Congrats on your Firsts, Lisa! (Well, not the flat, but still, now you know how to deal with it.) Going fast is FUN! Almost makes up for the slow drudge up the hills.

I turn my bikes upside down to change tires always. I've done it forever. Never had any resulting damage. I've seen people do it both ways. Whatever is easier for you.

Darcy, I think it depends on how each computer works. Mine turns itself off automatically after a couple of minutes so it doesn't factor much of the off-bike time into average speed. I just need to remember to start it up again when I get back on the bike. I'm not always so good at that.

Annie