John the Monkey said:.
Take front wheel off, roll it for two complete revolutions (mark start, 1 rev, 2 revs) and then measure the distance marked and divide by two. I never trust those tables in the manual (spot on for my contis, but out for my Stelvios by a few mm)
If you are trying to get exact then you need to be on the bike when you roll it as your weight will flatten the tyre by a good few mm (If it did not you would have almost no contact with the road) Shorten radius by say 3mm (x pi) will make you about 1cm out on your calculation.
AdamBlade said:Mine is from Ecclesall Road South down to Meadowhall. Great in a morning, mainly downhill. Average about 12mph on way home and 8-10mph up Ecclesall Road from hunters bar upwards.
bonj said:bet banner cross to hunters bar is bloody frustrating in the morning...
AdamBlade said:It's not to bad with the bus lane. Corner of Encliffe Park can be a bit of a nightmare. This is where I came off a couple of weeks ago. Cars always pulling across traffic without checking bus lane
postman said:Don't worry about speed.We i am 58,average about 14mph.But we enjoy tea and dinner stops.But we are retired and have all day when we go out.
Abitrary said:Actually, in a seven and a half hour day, with 2 twenty minute tea breaks and an hour lunch break, you're probably averaging closer to 20mph!!