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 Post subject: Pop went the crankset!
PostPosted: Wed Feb 29, 2012 9:06 pm 
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Joined: Sat Mar 17, 2007 10:49 am
Posts: 780
Location: Mallorca, Spain
I ripped apart my KCNC RD1 crankset at the pedal entry point today. (Now I know what that creaking was!)Luckily Im a slow climber so only a few cuts & bruises. Oldish (3000kms crankset but nevertheless)
A couple of admittedly poor quality photos here
Image
Image
Image
Image
Image

What Id like to know is:
1) Doesnt KCNCs (patented method) of drilling out the crank to reduce weight, and then plugging the end of the hole with a threaded bung, which sits orthagonal to the pedal hole, create a stress riser? Has anyone seen this failure before?
2) More importantly, I was considering a ROTOR 3D crankset as replacement, but dont they use the same system?
Fanks.


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PostPosted: Wed Feb 29, 2012 9:42 pm 
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Joined: Wed Feb 03, 2010 1:31 am
Posts: 314
3000 kilometers is old for a crankset?


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Posted: Wed Feb 29, 2012 9:42 pm 


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PostPosted: Wed Feb 29, 2012 9:46 pm 
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Joined: Tue Sep 14, 2010 3:28 pm
Posts: 1402
:unbelievable: Hope that was a typo.


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PostPosted: Wed Feb 29, 2012 9:51 pm 
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Joined: Wed Oct 11, 2006 12:07 am
Posts: 444
Location: San Francisco, CA
:shock:

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Thing 1 & Thing 2 & Thing 3


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PostPosted: Wed Feb 29, 2012 10:19 pm 
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Joined: Thu Jan 03, 2008 6:14 am
Posts: 1135
Location: by Crystal Springs (Sawyer Creek Trail)
3000 km, jeez. There better be another 0 added to the back of that number


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PostPosted: Wed Feb 29, 2012 10:52 pm 
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Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1045
Location: Toronto
at least it was patented :shock:

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There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


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PostPosted: Wed Feb 29, 2012 11:22 pm 
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Joined: Fri Jul 10, 2009 7:22 pm
Posts: 862
Location: London
Next time I think of buying something other than a DA crank, I must remember to look at this...

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Snacking on carrot sticks - Where did it all go so wrong?
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Finsbury Park CC


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PostPosted: Wed Feb 29, 2012 11:34 pm 
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Joined: Wed Sep 05, 2007 2:02 pm
Posts: 323
:shock:

Glad you came off relatively unscathed!


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PostPosted: Wed Feb 29, 2012 11:48 pm 
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Formerly known as wassertreter

Joined: Tue Apr 12, 2011 8:08 am
Posts: 1842
Location: Pedal Square
Let me know if you want mine :evil:

Glad you're ok

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Bikes: Raw Ti, 650b flatbar CX


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PostPosted: Wed Feb 29, 2012 11:51 pm 
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Joined: Fri Dec 11, 2009 10:38 pm
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Location: Toronto
Obviously user error. Someone pushed too hard on the pedal. :P

_________________
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


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PostPosted: Thu Mar 01, 2012 12:13 am 
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Joined: Mon Mar 28, 2011 6:46 pm
Posts: 262
Location: Amsterdam
Can't withstand a laugh on he patented inscription.
An patent on a crash?

Sorry, I really liked those cranks before a saw this failure and I hope you aren't damaged.
Get some Rotors instead ...


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PostPosted: Thu Mar 01, 2012 1:02 am 
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Joined: Fri Apr 18, 2008 12:55 am
Posts: 134
MattSoutherden wrote:
Next time I think of buying something other than a DA crank, I must remember to look at this...



It happens to Dura Ace too!


Attachments:
crank.JPG
crank.JPG [ 38.59 KiB | Viewed 3414 times ]
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PostPosted: Thu Mar 01, 2012 1:27 am 
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Joined: Mon Jan 17, 2011 10:26 pm
Posts: 140
Location: New Zealand
I'm totally not having cranks on my next bike :evil:


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PostPosted: Thu Mar 01, 2012 2:36 am 
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Joined: Thu Sep 29, 2011 1:19 am
Posts: 90
I have seen cranks from just about everybody do that. Call KCNC, they will probably help you out. They hooked up a customer of mine whose spider cracked plus gave him a gift card to cover his race entry fee.


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Posted: Thu Mar 01, 2012 2:36 am 


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PostPosted: Thu Mar 01, 2012 7:47 am 
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Joined: Sat Jun 27, 2009 10:20 pm
Posts: 84
Yes, Rotor uses the same drill and plug method.

Good to see there wasn't any leg or foot meat hanging on the stub of that crank arm!


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