NEED ADVICE ON TIRES REPLACEMENT QUICK.

[jspdr]

I brought my truck in for a recall and other service done at the dealer. When i picked up i discovered that they have damaged one of my front tire and rim. Came back spoke to service manager and he agreed to replace new tire and fix the rim. It is 2008 X5 with 20' staggered, and about 40% left on them. So, my question is if i replace one new tire, will it affect the handling, or will cause damage to awd system? As a matter of fact, does BMW even recommended for doing this. I asked the service director this question, he said not sure, he will contact BMW technical support and get back to me. Any info is appreciated.