I ran across these and thought I might share look up robot kits then treads
superdroidrobots dot com( sorry wouldn’t let me post the link you have to type it then look up robot kits/treads)
superdroidrobots.com/shop/it … 7&catid=55
superdroidrobots.com/shop/it … 2&catid=55
Thy are very nice tracks but kind of pricey considering you have to add your own lugs inside and make your own sprockets. I did order some 4" ones and they are nice quality though.
so… you what, glue something to the inside to make lugs? 
These look like a pretty poor substitute for the Lynxmotion track kit. Almost $200 for a pair of treads, and then you need to do a whole pile of work on them to make them useful?
From what I’ve seen. the Lynxmotion tracks (with an appropriate chassis) can easily support 100 lb robots. I have a set, and the quality and fit is impressive…
- Jon
Those track don’t even come close to the lynxmotion tracks.
The 4" tracks would be useful on a larger bot but the 2" is way overpriced. And you would use flathead screws to attach lugs inside.