Having trouble

#1 That's because you have mesh that is not triangulated select "all" then triangulate
make sure your mesh is not parented to any node when you triangulate
for collision just make a box around the tire model make sure it fits the shape select it
hit "W" key for move tool then "insert" key so you can move the pivot in the side/top view ports
hold "x" and snap the pivot to 0.0.0 "center" this way the tire will roll right
call the box col_1 and make a copy of the details node and call it collision_1
should look like this in Hypergraph make sure you freeze transforms of the tire+col_1
then add your bounds and your ready to export.

#2 Thanks for the help and now i understand how to do collisions but it's still coming up with that same error...
i did follow all you steps...

#3 Nevermind i got it to work... i had to triangulate the pichy bounding box

#4 If you have the dts utility just select the mesh then click "create bounding box" it will triangulate and make the bounding box plus orient it with "Z" up if your model in mayas default "Y" up just remember to center the pivot
or the tire will roll funny

#5 Thx ya i did all that and it all worked (when i made the bounding box in dtsUtility i had to triangulate that)

im making a game (or world, mmo, simulation im not sure yet)
but similar to waterworld (almost no land) and ya...