Gear Ratios?

meagain
meagain Posts: 2,331
edited May 2008 in Workshop
I'm trying to figure out gearing on Bromptons and can't seem to equate their "Ratios (metric)" to either of the "Gain/Development" methods on Sheldon's calculator. I need in particular to compare the 4.45m-5.93m stated for the 2 speeder with x" under trad method.

In passing, anyone know standard front ring size on Bromptons - catalogue doesn't seem to give it. Actually I suppose with that info I could calculate the "s figures!

Thanks.
d.j.
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