Replacing a Partly Worn Tire?

[Stephen Kormilo]

Bummer. One of the tires on my 2002 A4 quattro received a sidewall 
puncture that cannot be repaired.

What is the group's advice re: replacing a single ~half-worn tire with a 
new one?  There is ~5/32" of tread depth left (~3/32" to the wear bars) 
on the tires, so I am not inclined to replace them all, especially at 
~$240 each installed with all taxes. Will the difference in diameter 
between the new tire & the old ones cause driveline problems, or is the 
difference inconsequential? Are there any other factors that could cause 
problems?

The tires are Bridgestone Potenza RE960AS in 215/55x16 size, if that 
makes any difference.

Awaiting your wise words.

Stephen Kormilo
Nanoose Bay, BC

2002 Audi A4 3.0QM - Silver
Departed:
1998.5 Audi A4 2.8 - Silver
1985 Mazda Rx7 GSL-SE - Black

email: stephen at kormilo.ca