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if you learned to pedal you'd find 50/12 more than adequate as a top gear
100rpm = 52.kph
Most people are happiest spinning around this. They're not happy holding above 120 for much. Fat people and lonely testers can just get tucked or whatever but won't someone please think of the skinny roadies holding wheels or breaking away?
Why compromise yourself when things get really quick (when you need it the most)?
miro_o
It might not work at all, front road-double dérailleur cages tend to be fairly tightly sized to accommodate a 16T difference, so the chain could rub on the top or bottom of the cage in either the big/big or small/small gear.
Of course, if you learned to pedal you'd find 50/12 more than adequate as a top gear, rendering the question moot.