Thread: Cycling equivalents to running 10km, half, and full marathon.
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Old 04-05-22, 04:09 PM
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burnthesheep
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Originally Posted by RChung
Was that guy saing 3:1 ratio in time or in distance?

Elsewhere I've argued that in terms of distance the multiplier is likely somewhere in the range of 2.5:1 to 3.5:1. That is, if you were handicapping a runner/cyclist race, how long should the cycling race be so that the times are roughly equivalent?
Distance.

Issue is that 25w faster over two 5k runs per the runner power pace calculator is more time saved than 25w more over the 30k bike leg in a duathlon.

So:
300w run and 325w bike is slower in a 5k/30k/5k than a 325w run and 300w bike.

I made a little Excel sheet to prove it out.

Basically if you can run 5min miles you can really suck at the bike and win but the bike cannot use mammoth watts to makup the same time. Because the faster a cyclist goes the more power it takes and the less time they gain.

Pace power calc here: Couzens
https://alancouzens.com/blog/Run_Power.html
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