Wind Tunnel tested: How much difference do aero wheels make?
Briefly

The 2015 Trek Emonda ALR bike was found to be slower by 23.06 watts at 40km/h compared to the average of the superbikes, illustrating its aerodynamic inefficiencies.
The comparison with the new aero wheels showed significant potential to improve performance; however, there are varying opinions on whether such upgrades are cost-effective for entry-level bikes.
Read at cyclingnews.com
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