List etiquette would indicate a change in the subject line to match the subject...
Chuck Schmidt SoPas, SoCal
Jan Heine wrote:
> From personal experience, the stresses on the drivetrain while
> touring far exceed the stresses while racing. Recently, we went for a
> weekend trip, and my Mercian was loaded with camping gear for three,
> a trailer and a 30-lb. 2-year-old. The Mercian has horizontal
> dropouts and Campy C-Record hubs. (I had replaced the broken axle
> prior to the trip.)
> Several times when starting from a light, the rear wheel pulled out
> of the dropouts. I tightened the QR as much as reasonable, but to no
> avail. I finally "learned" to start using a very light touch, and
> that helped.
> In all my years of racing (up to a Cat. 2), using Campy NR hubs and
> horizontal dropouts, I never had a wheel pull out during a sprint
> (fortunately, I might add - I might not be around to tell the tale).
> Why? I don't know, but I suspect the reason is simple: When Cipollini
> pushes on the cranks, the bike has the option of going forward to
> alleviate the stress. A loaded touring bike puts up much more
> resistance... and thus stresses the entire drivetrain much more.
> But we are getting away from classic bikes here.
> Jan Heine, Seattle
> >From: Tom Dalton <email@example.com>
> >Subject: Re: [CR]Predicting/preventing NR/SR crank breakage
> >To: firstname.lastname@example.org
> >Jerry & Liz Moos wrote:
> >I suspect that laboring up a mountain pass with 50 lbs of gear
> >stresses a crank as much as a Cippolini sprint.
> >Sure, and the crankshaft in my Chevy Nova gets just as much stress
> >as the crank in Michael Schumacher's Ferrari... Ugh!