Old 04-28-12, 08:38 AM
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Join Date: Sep 2011
Location: Ventura County, CA
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Bikes: 2012 Cervelo S5 Rival and 2012 Speed Concept 9.9 Di2

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I used to do a 20 mile (round-trip) commute on it, when I changed offices to one that was 35-40 miles round trip, i upgraded to a road bike. The Brompton is wonderful, but it is much more exhausting to ride than a light road bike....if you want to go fast, be prepared to get really sore, if you want to maintain a steady heart rate and level of effort, be prepared to go really slow.

If you are concerned about efficiency, the kind that lets you do long distances everyday at a good speed, I'd say go for a road bike.
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