Not really sure what kind of calculation you’re looking for in height to weight ratio. But to optimize efficiency on a bike, which I assume is your goal, we all know correct fit is key. Beyond that, maybe focus on how your power is transferred to where the rubber meets the dirt. You may have already gone down this road, but maybe invest in a crank power meter (or whatever they’re called). Combine what it tells you with heart rate find your XC riding sweet spot. Then you may be able to improve lap times by making changes to the drive line. Some riders are better at high cadence and low power, others low cadence/high power. Find the right crank length (how your power is leveraged) and front ring combo (how applied power is transferred to the cassette) for wherever you fall in that cadence/power ratio. Then match up a cassette that covers the range of gearing you need for the terrain you expect to frequent. Good grief. I’m rambling on like I know what I’m talking about. Best suggestion may be to ignore me. 🙂
Some interesting comments. Thanks Fred. I hope others “chime in” on this thread. Coming from a running background with skinny legs, I’ve always definitely been a higher cadence rider. I find power moves very taxing, especially early in the season or if I am out of shape. I’m guessing power moves are more taxing on higher cadence riders than more powerful riders.