So the orange / red Ultegra build does come with Whisky carbon rims. Our shop just built one up in 55cm and it was 21 lbs 01 oz without pedals. It has a fairly hefty aluminum seatpost, the seat is not light, and the aluminum bars aren't the lightest, either. This bike could easily get to 20 pounds, IMO. The purple 105 build comes with alloy wheels but we haven't had one in our shop to weigh yet. Just giving some real world information. I ride a 2016 Salsa Colossal with Ultegra drivetrain, BB7 brakes, and 32mm Bontrager AW3 tires. The 105 Zig Zag is very comparable, but has front and rear thru axles, way more tire clearance (can fit 32s with fenders, whereas my Colossal is almost rubbing the fork with 32s), a threaded bottom bracket, and flat mount 105 hydraulic disc brakes. If I didn't already have the Colossal I would definitely be getting the 105 Zig Zag.
Last edited by Darth_Firebolt; 09-22-19 at 10:20 AM.