Pop went the crankset!

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Leviathan
Posts: 1282
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: 916
Joined: Wed Feb 03, 2010 1:31 am

by RussellS

3000 kilometers is old for a crankset?

by Weenie


Visit starbike.com Online Retailer for HighEnd cycling components
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bricky21
Posts: 1403
Joined: Tue Sep 14, 2010 3:28 pm

by bricky21

:unbelievable: Hope that was a typo.

cmh
Posts: 447
Joined: Wed Oct 11, 2006 12:07 am
Location: San Francisco, CA

by cmh

:shock:

justkeepedaling
Posts: 1712
Joined: Thu Jan 03, 2008 6:14 am

by justkeepedaling

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

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bikerjulio
Posts: 1900
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: 1376
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: 482
Joined: Wed Sep 05, 2007 2:02 pm

by Mackers

:shock:

Glad you came off relatively unscathed!

HillRPete
Posts: 2284
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: 1900
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: 424
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: 172
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: 301
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: 269
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: 79
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


Visit starbike.com Online Retailer for HighEnd cycling components
Great Prices ✓    Broad Selection ✓    Worldwide Delivery ✓

www.starbike.com



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