Joined: Jul 2002
Posts: 40,863
Likes: 3,116
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
You can use any time keeping device and math. For example, count how many times your right knee comes up in 15 seconds and multiply by 4. (I'm not very good at math so I count how many times in 60 seconds and then multiply by 1.)