Join Date: Aug 2005
Location: Rocket City, No'ala
Bikes: 2014 Trek Domane 5.2, 1985 Pinarello Trevisio, 1991 Colnago Master, '06 Bianchi San Jose, 1987 Moulton Fuso, 1990 Gardin Shred, '82 John Howard(Dave Tesch)
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The dualdrive system is very reliable; you select your low-medium-high range for the hub, then shift through the cassette for smaller gear changes. If you've rolled to a stop in high, you can shift to medium or low range while sitting still.
If you wanted to change it, you'd have to get a new rear hub and have the wheel rebuilt. You'd have a 7-spd bike then.
Internal gear hubs have been around a long time and are quite nice mechanically. The Bianchi Milano uses the Nexus 8-spd hub and shifts very smoothly.
Don't just look at the Bergamo; take it on a test ride. Take two test rides, long ones. Shift through all the gear combinations. Go up hills, go down hills. Bring your hiking/camping gear and strap it on the rack; then ride it.