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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An FRP (fiber-reinforced plastic) stay designed to mount 9mm, 13mm, or 19mm ball-bearing rollers in wide positions on a Mini 4WD chassis. Its rigid construction resists flex under cornering loads, while the multiple mounting holes let builders combine different roller sizes, heights, and widths to fine-tune handling.
The stay can be fitted to either the front or rear of the car, and the small attachment parts needed are included.
Tamiya's own parts catalog lists fitment across nineteen chassis in total, from Type 3 through the current ME chassis, making this one of the broadest-fitting roller stays in the Grade-Up Parts range. Type 1 and Type 2 chassis are notably absent from that list, so older machines on those chassis are better served by a different stay.
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.