I used my Huffy 3sp as an off road bike in the early 1970s with 26" x 1-3/8" tires. I found a tricross style tire for the front and a block tread for the rear. I had the stock 48/19T gearing then. Later I found that I could modify the inner lugs of the narrow gears from a 5 speed cluster to fit on the Strumey-Archer hub. With 25 and 28T gears on the hub, and 36 /40T crank gears to make a derailleur system, you would have some decent off road ratios. The coaster brake would have to be replaced by rim brakes.
The paint looks great!
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