TRF 5mm O-Ring Set, gear differential spare

The TRF 5 mm O-Ring red set is a drivetrain spare for oil-filled sealed gear differentials, built to support a cleaner seal inside compatible assemblies. Its key difference is the slightly smaller inner diameter compared with the standard black kit O-ring, creating a tighter fit where differential oil needs to stay contained during use. This pack contains 8 red O-rings and is intended for many sealed gear differential units across the Tamiya range. The data specifically names the TA-05 option sealed gear set, plus the included differential sets used in TA-06, XV-01 and TRF417 series cars. That makes the set useful both as a direct replacement during maintenance and as a practical stock part for workshop drawers, pit boxes or ongoing chassis service. In oil-filled differentials, small sealing parts have a direct effect on how consistently the unit holds fluid, so the ring size matters. During rebuilds or routine servicing, these O-rings slot into the differential assembly as functional sealing components rather than cosmetic extras. They suit racers and builders who keep multiple compatible chassis in rotation and want the correct red 5 mm rings ready when a differential is opened for inspection or refresh work.