Broken Belt -- Need 1, 2, or 4 tires?

I have a broken belt in one of my A6 Quattro. Other tires have 8mm tread remaining. Can I get away with buying only one tire? Or do I have to buy two or four?
How much tread difference is needed to cause problems with the diffrentials on a Quattro?
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I'd order just 1 from TireRack, but ask them to shave off a couple of mm before they ship it.
Cheers,
Pete
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writes

LOL, hey Victor, lets see if that new Remington can cope with vulcanised rubber! :)
--
Toby

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LOL! I was actually serious though. I know they shave and heat-cycle track tires for customers, so I'm sure they could do it for a street tire, too. Just have to make sure it's the exact tire model as the other 3 he has on the car.
Cheers,
Pete
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Pete's suggestion was NOT meant as a joke. Consider this as a learning experience!!.
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better yet send them the old tyre and have some more rubber stuck on........
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mm
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Shave your tires??
Jesus guys, why would you pay for a new tire to immeadiately take a couple of thousand miles OFF its life!!
This is an Audi NOT a Volvo 4wd. Volvos you DEFINATELY have to change in pairs. The Audi Quatro system automatically compensates for different tire dimensions when you change tires.
John A6Q 2.8 (UK)
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The previous remark was largely satire, but not completely without merit.
Tire shaving is a common practice for competition tires and Tire Rack is one of (if not *the*) the first commercial operations to make it widely available to anyone who wants to pay a few bucks for the service. In this case, it would effectively 'match' the tire with the remaining worn tires.
Tread squirm adversely influences handling, so autocrossers and a few track junkies will have the 'excess' shaved off. I always thought the old Bridgestone commercials demonstrating how *worn* tires handled as well as brand new ones were hilarious. Well, DUH! If it's on dry pavement, they handle *better*! Every *true* autocrosser I know looks at a set of 'bald' tires and, instead of thinking: "Needs new tires," thinks: "Ahhh! Competition depth!" -- C.R. Krieger Been there; done that
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