Collecting broken cranks?

Robin Hubert said:

I have a Ritchey Logic 110/74 square taper left and right
crank that are cracking.

[snip]

Could you describe where the cracks are occurring?

Thanks,

James Thomson

"James Thomson" <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

Robin Hubert said:

I have a Ritchey Logic 110/74 square taper left and right
crank that are cracking.

[snip]

Could you describe where the cracks are occurring?

Hi James,
Cracks are radiating out of the corners of the tapers, on the
inside. L crank has two cracks 180 degrees opposed and in line with
the crank axis. R crank has one identifiable crack eminating 90
degrees from the crank axis.

Robin Hubert

Robin Hubert said:

Cracks are radiating out of the corners of the tapers, on the
inside. L crank has two cracks 180 degrees opposed and
in line with the crank axis. R crank has one identifiable crack
eminating 90 degrees from the crank axis.

Thanks - I'll keep an eye on mine.

Perhaps the failure-collector you were thinking of is:

http://pardo.net/pardo/bike/pic/fail/000.html

James Thomson

Robin Hubert said:

Cracks are radiating out of the corners of the tapers, on the
inside. L crank has two cracks 180 degrees opposed and in line with
the crank axis. R crank has one identifiable crack eminating 90
degrees from the crank axis.

Do you check the tightness of the crank bolts regularly? If you give
them an extra tweak every time you do this, the crank eventually breaks
in the fashion described.