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






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.

3000 kilometers is old for a crankset?

Hope that was a typo.

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Thing 1 & Thing 2 & Thing 3

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

at least it was patented

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dangerous curves ahead

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

Glad you came off relatively unscathed!

Let me know if you want mine

Glad you're ok

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Bikes: Raceur, Beateur

Obviously user error. Someone pushed too hard on the pedal.

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dangerous curves ahead

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 ...

It happens to Dura Ace too!

I'm totally not having cranks on my next bike

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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Trek Warranty Rep.

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!