Ask Josh Anything #008

We’re back with more proof that we’re willing to ask Josh practically anything bike-related…and that he’s willing to take practically any question seriously. In Ask Josh Anything #008, we talk about what gas you should fill your tires with, the challenge of planning for endurance ride air pressure loss, marginal gains and Kipchoge’s sub-2-hr marathon, which pedals are most aero and whether aero pedals matter (they do!), whether aero adjustments could make a difference in downhill MTB races (they could!) and —as always — much more.

Got a question you’d like to ask? Text or leave a voicemail at the Marginal Gains Hotline: +1-317-343-4506 or just leave a comment in this post!

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2 thoughts on “Ask Josh Anything #008

  1. “Back in the day” we used to use liquid latex to fill the gap between tubular tyres and the rim (which then set) is there anything in that? Did it cost more Crr than the aero gain? Also on the topic of aero tyres, there was a period with quite a few – zipp tangente, bontrager aerowing and R4 aero. Any thoughts on why they went away, will aero tyres come around again?

  2. This might be my new favourite podcast. Awesome!

    2 questions and a comment.

    Comment
    1) I have read in a few places that the high heat absorption of dark colours also means dark colours let go of heat faster and as a result, the wind convention effect at around 22kph or higher means dark colours are cooler than light colours at that speed (or faster).

    Questions
    1) Aero over weight.
    Using best bike split, this looks very clear. But when you add in the extra element of riding in a 50 rider size bunch on the flat…..are the aero gains of an more aero, but heavier wheelset or frame mitigated to the point where weight starts to matter more when you have a main climb in the race or course? Assuming you never take a turn on the front of the peloton. Does this explain why marquee climbers still stick with light bikes over aero bikes in the pro tour?

    2) If you have aero data on a wheel, tested in a tunnel, presumably on it’s own or as the front wheel, what is the general consensus of the type of aero performance reduction would you expect for the back wheel (behind a frame, churning legs and crank etc)? All companies would post aero data of a front wheel hitting the clean air, so you wouldn’t just double that for 2 wheels, or would you? Or does it vary so wildly that there’s not a typical range?

    Thanks for the shows! Love them.

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