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#1
July 28th 15, 07:26 AM
posted to rec.bicycles.tech
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Shimano XT FC-M739 Cracks
Following a discussion on another forum, I thought I'd post pictures of some interesting cracks in a Shimano XT M739 crank.
http://www.retrobike.co.uk/forum/dow....php?id=324929 http://www.retrobike.co.uk/forum/dow....php?id=324928 The cranks are from the late nineties, square taper, and use a separate spider. Any thoughts? James Thomson 
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#2
July 28th 15, 03:40 PM
posted to rec.bicycles.tech
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Shimano XT FC-M739 Cracks
On 7/28/2015 2:26 AM, James Thomson wrote:
Following a discussion on another forum, I thought I'd post pictures of some interesting cracks in a Shimano XT M739 crank. http://www.retrobike.co.uk/forum/dow....php?id=324929 http://www.retrobike.co.uk/forum/dow....php?id=324928 The cranks are from the late nineties, square taper, and use a separate spider. Any thoughts? James Thomson I wonder if those were present from the day it was born - IOW, that the metal flow was incomplete when the part was forged. The cracks don't seem to originate at stress risers. And the voids in the first photo seem hard to explain any other way. -- - Frank Krygowski
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#3
July 28th 15, 10:36 PM
posted to rec.bicycles.tech
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Shimano XT FC-M739 Cracks
On 29/07/15 00:40, Frank Krygowski wrote:
On 7/28/2015 2:26 AM, James Thomson wrote: Following a discussion on another forum, I thought I'd post pictures of some interesting cracks in a Shimano XT M739 crank. http://www.retrobike.co.uk/forum/dow....php?id=324929 http://www.retrobike.co.uk/forum/dow....php?id=324928 The cranks are from the late nineties, square taper, and use a separate spider. Any thoughts? James Thomson I wonder if those were present from the day it was born - IOW, that the metal flow was incomplete when the part was forged. The cracks don't seem to originate at stress risers. And the voids in the first photo seem hard to explain any other way. My thoughts too. -- JS
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