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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A set of durable aluminum spacers in five sizes — 12mm, 6.7mm, 6mm, 3mm and 1.5mm — for general use around a Mini 4WD chassis: setting roller stand-off, adjusting rear stay position, fine-tuning brake height, or shimming any other part where a precise gap is needed. The five sizes cover coarse adjustments with the 12mm and 6.7mm pieces down to fine shimming with the 1.5mm piece, which is thin enough to fine-tune a brake sponge's ride height. Tamiya lists the set as compatible with essentially every Mini 4WD chassis it has produced, from the original Type 3, Type 4, Type 5 and Zero Chassis through FM, FM-A, Super-1, Super-II, Super FM, Super TZ, Super X, Super XX, Super TZ-X, VS, MS, AR, MA, VZ and ME Chassis, since spacers are a generic fastening component rather than a chassis-specific part. Being metal rather than resin, they hold their thickness under repeated tightening instead of compressing over time.
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.
Choose a Tamiya Mini 4WD gear set by the exact chassis, motor layout and instructions. Check ratio, gear cover and event rules before changing the drivetrain.