Shimano Octalink BB

I received my torque wrench in the post yesterday.
I must admit I was surprised at how much I had to tighten the crank bolts
by.
So much so that the chain was throwing off the large chainring and wouldn't
shift onto the small one.
Front mech adjustment this evening I think.

KC

On Fri, 5 Sep 2003 11:23:33 +0100, "Getronic Engineer"
wrote:

I received my torque wrench in the post yesterday.
I must admit I was surprised at how much I had to tighten the crank bolts
by.
So much so that the chain was throwing off the large chainring and wouldn't
shift onto the small one.
Front mech adjustment this evening I think.

KC


You may be interested in the article posted on InsideTriathlon.com by
Lennard Zinn and a response by Mathew Basaraba, a Customer Service
Manager who has been calibrating and repairing torque wrenches for a
number of years.

One of the main points that Basaraba makes is:

"Turn the handle to a torque lower than what you think the bolt is
tightened to. Try loosening the bolt. If the torque wrench's head
clicks over before the bolt budges, up the torque setting a bit.
Repeat until the head clicks over just as the bolt turns. Now you know
the torque the bolt was tightened to."

Zinn states:

"....I have seen often is that torque settings provided by
manufacturers in the bicycle industry are not always the ideal
recommended torque for proper performance. Sometimes the torque listed
in the manual is actually the maximum allowable torque for the bolt,
and tightening to this torque actually constitutes over-tightening for
the clamp involved. Tightening bolts repeatedly to this setting (for
instance, in the case of stem front-clamp bolts that are frequently
removed for traveling) will result in breaking or stripping the bolt."


And further adds, "Due to this, I have begun to question even listing
torques in the torque table in my books."

Much more of interest in the whole article at:

http://www.insidetri.com/train/bike/...es/1710.0.html


I have no axe to grind, nor at the moment, a wrench to torque....I'm
just the messenger.

Joe

What is the recommended torque for the Ultegra Octalink?


--
SlowPokey
Climb like an overloaded Winnebego on a bad tank of gas...
Descend like a "Bat Outta Hell!!!...


"Getronic Engineer" wrote in message
...
I received my torque wrench in the post yesterday.
I must admit I was surprised at how much I had to tighten the crank bolts
by.
So much so that the chain was throwing off the large chainring and
wouldn't
shift onto the small one.
Front mech adjustment this evening I think.

KC

Something like 50nm. It's on shimano's site, just need to google it. You
will not get it tight enough without a torque wrench, or something that
gives leverage. Trust me on this one, had a crank arm come loose on me.
I don't know the lower limit, the upper on the ocatalink is 50 though,
which is roughly 37 ft lbs. Again, google it to be sure.

Mark


SlowPokey wrote:

What is the recommended torque for the Ultegra Octalink?




"Getronic Engineer" wrote in message
...
I received my torque wrench in the post yesterday.
I must admit I was surprised at how much I had to tighten the crank bolts
by.
So much so that the chain was throwing off the large chainring and
wouldn't
shift onto the small one.
Front mech adjustment this evening I think.


--
Mark Wolfe http://www.wolfenet.org
gpg fingerprint = 42B6 EFEB 5414 AA18 01B7 64AC EF46 F7E6 82F6 8C71
Never trust an operating system you don't have sources for. ;-)

I've seen a number of torque wrenches sold on by online retailers, which have a
scale like device to indicate the actual force used.

Are these devices accurate? I've been used to torque wrenches by Snap-On and
MAC where the force is set and the wrench clicks when it has achieve that
force.

Claude

I prefer the clicker type myself.


Chluu907 wrote:

I've seen a number of torque wrenches sold on by online retailers, which
have a
scale like device to indicate the actual force used.

Are these devices accurate? I've been used to torque wrenches by Snap-On
and
MAC where the force is set and the wrench clicks when it has achieve that
force.

Claude

--
Mark Wolfe http://www.wolfenet.org
gpg fingerprint = 42B6 EFEB 5414 AA18 01B7 64AC EF46 F7E6 82F6 8C71
"Even if you're on the right track, you'll get run over if you just sit
there."
- Will Rogers

Chluu907 wrote:

I've seen a number of torque wrenches sold on by online retailers, which have a
scale like device to indicate the actual force used.

Are these devices accurate? I've been used to torque wrenches by Snap-On and
MAC where the force is set and the wrench clicks when it has achieve that
force.


A good beam torque wrench is more accuate then a clicker type, but more
difficult to use. I use a beam type to make sure that my clicker's are
accurate .

David