roomba wheels?

[blackbeard]

so i dug up these

http://www.robotshop.ca/roomba-drive-wheel-assembly-pair-27.html

they're a set of roomba wheels (used apparently) and having used them before from a dead roomba descovery SE i've found them to be pretty powerful. they even have their own encoders inside which is a nice touch. the mounting system however is a bit funky and maybe even flimsy so it would need a bit of work to be very functional. has anyone used these in their projects and knows how to mount them properly?