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Old 06-23-20, 07:02 AM
  #15  
burnthesheep
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Originally Posted by Clipped_in
There would be more aero benefits by putting a deep section rim on the back instead of the front.
Categorically false.

The front sees undisturbed airflow. AKA, the "clean" air. After the front of the bike and your moving legs, the rear of the bike sees turbulent airflow or "dirty" air. And no matter the bike, even a tube framed non-aero bike's seat tube slightly shields the leading edge of the rear wheel. The part of the rear wheel seeing clean airflow is likely only the bottom bracket height off the ground.

It's been the budget go-to since the beginning of time for people to buy a nice aero front wheel for their time trial bike while still running something basic or original on the rear of the bike. Then, folks on tight budgets often for race day only will mount their $100 rear disc wheel "cover" over their box section rear wheel. Then off the bike and in storage till next race day.

You see rear discs with small profile 30mm front wheels because of windy race conditions, not because it is the fastest all-out setup. Kind of like on calm days you'd run a front 90mm, less calm 60mm, really bad 30 or 45mm or so. Except for a gale, I'd run the rear disc pretty much all the time as it isn't on the steering axis and has more of your weight balance on it.

Lots to learn before making that assumption and posting it as factual knowledge.

Last edited by burnthesheep; 06-23-20 at 07:09 AM.
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