[greencactus3]

oh by the way if you're gonna put down power on these wheels youd prolly want sum hard foams inside. these rubbers may be grippy but that means flexible and tearable. with a couple lego motors and much gearing and much weight and much rough concrete ground was easily enough to rip up these. trust me. they arent designed for much force. unless you're planning on using them as freewheeling omnis. ex) as a replacement for casters. then you prolly wanna have lotsa support under these. oh and lego plastic wheels would not work lol. lego tends to be very brittle when it could be a bit stronger. well if you want durablitiy i suppose knex is flexible enough to stand a bit more