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1992 front tire size

I wouldn't change the front tire size. The 1st Gen C10 has a narrower rim than the later ones. A 120/70 has less profile height than the 110/80 which will add to your speedometer inaccuracy. There are a good number of 110/80 front tires out there to choose from so you'll be just fine staying with the same size.
 
Thanks for the info. I believe staying with the orig size is best and so did the motorcycle suppliers. However, my Harley buddies said to hang a bigger tire on there. However, I did have problems getting the exact Dunlop replacement. Pirelli Sport Demon is the only 110/80 -18 that was quoted. Except for Metzler everything else was a 100/90 - 18; i.e., Dunlop D404, Michelin Commander Crusier. I ended up with Metzeler ME 880 Marathon. The front was a 110/90 -18 ($237 for the F & R no shipping $ at Motorcycle superstore) Again thanks for the help.
 
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