My 6Fattie's wheels don't fit in the grooves of my Thule bike rack. The wheel rests on top of the "wheel holder" (don't know what to call it) so isn't flush as can been seen here. I can rest it on the "wheel holder" but that's not safe and I've cracked one already. These racks were made in a time when there weren't that many plus size wheeled bikes around. I have one of these side view any suggestions of what to do or what anyone with a similar problem has done to so sort it out?