***IMPORTANT PLEASE READ (but don't panic)***

cliffa

cliffa

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Folks, one of the Facebook 961 owners spotted this whilst cleaning the front wheel on his 2010 bike...


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He mentioned the bike has not been wheelied, curbed or in an accident, so I took a look at my 2011, and the first spoke socket I looked at has what looks like a hairline crack in the same position. I need to get the wheel out, remove the discs and look closer at all of them. This obviously is a potentially lethal fault. Please check yours.


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Please post on any other forums you think would be suitable.
 
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Is that a crack I can see on the Facebook pic on the next spoke head housing forward from the one that cracked.

If this was a known issue you would expect a later hub to have had more meat added to the hub so a pic of a later bikes hub for comparison would be useful.
 
kommando said:
Is that a crack I can see on the Facebook pic on the next spoke head housing forward from the one that cracked.

If this was a known issue you would expect a later hub to have had more meat added to the hub so a pic of a later bikes hub for comparison would be useful.
Click to expand...
Yes, it looks like cracks on two others kommando, plus at least one more failed on the other side. Hopefully it was beefed up later as these are two early bikes.
 
Wow. Had this same design of spoke/hub straight through connection on a pedal bike with "high end" shimano hub. It also failed but at the spoke not the casting. Never seen that with traditional designs. Gotta wonder why this type is used.
 
Looks to me that that hub design is designed for the spokes to pull straight.

In that plain they’d be pulling on very thick alloy.

But they’re not pulling straight, they’re bent and therefore leveraging on the thin part of the alloy. No wonder they broke…
 
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Fast Eddie said:
Looks to me that that hub design is designed for the spokes to pull straight.

In that plain they’d be pulling on very think alloy.

But they’re not pulling straight, they’re bent and therefore leveraging on the thin part of the alloy. No wonder they broke…
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My thoughts exactly.
 
The Talon-style hub seems to have been designed for a smaller bike with thinner spokes. NMC then increased the spoke dimension without increasing the anchors. Yes, the spoke's directional change causes a transverse load trying to pry off the vary thin head of the anchor.
Scary design!

- Knut
 
mdt-son said:
The Talon-style hub seems to have been designed for a smaller bike with thinner spokes. NMC then increased the spoke dimension without increasing the anchors. Yes, the spoke's directional change causes a transverse load trying to pry off the vary thin head of the anchor.
Scary design!

- Knut
Click to expand...
Yes scary indeed. My guess is there is no fix once it's broken?
 
This is a very worrying development, thanks Cliff for bringing it to our attention. There doesn't appear to be enough metal around the holes.

I've checked my bike this evening I cannot see any problems yet but I will look again tomorrow in the daylight..

My bike is a 2018, it's difficult to tell but I think mine appears to have more metal around the spoke holes, what do you think?

***IMPORTANT PLEASE READ (but don't panic)***


***IMPORTANT PLEASE READ (but don't panic)***
 
Are these hubs from a supplier or custom in-house design? Could pursue with a supplier if named.
 
Gazz said:
This is a very worrying development, thanks Cliff for bringing it to our attention. There doesn't appear to be enough metal around the holes.

I've checked my bike this evening I cannot see any problems yet but I will look again tomorrow in the daylight..

My bike is a 2018, it's difficult to tell but I think mine appears to have more metal around the spoke holes, what do you think?

***IMPORTANT PLEASE READ (but don't panic)***


***IMPORTANT PLEASE READ (but don't panic)***
Click to expand...
Thanks for posting Gazz. They certainly look like there is more material around the spokes. Not overly generous though are they? I may be wrong, but it also looks like they are straight spokes?
 
According to the supplier info. sheet the later ones were made by Honho Precision Industry Corp.
 
Might this issue relate more to the overtightening of spokes during manufacture or maintenance, rather than a design flaw? Think this subject may have popped up before and that was one of the conclusions?

Pretty alarming to hear that Ollie has changed so many fronts out:oops:! That pre-ride checklist is getting longer every year! Makes those carbon wheels seem even more attractive to anyone thinking of ‘pulling the trigger’!

BST Carbon Fibre Wheels for Norton 961/SS Commando 2006> onwards

BST Carbon Fibre Wheels for Norton 961/SS Commando 2006> onwards
www.bikehps.com www.bikehps.com

Another option - possibly?

Kineo Wire Spoked Motorcycle Wheels for Norton

Kineo Wire Spoked Motorcycle Wheels for Norton
www.bikehps.com www.bikehps.com

Afternote: DOH! Yes it’s been mentioned before! It’s an active thread on FB from earlier this month, involving Cliffa (OP). I have the memory of a goldfish sometimes:rolleyes:!
 
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Talon are a very mature company in this regard, I would wager they know what they’re doing, and that they’d laugh at any accusations to the contrary.

I think they might politely point out that SG employed apprentices to actually build the wheels.

Where you gonna look for ’point of cause’… Well established wheel company, or wheel building shed set up by a crook and staffed by apprentices all working in ‘zero cash / make do and mend’ conditions ??
 
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Fast Eddie said:
Talon are a very mature company in this regard, I would wager they know what they’re doing, and that they’d laugh at any accusations to the contrary.

I think they might politely point out that SG employed apprentices to actually build the wheels.

Where you gonna look for ’point of cause’… Well established wheel company, or wheel building shed set up by a crook and staffed by apprentices…??
Click to expand...
Makes the over-tightened spoke theory much more likely.
 
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