I have been noticing a slight decrease in performance over the past week or so and am wondering if there is something mechanical to blame rather than me going soft.
The facts I have are built up with the data my garmin collects... It seems that over the same ride on various days my average speeds are decreasing, while my heart rate is remaining the same. I was thinking at first the difference could be to changes in wind patters slightly, but I've ruled that out as I have completed the same 18 mile loop over different days, with similar weather conditions (generally calm, no rain)
I noticed that my normal rolling speeds went from roughly 16.5-18 depending on the road are now 14.4-16 mph, and hills have been noticeably harder to climb.
In terms of training I ride between 100 -230 miles a week, none commuting. When I ride it's usually as fast as I can go. I have approx 3k miles in this year and have been seeing slight improvements each week/ month of training, so to go backwards at this point in the season is especially frustrating.
I ride shimano rs20 wheels. The front recently broke a spoke and has been on back order, so I'm using a Xero lite wheel for the front off my old bike. Upon first switching this wheel I noticed an improvement in speeds, not decrease, which was odd. The back wheel has also become slightly untrue. It dosnt seem to be to the point that breakes are rubbing but when you spin the wheel you can see a SLIGHT wabble. Would this effect speeds leading to ,my problem?
I also have not taken my bike in for a tune since I bought it last July, or approx 4k miles later.
If anyone could give me advice, I'd greatly appreciate it as I'm NO mechanic.