For trail or track use, the Tamiya 42259 5mm Gear Differential O-Rings are a practical component to keep oil inside the diff. These red O-rings are made for oil-filled sealed gear differentials and are compatible with platforms such as the TA-05, TA-06, XV-01 and TRF417. Their slightly smaller inner diameter compared with common black rings creates a firmer seal that reduces oil leaks and helps the differential last longer between services.
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