Originally Posted by
TMonk
Yeah the accordion effect can get pretty rough near the back.
And there is often a big difference (wattage wise) between doing a 45-60min race at that speed and a multi hour solo ride at 20.
And since you don't know the guy, and since you don't ride with the guy, would it be fair to say that you really don't know whether he's capable of riding for several hours (on an unspecified bike, in unspecified terrain) at 20mph?