You won't know unless you try it, so just try it. Wear cycling shorts and wicking t-shirt; a jersey isn't necessary. Cycling shoes with SPD cleats. I really enjoy spin classes, and it took me a long time to try it out. Too bad; I missed out on some good years of spinning.

I found that it really improved my outdoor riding when the weather improved. I was stronger than I had ever been at the beginning of the season.