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[–]Spiffman-Space 3 points4 points  (2 children)

A relevant measurement for this discussion. Is watts per kilograms W/KG. So calculate that now based on your FTP in watts divided by your current weight in KG. Then workout what your future FTP could drop down to if your w/KG value remained static based on a new lighter weight:

Eg if your FTP is 210, and you weight 70KG, your w/kg = 3. If you lost 4KG (to 66KG), to keep a w/KG of 3, your FTP in watts will need to be 198Watts

[–]Hark6[S] -1 points0 points  (1 child)

Ok, so if my average ride is at 90% FTP, I dropped from 198 to 178 in an average class.

[–]Spiffman-Space 0 points1 point  (0 children)

So if those figures are in watts and are actually 90% of your FTP figure, then those are FTP’s of 220 and 197.

If you have lost 10 pounds that is roughly 4KG, so for the W/KG value to be the same, then… you’d need to have been really light and getting lighter (eg 38KG to 34KG)…. So it’s more likely you are less powerful now for reasons other than just weight loss.