Why Are XC Pros Doing This?

Deep-section gravel wheels on an XC mountain bike… crazy idea or actual speed hack? After seeing some pro riders experimenting with aero setups at the World Cup, James decided to get a custom set and see what the fuss is all about for himself. He puts them head-to-head against standard shallow XC wheels on a fast short-track loop and a high-speed flat test to see if aero really matters on the trails.

⏱ Timestamps ⏱
00:00 - Introduction
00:50 - The World Cup Aero Wheel Trend
01:54 - Comparing Wheel Specs & Weights
03:31 - Hub Spacing & Fitment
04:09 - Rim Depth vs. Tyre Profile
04:46 - Aerodynamics & Airflow Explained
06:49 - Weight Savings & Rotational Mass
08:46 - Comfort & Compliance Factors
12:05 - Test 1
16:53 - Test 2
19:11 - Data Analysis & Final Verdict

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