When you converted over to the schrader tubes did you upgrade to a bigger tire or do the big store off the shelf Bell tubes fit the stock wheel/tire?

I see them advertised as "Fits most 20" x 1.75" - 2.25" BMX and mountain bike tires"
I know the stocks are 1.5"

I'd like to make this change on my nanos just for the ease for finding the tubes, if they fit of course.