Join Date: Jun 2010
Location: Cochrane, ON CANADA
Bikes: Raleigh Olympian, Trek 2100, Cannondale F1000SL, Dahon Speed TR
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm not sure what 'L' is, but as mentioned you can use the d or r in case you need to calculate the circumference which is calculated as C = 2 x pi x r or C = pi x d, where pi is a constant number of 3.14159...
Or, if you need to measure out the circumference manually, put a chalk mark on your wheel, get on the bike and align the chalk mark (at the bottom of the rotation) with a line on the ground then roll your bike as you are on it to a point where the chalk mark is again at the bottom of the rotation. Measure the distance between the two marks on the road and that will give you the ground distance for a full wheel's rotation. Really, one way or another that is what your computer needs, so you can calculate the r or d from that manual measurement.
I hope I haven't confused you?!