[SS Tim]

Sorry Guys,
The 10.00-16.6/C (6PR) On-Off Road tires coded RR2 were offered only with the 8.25" wheels in '72. There were also the R79 highway tires as well for K10, K20. C20 and C30s. Didn't check but they were also available on Blazers as I recall. The reason you have it listed three times with three different codes were as Fronts, Rears and Spare. These replaced the default tires. On a K series they had to match. On a C series you could see these just on the rear with smaller fronts or a similar matching size Highway tread, The R79s. The spare could be ordered to match either axle or even as a bare wheel in some cases.