check before I
>mount these.  Can anyone point me to a good URL which explains what
>all these numbers actually mean?
>
>A Quattro with serious snow/ice/mud tires should be just about
>unstoppable, I would think.. although the old joke may apply: with 4
>wheel drive you can get stuck so badly that nothing short of an Army
>helicopter can get you out.  ;-)
>
>Thanks,
>Bob