Ask Josh Anything #003

Q&A Episode 3 –

We didn’t necessarily intend for it to turn out this way, but this episode of Marginal Gains’ “Ask Josh Anything” is a wheels, rims, tubes, and tires question extravaganza. We also find time to discuss the SILCA Hiro chuck’s origin story, whether testing how aero helmets are in a lab setting has real value, and exactly how much impact on your ride those gatorskins are having.

Got a question you’d like to ask Josh? 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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3 thoughts on “Ask Josh Anything #003

  1. Hi guys. Love the show. I have a question for Josh about ceramic bearings. I’m very curious – not about how fast they are compared to steel bearings – but rather how they are made and what they are made of. I can’t see the similarity between ceramic bearings and ceramic plates, cups, tiles, sinks and toilets. Do ceramic bearings have any relationship to other “ceramic” items, or none at all? If so, how are they so strong when everything else made of ceramic is incredibly easy to shatter? I realise that’s a few questions rolled into one but I would love it if Josh could explain this to me and other listeners. Keep up the great work.
    All the best from Santiago, Chile!

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

    2 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.

  3. Hi Guy’s
    Love the podcast.

    I have a question regarding rim depth I do Time Trials in what is called a Merckx/Road class. You’re not allowed to have aero parts you ride a straight up, road bike. This year they changed the rule for wheels from 32mm to 38mm deep rims. Currently, I am using Shimano Dura Ace C24 21mm front and 24mm in the rear. So I know we’re talking marginal gains but how much performance gains could one except say going to a rim in the 35mm to 38mm range. I know you can save big time in a 40k TT with deep rims, I am only doing 16k TT’s and it’s all flat. Rims are not cheap so would I be better spending my money on fast tires, latex tubs, skin suit (they will let you use them), an aero road helmet. I never had deep rims I know with the 40mm + you can hold speeds over 25mph easier but with the shallow depth, rims they must top out at some point.

    Thanks again for the work you put into the podcast


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