How do you know your speed?

[Sardine]

I can't help re speed since I generally don't pay attention to that. I use Map My Ride to calculate distance. You can use it to work out how long a route is by entering your starting location then tracing the route to the end point. It will tell you how far it is and also give you information on gradient: http://www.mapmyride.com/routes/create/

[lxb87]

You ladies are all wonderful! Thanks so much for all that info.

I'm definitely going to get a computer when I get my bike. It reminds me of buying a heart rate monitor for going to the gym ... not necessary, but helpful and fun and motivating!

Now I want to plug in some routes to that online map to figure out how long to go next weekend on the rental bike.

[sempronialou]

I use an app on my iphone called GPS lite. I'm not sure how accurate it is, but that's what I use because it gives me my mileage and speeds for set intervals.