[Brian Bauer]

there can be a time and place for riding a bike in training. Jim Walmsley and Hillary Allen have both shown how bike riding can contribute to success. I can’t answer the math problem about converting volume to a run-equivalent, but here are 2 articles talking about when/why Jim and Hillary wer3e doing bike workouts:

Jim Walmsley opens up about injury ahead of Western States 100

https://hillaryallen.com/can-an-ultra-runner-do-ultra-riding/

and don’t forget uphill ski touring. Some of the best Sky runners in the world dedicate the entire winter to Skimo racing!