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Industry Nine vs Chris King

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Old 10-18-11 | 09:57 AM
  #26  
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^^ You weren't around for some of our discussions with Falanx over the finer points of metallurgy .
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Old 10-18-11 | 10:01 AM
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Old 10-18-11 | 10:17 AM
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Originally Posted by cryptid01
Is it really the "stretch" that adds strength? If so, why don't they make spokes out of rubber bands? Or is it in fact the tensile strength (aka resistance to "stretch") of the spokes that gives the wheel its strength?
Well, that's a matter of semantics, I think. Any material will stretch when placed under tension, it's just a matter of how much. You could very easily make a wheel out of rubber bands, if you could find any that wouldn't exceed their elastic limit under the required tension.

And aluminum actually has a lot less resistance to stretch than steel: aluminum has a Young's modulus of 60, and steel has a Young's modulus of 200. That means that you have to make aluminum spokes thicker to achieve the same spring constant as a steel spoke. Steel also has a much higher ultimate tensile strength (860 Mpa) than aluminum (483 Mpa).

So I guess I don't see your point.
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Old 10-18-11 | 11:09 AM
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If you look at the spokes...they're hella thicker. Just like an aluminum frame tube is hella bigger than steel. Still...why would alu spokes vs. steel be any different than alu frame vs. steel?

Next thang you know, they'll be doing 8-bladed carbon spokes...or even worse...maybe a 3 bladed composite.
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Old 10-18-11 | 11:22 AM
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Originally Posted by dminor
I do not doubt at all the strength of I9 spokes - - but "machined from billet" in and of itself does not imply strength; especially since we both know an aluminum piece that is manipulated by forging can be much stronger than its machined billet counterpart.
I wasn't trying to imply that billet made them stronger. They're stronger for other reasons (described in I9's FAQ).

Originally Posted by ed
I could get 2prs of HP2's that have proven 4-5yrs strong for the price of 1pr of I9's. I think the argument is hitting that point:
Ah yes, of course. Welcome to bikeshoppingforums™, where technical discussions of leading edge cycling products are subverted in order to make room for "which clapped out early 90's POS can I get for under a hundred bucks" threads.

Originally Posted by corvuscorvax
And aluminum actually has a lot less resistance to stretch than steel: aluminum has a Young's modulus of 60, and steel has a Young's modulus of 200. That means that you have to make aluminum spokes thicker to achieve the same spring constant as a steel spoke. Steel also has a much higher ultimate tensile strength (860 Mpa) than aluminum (483 Mpa).
I9 spokes *are* larger in diameter. And steel's ultimate tensile strength is compromised when stress risers are introduced during the manufacturing process. So perhaps the difference is not as significant as you think.

Originally Posted by corvuscorvax
So I guess I don't see your point.
No point really - just trying to help you understand why something works when you think it shouldn't.
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Old 10-18-11 | 11:27 AM
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Originally Posted by ed
...or even worse...maybe a 3 bladed composite.
Ya, what's up with that, anyway?

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Old 10-18-11 | 11:43 AM
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Wow...they made a disc version?
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Old 10-18-11 | 11:59 AM
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Originally Posted by ed
Next thang you know, they'll be doing 8-bladed carbon spokes...or even worse...maybe a 3 bladed composite.
...which are all now pretty much universally regarded as having been Really Dumb Ideas.

I hadn't actually looked at the reviews for the I9's on MTBR:

The spokes break easily. If you happen to bend your derailleur and your chain goes into your spokes, you'll be replacing most of them soon. Not great when each spoke costs $5 and are not trivial to get. I finally made a spoke guard (dork disc) and I still break spokes. When you do break spokes, they are a pain to replace.
I also broke a LOT of spokes; it seemed that once they got gouged w/ a rock they would break.
The wheel system is difficult to maintain even tension, truing precision is becomes more difficult as the wheels get older due to increased spoke wind up. The spokes break easily particularly once they are scored. Replacement spokes are only available from one source and all sizes are not always readily available.
People seem to have fewer problems with the 26" wheelsets. (And at least it's a good thing that I9's customer service is rated highly.)

I think I'll stick with handbuilt 32 3X with butted steel, thank you very much. And to the OP: King.

