From Motorcycle USA:

For the month of August, Avon Tyres has released information about a promotion where you can pick up a free tire. All you have to do is purchase a rear Avon Viper Sport or Supersport, retain your receipt, fill out and then print the promotion form, and mail it in within 10 days. An $18 shipping fee applies, tires must be purchased during the month of August, and there is a limit of one promotion entry per household. For more information read the Avon press release below and consult the promotion website for all the details.

Avon Tyres announces "Buy One Get One Free" Viper tire promotion for the month of August. When you buy one rear Avon Viper Sport or Supersport tire receive the front tire for free. There will be an $18.00 freight charge applied to the customer's order of the front tire. Promotion ends August 31st 2006. Go to www.avonmoto.com for all the details and entry form.

http://www.avonmoto.com/contests/contest.asp
http://www.avonmoto.com/contests/contest.asp