(09-11-2009, 02:10 PM)smokey125 Wrote: Interesting question Marco. There have been several discussions over the years about length but I’ve never seen anybody highlight the point you have. As a thought is it possible that there has been a typing error somewhere along the publishing route that the figures you used might have in them?
Does anybody know if there is a way of checking the original times?

AAARRRRGGGHHHH:-). You're right and I apologize for the error. The official average speed for 2007 Senior TT lap 1 is 129.883 mph and not 129.833 mph as I had written. So this problem has been solved. But there is the other one:
the length value is variable through the years: I have evidence of this (not based on wrong data!).

Also, there are other editions in which the lenght value seems to be variable through the race laps. But first I want to control the data.