john
Oh good grief. A couple stand up warm sprints the day before, or even
before the ride would have detected this. If it doesn't than it's really
not dangerous.. A bump or two may have caused the handlebars to turn, but
it certainly wouldn't have been a "Hincapie..."
Torque specs on stems is somewhat laughable... Unless you actually think
or know the diameters are precisely controlled to say plus or minus 5 thou,
and you know the stiffness, etc, of that being clamped, and of the stem,
etc...
YMMV, but I am just going to trust my hand, eye and feel over blind torque
numbers. They can be a guide, but certainly are not giving you a
direct desired pre-load or clamp force. They'll get you in to an order of
magnitude at least ! : )
Also anything plastic (sorry the resin in the carbon falls into this
category) is going to creep under load. (meaning preload / clamp force
will dissappear over time..)
On Sat, Mar 3, 2012 at 6:28 PM, wrote:
> So let me get this straight. You only check your bike once a year. You are
> very lucky that you haven't hurt yourself or others.
>
> Scott
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: "Dan H"
> Sender: obra-bounces@list.obra.org
> Date: Sat, 3 Mar 2012 18:26:19
> To: OBRA list
> Subject: [OBRA Chat] check your bikes!
>
> I'm doing my first event of the season tomorrow so I washed and checked my
> bike.
> To my amazement, I found the Thomson X2 stem bolts has loosened to point
> that the bars swiveled on the steer tube very easily. It was torqued to
> spec
> (5.5nm) last year. I checked again and the steer tube bolts were several
> turns loose as though they had been rattling loose for some time. I checked
> the face plate bolts and found they were also loose.
> The loose condition could have easily caused me to crash possible taking
> some of my fellow racers with me. Injuries could have been anywhere from
> bruises to death.
> Please check over your bikes, your pedals and your cleats and lets finish
> wheels down.
> Sorry If I sound like a nanny, but that kind of freaked me out.
> Thanks, Dan
>
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