Pop went the crankset!

Discuss light weight issues concerning road bikes & parts.
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Leviathan
Posts: 1029
Joined: Sat Mar 17, 2007 10:49 am
Location: Mallorca, Spain
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by Leviathan

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
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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.

RussellS
Posts: 691
Joined: Wed Feb 03, 2010 1:31 am

by RussellS

3000 kilometers is old for a crankset?

by Weenie


bricky21
Posts: 1405
Joined: Tue Sep 14, 2010 3:28 pm

by bricky21

:unbelievable: Hope that was a typo.

cmh
Posts: 449
Joined: Wed Oct 11, 2006 12:07 am
Location: San Francisco, CA

by cmh

:shock:

justkeepedaling
Posts: 1340
Joined: Thu Jan 03, 2008 6:14 am
Location: by Crystal Springs (Sawyer Creek Trail)

by justkeepedaling

3000 km, jeez. There better be another 0 added to the back of that number

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bikerjulio
Posts: 1901
Joined: Fri Dec 11, 2009 10:38 pm
Location: Welland, Ontario

by bikerjulio

at least it was patented :shock:
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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MattSoutherden
Posts: 1378
Joined: Fri Jul 10, 2009 7:22 pm
Location: London

by MattSoutherden

Next time I think of buying something other than a DA crank, I must remember to look at this...
Snacking on carrot sticks - Where did it all go so wrong?
-
Finsbury Park CC

Mackers
Posts: 480
Joined: Wed Sep 05, 2007 2:02 pm

by Mackers

:shock:

Glad you came off relatively unscathed!

HillRPete
Posts: 2292
Joined: Tue Apr 12, 2011 8:08 am
Location: Pedal Square

by HillRPete

Let me know if you want mine :evil:

Glad you're ok

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bikerjulio
Posts: 1901
Joined: Fri Dec 11, 2009 10:38 pm
Location: Welland, Ontario

by bikerjulio

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

TimmS
Posts: 356
Joined: Mon Mar 28, 2011 6:46 pm
Location: Amsterdam

by TimmS

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 ...

spandexboy817
Posts: 192
Joined: Fri Apr 18, 2008 12:55 am

by spandexboy817

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

CamW
Posts: 206
Joined: Mon Jan 17, 2011 10:26 pm
Location: New Zealand

by CamW

I'm totally not having cranks on my next bike :evil:

Fisherfreerider
Posts: 145
Joined: Thu Sep 29, 2011 1:19 am

by Fisherfreerider

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.

redoaker
Posts: 84
Joined: Sat Jun 27, 2009 10:20 pm

by redoaker

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!

by Weenie


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