1997 Specialized Hardrock Sport FS - steel Mountain bike - 26"x1.95" knobbies - 1 century
2013 Trek 8.4 DS - aluminum hybrid - 29" x 38cm knobbies - 1 century
2011 Fuji Newest 1.0 - aluminum road bike - 700c 25cm road tires - uh.... not sure... 10-20 centuries
2016 Waterford RS-22 - steel randounneuring bike - 650b 38cm smooth, soft, and plush tires - only a few "centuries" - I normally go way farther. (15-20 brevets of 200k, 300k, 400k, 600k)

Yes... all 4 bikes have different tire standards. (They all have different shifters as well - twist shift, trigger shift, brifters, bar end shifters)