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:

pardo.net000.htmlOpen ↗

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.