Cat 660 Scraper

666 tire size's Don, That is an amazing model, all it needs is sound & smoke! I believe the correct sizes to be 18:25 steering, 37.5x39 drive axle & 37.5x51 on the scraper axle. Caterpillar did have various tires options including dual tires on the drive axle & they may have put 37.5x39 on the scraper axle. The larger tires on the scraper axle were for long haul-high speed work. In these photos we apear to see both s

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