Burkey tells me that these are "transport wheels" bolted on to make it easier to get the tank to where it's going to muster, then the wheels are removed
http://anyskin.tumblr.com/post/148941503112/sdkfz254-with-t-26-turret#notes
http://anyskin.tumblr.com/post/146375452972/1930s-spain-bt-5#notes
http://anyskin.tumblr.com/image/165055242747
