The Duo has a similar style and spec of the Solo, but has been upgraded with a 20.8” frame, 28/10 gearing, 8” bars and sealed bearing hubs. Full Chromoly Frame w/20.8” TT. Full Chromoly Fork and 8” Bars. 36h Alloy Sealed Bearing wheelset w/Alienation Rims and Rear Cassette Hub including 1pc Driver. 28/10 gearing. Premium 120psi Tires. Micro Adjust Seatpost. WEIGHT = about 28 lbs.