White saddle, 53/39 crank and corresponding bottom bracket. The crankset gives me one more tooth on the big ring and is a little bit lighter. It also has 175 cranks instead of the stock 170's. I I may have to drop the saddle a corresponding amount to keep the fit the same. For anybody who changes out the BB on this bike, remember to loosen the screw that mounts the cable guides underneath it- the screw jams right into the BB shell and makes it hard to remove.