AJA #32: Marginal Gains for Commuters, Big Riders & Motorcycle Chains


  • Mike W.

    This past season I upgraded my road bike tire setup to Continental GP 5000’s 700×28c tires with TPU inner tubes on an internal rim width of 12.5mm and an external rim width of 19.0mm. I am on the bigger side of road cyclists (6’4” @223lbs.). This tire, tube and rim setup produces an audible rubber squeaking sound (like rubber shoes squeaking on the floor) while rolling on smooth to rough asphalt. Is this dissipating energy in the form of sound vibration costing me watts? If so, what are possible solutions to this? Wider rims? Different inner tubes? Optimize tire pressure? Lubricate inner tubes?
    Thank you.
    Love the show!
    Mike W. Buffalo NY

  • rick

    two tire Rolling resistance questions: Is there a penalty for running a tubeless tire(because they’re faster) with a latex tube(my roval rapide wheels are not tubeless compatible)? ive heard they run about the same CRR as 20ml of sealant. 2) do you have a rough CRR for the difference in say 26mm to 28mm tire when accounting for vibration loss, or is it purely a measured width issue? my rapide wheels running a 26mm measures 28, versus my 28 which measures 30. i know aerodynamically the “loss” in wider is outweighed by the smoother ride of 28 vs 26. i guess im asking, am i losing too much by riding a 28 that measures 30 vs a 26 that measures 28. or am i just ultra deep into the “it depends” world lol

  • Hal Stuart

    Hi Marginal Gains Podcast,

    After having listened to all the episodes of this podcast there seems to be a common theme that CRR is maybe the hardest thing to measure on the bicycle. Would it be possible to go into detail about what sensors could be developed to measure this or what has been tried historically? Something that measures the flex of the tire? or maybe reconstructing CRR from various sensors that measure strain or vibration in the wheel?


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