Wheel Recall ( Snowflake ) - The Definitive Truth

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Wobbly
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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by Wobbly » Mon Oct 23, 2017 6:23 pm

So how good is your dental insurance ?
They still break occasionally
After 20 years as a professional bike mechanic and 30 years as an engineer I know just enough to be dangerous !

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ME 109
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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by ME 109 » Tue Oct 24, 2017 6:20 am

That wheel cracked but didn't break into two pieces. The wheel was cut into two pieces to reveal information about why it cracked. I'd like to see a clear close up of the cracks.
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Kurt in S.A.
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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by Kurt in S.A. » Tue Oct 24, 2017 6:54 am

From the poor picture, I think I can see beachhead marks on the hub spoke at the 6:00 position. That would make sense as the crack could have started on one of the flat surfaces and as the hub tries to rotate relative to the outside rim, the crack would progress through the spoke. The spokes are less likely to bend out of plane due to the cross sectional stiffness. That's why they added the webbing where they did.

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SteveD
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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by SteveD » Tue Oct 24, 2017 7:24 pm

That picture is on my photobucket page. Photobucket are extortionists and accessing the pictures is now very difficult. From memory there was another picture with that one. I'll need to go search and see what I can find.
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Kurt in S.A.
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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by Kurt in S.A. » Tue Oct 24, 2017 8:21 pm

Older thread here on the forum...some good pictures of the failure.

viewtopic.php?t=9840

Ha! It's on page 1 of this very thread!! :lol:

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ME 109
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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by ME 109 » Wed Oct 25, 2017 6:24 am

I still can't tell from the pics and it doesn't matter because a precise report of the failure would be out there somewhere so I can only guess.
Was it a single event that took out four spokes? Just fatigue cracks that were not through? What do the intact spokes look like at the same point? What does the cracked surface tell about the failure's origins and progression?

And it still doensn't matter 'cause I got reinforcement!
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Gibson
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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by Gibson » Wed Oct 25, 2017 11:44 am

Wow, they look great in gold!!

Wobbly
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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by Wobbly » Fri Oct 27, 2017 10:38 pm

A better title for this thread might be...
"Snowflake and the 7 Dwarfs" :roll:
After 20 years as a professional bike mechanic and 30 years as an engineer I know just enough to be dangerous !

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Re: Wheel Recall ( Snowflake ) - The Definitive Truth

Post by The Veg » Sun Nov 05, 2017 9:38 am

:mrgreen: :mrgreen: :mrgreen:
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