I keep a rather detailed ride log, and I have recently noticed a slight slowing in terms of average mph. (Based on a moving average of last 10 rides). I ride almost exclusively the same route – but obviously there are weather variables.
One slight change I made in bike setup was a new carbon bar – but the difference in reach is nominal. Can wearing of tires make a speed difference? I’m not speaking of wearing down to threads, but both my front and rears (GP4000’s) have developed a small flattening of the riding surface. The only other thing I can think of is the chain, which has about 3000 miles on it – but less than 1/8 inch stretch at the 12” mark.
The bike is kept in showroom condition, along with regular chain and drive train maintenance
My endurance, etc. has improved – so why the slowdown?
PS – Discuss overall body weight distribution in speed terms. Can getting too much weight off the saddle and on the bars have a negative effect?