Double Aluminum Rollers 15398: What 13–12 mm Means
Understand the stepped 13 and 12 mm roller contact, included bearings and mounting checks for Tamiya item 15398. Use the item-specific checklist.
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This FRP (fiber-reinforced plastic) stay mounts at the rear of the chassis and provides several hole positions for fitting 9mm, 13mm, or 19mm rollers in wide settings, letting a builder widen the rear roller stance for cornering stability. Additional holes on the plate accept mass dampers and brake parts, so the same stay can carry both rollers and braking or damping hardware at the back of the machine.
Unlike the front-mounting FRP Multi Roller Setting Stay, this rear version's listed compatibility is narrower, spanning FM-A through the current ME chassis, since it has to match the rear body-mount pattern of that specific run of chassis rather than the near-universal front mounting point. That narrower fitment is effectively the trade-off for gaining the extra mass-damper and brake holes the front stay doesn't have.
Understand the stepped 13 and 12 mm roller contact, included bearings and mounting checks for Tamiya item 15398. Use the item-specific checklist.
Tamiya 15456 and 15516 bundle five gear ratios, 3.5:1 to 5:1, but fit different chassis. Compare contents, price and fit before buying the wrong set.
A Mini 4WD setting board records roller height, brake height and width so a setup is repeatable. What to measure, the 90 g box, and why HG boards stay off-car.