Last edited by corvuscorvax; 10-18-11 at 12:16 PM.
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Old 10-18-11 | 12:17 PM
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Originally Posted by corvuscorvax

I think I'll stick with handbuilt 32 3X with butted steel, thank you very much.
And what material will your rims and hub shells be made of?
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Old 10-18-11 | 12:20 PM
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Originally Posted by cryptid01
And what material will your rims and hub shells be made of?
Aluminum, definitely. Except the nipples, which will be brass. Alloy nipples suck.
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Old 10-18-11 | 02:26 PM
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For someone self titled as "humorless," your posts sure do make me laugh.

How do you reconcile the statement

Originally Posted by corvuscorvax
Aluminum, definitely.
with your earlier statement

Originally Posted by corvuscorvax
it would take me a lot of convincing to feel comfortable with a prestressed structure made out of aluminum, since aluminum doesn't stretch nicely
and for that matter, this bridge:

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Old 10-18-11 | 02:30 PM
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Originally Posted by ed
Wow...they made a disc version?
I think that's about all TAG made. Guy around here rocked a set of 5-spokes on his big ol' Rotec RL9 and probably still has 'em to this day.
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Old 10-18-11 | 02:57 PM
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Remember the Spin mag? Identical to the TAG...cept it was pre-disc. Probably got the same factory to produce them.
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Old 10-18-11 | 03:15 PM
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Originally Posted by cryptid01
How do you reconcile the statement [...] with your earlier statement [...] and for that matter, this bridge:
Neither a hub nor that bridge are prestressed (or, more precisely for a bicycle wheel, pretensioned.)
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Old 10-18-11 | 03:16 PM
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Originally Posted by ed
Remember the Spin mag? Identical to the TAG...cept it was pre-disc. Probably got the same factory to produce them.
Yeah, I do recall those. I'm actually pretty sure TAG was doing their own mfg right there in their Newprort Beach, CA facility. (George Kotzeff, TAG's president, came from elsewhere in the injection-molding industry.) The FRX5s were fiberglas-reinforced DuPont Zytel 8018 nylon resin (the three-spokers were CF). And I don't think durability was ever an issue with them - - they were just heavy.
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Old 10-18-11 | 04:30 PM
  #41  
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They be lookin the same to me:

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Old 10-18-11 | 04:31 PM
  #42  
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Originally Posted by corvuscorvax
Ksyriums have stainless spokes. (Edit: or "zircal", whatever that is.)

I heard Absalon still rides a 26".

FWIW, I didn't say they didn't work. I said I don't understand why they do. Very different.
7075 aluminium alloy has been sold under various trade names including Zicral, Ergal and Fortal

As in these

https://www.ebay.com/itm/MAVIC-Crossm...item5646923b64

Which I was soooo close to getting.
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Old 10-18-11 | 04:49 PM
  #43  
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Originally Posted by dminor
Yeah, I do recall those. I'm actually pretty sure TAG was doing their own mfg right there in their Newprort Beach, CA facility. (George Kotzeff, TAG's president, came from elsewhere in the injection-molding industry.) The FRX5s were fiberglas-reinforced DuPont Zytel 8018 nylon resin (the three-spokers were CF). And I don't think durability was ever an issue with them - - they were just heavy.
He was in the rocket science industry iirc. I chatted with those guys at crankworx way back when. In fact, I'd probably be on them today if 1) they were competitive weight wise and 2) they had better hubs. The FRX5's were built around hugis.

And you're right, durability was not an issue. Fast forward to 3:20

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Old 10-18-11 | 04:52 PM
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Originally Posted by ed
I could get 2prs of HP2's that have proven 4-5yrs strong for the price of 1pr of I9's. I think the argument is hitting that point:

How can you put a price on Purdy

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Old 10-18-11 | 05:52 PM
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Originally Posted by gbg
How can you put a price on Purdy

Ahhh Same color scheme as mine! Only cleane,,,,, much cleaner.
I remember when mine were clean

Last edited by born2bahick; 10-18-11 at 05:59 PM.
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Old 10-18-11 | 06:05 PM
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Dam. My Campag chain rings are aluminium. Should I get rid ?
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Old 10-18-11 | 06:19 PM
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King is a better made hub IMO but the I9 with their straight and thick aluminum spokes makes the stiffest, toughest wheel out there. Simple to replace broken spokes and super helpful on the phone if you need parts. Both are great tho...
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Old 10-19-11 | 10:02 AM
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I wanna try the discombobulator!
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