Mini 4WD Roller Setup Basics

Roller setup is geometry: where the rollers sit relative to the track wall and to each other decides how the car behaves through every corner.

Height

Rollers must contact the wall within its usable band. Too high and the car can climb; too low and the roller can slip underneath. This is the single most common cause of cars leaving the track.

Width and stagger

The distance between left and right rollers sets how much the car can move within the lane. Staggering front and rear widths slightly changes how the car turns into a corner and how it settles afterwards.

Front and rear roles

The front rollers set the line into a corner; the rear rollers stop the tail stepping out. Problems entering a corner are front geometry; problems mid-corner are usually rear.

Find a baseline and keep it

Record your working heights and widths. Roller setup drifts as parts are removed and refitted, and a written baseline is what lets you get back to a car that worked.