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Stronglight Pulsion...bit of a structural failure!

Posted: Sat Jun 03, 2006 5:21 pm
by snips
On the way to race this afternoon, put the power down away from some traffic lights and BOOM...bits of chainset all over the road.
Everything torqued up properly and no damage. One tab breaking would be bad but for three to go...I'm speechless (and also lost a Tune chainring bolt whilst trying to get chainring on in a state where I could hobble home...rats).

Stronglight Pulsion...bit of a structural failure!

Posted: Sat Jun 03, 2006 5:21 pm
by Weenie

Posted: Sat Jun 03, 2006 5:32 pm
by col hicks
that sucks it makes me not want to ride mine

Posted: Sat Jun 03, 2006 7:06 pm
by Ramjm_2000
Wow! :shock: Makes me glad I went with the Vulcans. Let us know how/if stronglight takes care of the problem.

Posted: Sat Jun 03, 2006 7:08 pm
by Rich_W
lovely... those new record cranks can't come out fast enough...

were you getting any funky creaking before they failed?

Posted: Sat Jun 03, 2006 7:09 pm
by drjones96
Haven't we seen this same sort of failure before?

Posted: Sat Jun 03, 2006 7:25 pm
by flying
Is it possible the Tune chainring bolts allow some play? Or are they the exact same size at the pulsion bolts?
Sorry you had a problem but glad you were not hurt.

Posted: Sat Jun 03, 2006 7:36 pm
by strobbekoen
drjones96 wrote:Haven't we seen this same sort of failure before?


Indeed, i am sure i saw it before too, not sure where though

Posted: Sat Jun 03, 2006 7:37 pm
by ergott
Hope you're ok.

Check the right chainstay to. It looks like there is a gouge in it.

-Eric

Posted: Sun Jun 04, 2006 2:58 pm
by snips
Tune bolts were an exact fit and, as said, torqued properly.
Had no indication that it was going to break either, ie creaking or movement, it just literally exploded! I was fine...was a bit of a hassle limping back home though.
I imagine one tab failed then the others failed as the chainring twisted and moved. Its going in the post to France tomorrow...

Oh and the marks on the chainstay is in thick protective plastic which I've stuck there... it's the old mountainbiker in me that causes old habits to die hard :)

Posted: Sun Jun 04, 2006 3:20 pm
by strobbekoen
check out this old topic
http://weightweenies.starbike.com/forum/viewtopic.php?t=10033&highlight=pulsion+broken

apparently, the guy broke it while pushing down the power at a traffic light........... :shock:

Posted: Sun Jun 04, 2006 3:20 pm
by Weenie

Posted: Tue Jun 06, 2006 11:44 pm
by jeremyb
my pulsions are thin around that area as well. Should I send them to Stronglight? I didnt buy them new.

Maybe I should beef up the area with a little extra carbon and some epoxy?

j