spin class conversion to mph?

[bcipam]

I usually get to class at least 1/2 hour ahead of time to start my warmup. My favorite instructor expects this as he jumps right into the routine when the class starts. No warmup in his class. It's sortof an advance class and newbies beware!

And I do make judgments about mileage. Last night we did alot of climbing drills so I have to judge that my mileage was probably more in the 8 - 10 mph range v. 20. ie more like mountain biking than road riding.

The classes I attend are all run by cyclists so we don't do alot of those fancy spin class drills. Personally I wouldn't do them anyway. If I am in a class that's doing alot of drills, I just sit myself down and do a sustained, fast paced spin, trying to stay in a fat-burning or fitness zone on my HRM.

Again there is no set rule to counting mileage. Everyone has to make this judgment themselves. Experienced road/mtb riders know just how far they have gone.

PS: What do you mean off the bike - do you literally mean off or standing up on the bike? My classes are generally 60 minutes of riding. Warm up is before and cool down is after. No time off the bike but there can be alot of standing (like last night; of the 60 minutes we rode, we stood 45 - it was a tough class).