Superteam Carbon Fiber Road Bike Wheelset 700C Clincher - 50mm Deep 23mm Wide Matte Finish | Lightweight & Aerodynamic for Racing & Endurance Cycling

I have a 2010 Trek 2.3. I had upgraded it over the years but it was looking 'old' with the 23c tires, natural aluminum colored rims, and the bundle of cables hanging off the front of the handlebars.I bought these to do one thing only, update the look of my bike. It definitely did that. They look absolutely fantastic and are worth every penny even before I talk about performance.I started with upgraded Mavic Aksium rims with cheap 23c training tires, which are a cheap update but were very lightweight and functioned very well. I bought these rims and added cheap 28c training tires. I did the same 36 miles route 2 days in a row, one with the old rims and one with the new. I also tried to control my heart rate so I wouldn't subconsciously 'try harder' one day over the next. Very unscientific and subjective results but long story short I finished the route with the new rims 8 minutes faster of the 36 miles.The results indicated I was able to ride faster with less effort. I actually think this is due to what you would not expect. Between the two wheelsets, I think the old wheels with smaller tires and purposely lightweight tubes are lighter than my new wheel/tire/tube combo. I felt like I was descending faster and once I got up to speed, I could carry that speed longer up the next hill before having to change gears.Maybe my theory is bad, but the wheels made a positive difference after one longer ride.One tip, when I switched over to the new rims, I took the 10 speed cassette off the old wheels and use it on the new. When I moved it I did not move over the spacer that allows the 10 speed cassette to be used on the 11 speed freehub. That was a mistake. The spacer between the two wheelsets were not the same size causing the new chain to make a strange noise when pedaling. I could have adjusted the rear derailleur to fix this, but I choose to just switch over the spacer from the old wheel to the new wheel and that fixed it. Just FYI.UPDATE:Please take the time to read some of the 1-star reviews and understand the limitations of this wheelset. Your safety very much depends on it. I live in the rolling hills (not mountains) of the Midwest. These wheels work wonderfully here with no issues at all. I still intend to put many many miles on them. If you ride in the mountains, or intend to do so with this wheelset, DO NOT BUY THESE RIMS. Long, mountainous descents with brakes applied can cause the bead to overheat and bulge or even shatter.