mike 109444
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Just remember that the diameter of your gears will determine the size that your roller will need to be. If you go for 2" (50mm) gears then you may find off the shelf rollers easier to get unless you can turn up your own.For a foot pedal, how about one from an old Singer sewing machine?
I collected a Vedette BMC engine from Chepstow over the weekend and it has an epicyclic gearbox (think that is what it is called) with a bunch of circa 1.5 inch dia gears in it that look ideal apart from the smallish bore to them. I only use 1.2 or 1.5mm 1050 ali so shouldn't need to be too beefy.