Some "extended" thoughts from the question - Since there is no rule that explictily prohabit what LEGO wheels should be, it's okay for 1 - Don't use tires 2 - Use wheels / tires in OTHER LEGO sets. 3 - Use non-conventional "wheels" - how about use gears with or without motorcycle chains? How about use "claws" with NXT motors? - the robot can move with that kind of "wheels", right? 4 - Keep in mind that FLLers build the robots not cars. Robots mimic human's behaviors. When a man need to go somewhere "on foot" he usually walk. But what a man will do if he must go up a steep slop or climb up a cliff? Jin --- On Tue, 10/6/09, vanamala nagendra <[log in to unmask]> wrote: From: vanamala nagendra <[log in to unmask]> Subject: [VADCFLL-L] A question about the robot... To: [log in to unmask] Date: Tuesday, October 6, 2009, 11:48 AM Hi, Is it okay if lego wheels on the robot donot have rubber tires? ---Thanks, Vanamala Arkalgud To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". VADCFLL administrative announcements are sent via VADCFLL-ADMIN-L. Visit https://listserv.jmu.edu/archives/vadcfll-admin-l.html to subscribe. -- To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". -- VADCFLL administrative announcements are sent via VADCFLL-ADMIN-L. Visit https://listserv.jmu.edu/archives/vadcfll-admin-l.html to subscribe.