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5 comments
http://cyclingtips.com.au/2010/04/biggest-bang-for-your-buck-in-time-tri...
Suggests they are better than an aero frame or a rear disc if you can do 48 minutes over 40 kms...
Tyres roll faster on wet roads also, less friction.
I have read a research paper which suggests they are slower (it was the Lycra type overshoes), however it's small on the rubber style.
I have read conflicting opinions and seen estimates of 7 seconds in a '10' but I doubt one figure is representative.
Smoothing the airflow over the shoe is a good thing but increasing the area exposed to the wind will cause more drag. One suggestion I've read is to gaffa tape over sharp edges, another to wear superthin socks/tights and buy the smallest pair your feet can fit in. Neither sounds ideal to me.
I recommend you do whatever you are happiest with. Your mind is possibly the biggest influence on performance in training or a time trial.
There's an old myth that there is "more oxygen in the air" during or after rain but that doesn't mean the human body can actually benefit from it. However, the drop in pressure after a rainstorm and warm, humid air will help you ride faster.
s'probably the weather.
Though I have heard that you TT faster in the rain.