Yes ******, you should use bigger tyres to avoid any inteference with the track;
regarding the second question, I have made a number of spacers to even the left/right wheel-track, slicing nylon tubings of appropriate diameter; I have found that some of the tubing used to cover the receiver's antenna on R/C cars is quite good to make these spacers, and it's easily obtainable; or you could find some outer tubings used in R/C planes to make the elevator/rudder controls (they are named bowden ). I use it also among the chassis and the gear on sidewinders (a very thin slice here!) to reduce friction.
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Ciao
regarding the second question, I have made a number of spacers to even the left/right wheel-track, slicing nylon tubings of appropriate diameter; I have found that some of the tubing used to cover the receiver's antenna on R/C cars is quite good to make these spacers, and it's easily obtainable; or you could find some outer tubings used in R/C planes to make the elevator/rudder controls (they are named bowden ). I use it also among the chassis and the gear on sidewinders (a very thin slice here!) to reduce friction.
Ciao
