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**jocko** · 11-08-2015, 02:27 PM

C20s and K20s could all be had with 16.5, it was stock for both. 16s were an option for a long time. Then 16s became stock at some point, don't know year, but I believe it was after 75. 15s were standard on C/K10 only - never on 3/4 ton trucks. 15s had 5 (71 and up C10) or 6 lug pattern (all K5/10).

11-08-2015, 02:27 PM	#6
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 18,001	Re: Original tires? C20s and K20s could all be had with 16.5, it was stock for both. 16s were an option for a long time. Then 16s became stock at some point, don't know year, but I believe it was after 75. 15s were standard on C/K10 only - never on 3/4 ton trucks. 15s had 5 (71 and up C10) or 6 lug pattern (all K5/10).