Tamiya HG 19mm Aluminum Ball-Race Rollers (Ringless) Asia Challenge (Green Logos)(95688)

A 19mm aluminum ball-race guide roller from Tamiya's High Grade (HG) roller line, built in the "ringless" style — the aluminum roller body itself forms the running surface, without the separate plastic sleeve or ring used on some ball-race rollers. This particular release is a limited version tied to Tamiya's Asia Challenge Mini 4WD tournament series, distinguished from the standard retail roller by its green-printed Tamiya logo.

At 19mm, this sits among the larger-diameter rollers in Tamiya's HG range — bigger than the widely used 13mm and 17mm sizes — which racers favour on faster courses because a larger roller contacts a course fence over a gentler curve and holds a steadier line than a small-diameter roller bouncing along the same fence. Being a ball-race design rather than a plain bushing, it rolls with noticeably less drag than the plastic rollers in most Tamiya kits, which is why aluminum ball-race rollers are among the most common first upgrades a racer makes. The green logo print is purely cosmetic and doesn't change the roller's dimensions or bearing spec versus the standard-graphics version.

• Diameter: 19mm
• Material: aluminum, ball-race (bearing) construction, ringless design
• Green logo print — Asia Challenge tournament edition
• Use: guide/stabilizer roller for Mini 4WD chassis