Today I had to train inside at my gym. We had some cold rain come through. I got on a spin bike for 3.5 hours pretty much non-stop. I tried to use tension to simulate hills, and I did them at different time intervals. I am guesstimating I traveled about 60 miles. My cycling time for 3 hours = 50 miles. Since I did it inside, non-stop, I added 10 miles.
Is this a fair guesstimate? Am I wasting my time doing the spin bike to replace real training? I want to go back tomorrow for one last "long ride". I then want to just do 10 miles on Friday (get my bike fine tuned). Then do my century on Saturday.
I should add i hate that spin bike. It is nothing like being outside! There is nothing like the fit of my bike! All the fun training days in the open have been great! 70 miles on my road bike kills 10 miles on a spin bike, any day!