Here is 1st hand info .. 26" wheel 39:16 [2.4375:1], and 53:16 [3.3125:1], 20" wheel,
feel similar 63.375, vs 66.25 .. tooth here or there

little wheel, rotating more often, does wear chain and cog, replaced, a bit sooner..

but I havent quantified, wear comes from use,the 20" wheel Bi Fri is getting most use, now..