I came across this post after going back and forth with GBC since last year.I purchased a set of 27X12-12 Dirt DevilII from MotoXMall over the internet, because of their prices.When they arrived,3 of the tires were matches,but the 4th tire was taller and narrower than the others.Tried to contact MotoXmall via email with no response,finally called them and they said I would have to contact the Company.Contacted GBC ATV division and was jerked around since October 2008.Finally got enough and bit the bullet and ordered another tire from GBC.com.Here are the pics of the mismatched tires.although the Dirt Devil tires have a good look the company that builds them is lacking.
Here is the new tire
Here is the mismatch
The width comparison
The difference in height,the mismatch measures +29.5
All I can say is buyer be aware