A recently received Edmund's scientific catalog has a bunch of robotics oriented stuff, including a geared, tracked vehicle platform: http://www.edmundscientific.com/Products/DisplayProduct.cfm?productid=1081 Only one motor, looks pretty small, no steering. But looks like a nice gearbox, and cheap (even compared to RS toys.) BillW -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body