Martin318is said:
.........We sat on about 85kph on the way back. by the end my arms hurt worse than my legs.
.
I have never held on to cars at high speed, but at usual racing speeds it seems so natural that I don't have to think about it and consequently never analyzed what I do.
Anyway, here Benoit Poelvoorde teaches you what NOT TO DO :
http://www.youtube.com/watch?v=tnkEAgO_QHk
IIRC he broke his collarbone and the movie was delayed.
On the question of your arm hurting I have an anecdote.
In 1993 I was doing my 8th Marmotte, expecting to finish at my usual time. Unfortunately it was a bad day for me and I was already more than 15' behind when I reached the bottom of Alpe d'huez and I had invited a whole bunch of family at Les 2 Alpes for later in the day.
Since I didn't want for them to be waiting for me, I decided upon reaching Huez, 5km from the finish, to rip off my frame "plate" and "hitch a ride". A guy accepted to drag me up to the top. So, I was hanging on to his car window as he was trying to pass cyclists between the rows of spectators who were booing me very loudly, until mercifully we reached the split, about 3.5 km from the top and took the alternate road.
Going up at maybe 50 km/h or less, the effort from hanging on to that car window with just my right hand was incredible, at the limit of what I could withstand. Technically it seemed very easy, but physically I was at my limit.
I did save lots of time though and eventually reached Les 2 Alpes before the majority of my guests.
Much later I discovered the reason for my bad performance : I had seen the previous month a cardiologist who had found - or so he thought -
high effort blood pressure, and recommended that I do not exceed 150 bpm. He also had prescribed a medicine which i took dutifully.
The following month I learned that the high blood pressure was just an artefact due to the testing procedure.
Years later I realized that the medicine the Dr had given me was a
beta adrenergic blocking agent (bêtabloquant)! not exactly a PED
