Sounds suspiscious, but it is possible that the machines they use require a certain amount of sidewall. Mounting can be a PITA if you don't have it done by the same place that sold the tires, found that out the hard way with my motorcycle. $150 total for two tires, $70 to have them mounted. :| Thankfully, I've since found a better cycle shop to deal with. If anyone is in Northwest Ohio, never deal with BG Motorcycle, they'll screw you over eight ways from Sunday.
ZV