Pufftmw wrote:Its to do with maths Dunc
The distance to be travelled is just under .25 miles (the segment) and at the time taken to do the segment is 24 seconds. Ergo...( & keeping the numbers even), the time taken to do 1 mile is 96 seconds (multiply by 4), which implies that the speed is 60/(96/60) = 37.5mph. Distance/time taken = average.
Use the same methodology for the couple of people at 27 seconds and it works out as 33.3 mph (obv the distance is a bit under .25 hence the extra .3 of a sec)
The reason is that at a higher speed, you will cover a greater distance every second, so although I only hit 37 for 4 or 5 seconds, I travelled a lot further to someone that started the segment at a higher pace but maintained a steady pace throughout.
That's not right. For a start unless you know the exact length of the segment (I'm sure it isn't 0.25 or 0.2 miles exactly) you can't calculate speed accurately this way. If the length you're using is too short the speed will end up being too high.
More importantly, you can't rely on Strava to work this out for you, it is terrible
at dealing with this type of short, high-speed segment! I don't know what the hell they're doing to come up with some of their times but on many occasions I've been given average speeds 3-5mph faster than what I know was my real top
speed on similar segments. The speed graph from your attempt here clearly shows there was no way you could have averaged over 37mph since you were only at that speed for 2-3 seconds.
Try this: click and drag from one end of the graph to the other, the same way as if you were selecting a part of a longer ride. Strava will report the average speed again, but this method apparently uses a different method of calculating the result and the average speed now comes out as 34.5mph (assuming that's accurate and keeping 24s time, then the segment must be around 0.23 miles long, which seems reasonable enough).
From looking at the other results you would still have beaten everyone else even at 34.5mph though! Perhaps your ride was flagged because someone else noticed the 37.5mph average wasn't accurate, I wouldn't be surprised...