Go to www.cardomain.com and go check out the page with people's h3's on there.There are quite a few on there with 24's and 22's.Talked to the hummer dealer in Memphis and they said they have no fitment problem with either 22's or 24's but would reccomend to get 22's cause you would go with a 305/45/22 size tire with quite a bit of meat on it for a sreet tire but if you go with the 24's you will have to go with a 305/35/24 tire and it's not very big at all and would be a rough ride.Hope this helps.