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Old 08-02-06, 07:07 PM   #1
Prozakk
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Titanium's Purpose?

Are titanium parts for weight reduction only?

I noticed titanium axles aren't for street use (not strong enough).

What about other parts such as: spindles, cranks, crank bolts, axle nuts, stem nuts/bolts, pegs, etc.???
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Old 08-02-06, 07:17 PM   #2
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Just for weight savings.

Nuts and bolts should be fine, along with pegs.
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Old 08-02-06, 08:27 PM   #3
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Titanium pegs don't slide as well and are known to actually slow down the surface you are grinding.
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Old 08-02-06, 08:43 PM   #4
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The purpose of titanium is to inflate bike manufacturer profits.

See also: The Purpose of Aluminum. The Purpose of Carbon.
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Old 08-02-06, 09:26 PM   #5
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Titanium is stiffer than aluminum, so it is possible to run it as an axle or bolt which you cant with aluminum and it's considerably lighter than steel. However, because of it's properties it snaps instead of bending.
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Old 08-02-06, 09:29 PM   #6
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Titanium has very limited use in BMX. It's good for lightweight road bikes though. The single best application for MTBs is the pivot bolt for the rear derailleur. Your frame or hanger will give up the ghost long before a standard steel bolt. A $5 ti bolt snaps, saving your frame. Of course, SRP sells an aluminum one too.
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Old 08-03-06, 01:10 AM   #7
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Quote:
Originally Posted by sprintcarblue
Titanium is stiffer than aluminum, so it is possible to run it as an axle or bolt which you cant with aluminum and it's considerably lighter than steel. However, because of it's properties it snaps instead of bending.
Correct sir.
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Old 08-03-06, 06:12 AM   #8
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Quote:
Originally Posted by sprintcarblue
Titanium is stiffer than aluminum, so it is possible to run it as an axle or bolt which you cant with aluminum and it's considerably lighter than steel. However, because of it's properties it snaps instead of bending.
But it will bend or flex more than steel or aluminum before breaking. It has a much greater resistance to fatigue.
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Old 08-06-06, 10:19 AM   #9
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it's has one advantage in bmx, but its disadvantages are numerous.
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Old 08-06-06, 04:27 PM   #10
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Cheaper, stronger, lighter, pick two, never all three. Titanium is an expensive way to save weight.
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Old 08-06-06, 07:36 PM   #11
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Titanium isn't stronger.
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Old 08-06-06, 09:30 PM   #12
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Quote:
Originally Posted by GunzOfSteel 921
Titanium isn't stronger.
Neither is steel. Or aluminum for that matter. Stronger than what?
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Old 08-07-06, 03:01 AM   #13
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diamond haha
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Old 08-07-06, 06:41 AM   #14
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diamond haha
Diamonds are rated on the Rockwell hardness scale. Tubing that was as hard as a diamond would probably shatter.
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Old 08-07-06, 07:42 AM   #15
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Titanium is between steel and alumium in almost every physical category that matters in bike making. It's heavier than alu, lighter than steel. stronger both in flexing then returning to shape and in permanently bending/breaking than alu but weaker than steel in in both aspects.

For our bike building purposes I'm not sure it matters, but there is nothing particular about Titanium that I've ever read that suggests it's more prone to snap instead of bend. Again that's kind of moot because TI parts will generally be the weakest link in a bike system so thus fail first in most bike applications. But even steel will snap with the right application of force.

Aluminum is prone to snapping after a point. It develops fatigue and gets more brittle with each time it's bent. As a result, bike frames made from aluminum are "overbuilt" to the point of being both heavier and stronger than Titanium frames. This is why Titanium has it's place in lightweight bike building and why it has a reputation in some circles as being flexy.

Titanium also is highly corrosion resistant - not so important in BMX bikes for any reason that I can think of.
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Last edited by dalmore; 08-07-06 at 07:52 AM.
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Old 08-07-06, 05:03 PM   #16
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Quote:
Originally Posted by dalmore
Titanium is between steel and alumium in almost every physical category that matters in bike making. It's heavier than alu, lighter than steel. stronger both in flexing then returning to shape and in permanently bending/breaking than alu but weaker than steel in in both aspects.

For our bike building purposes I'm not sure it matters, but there is nothing particular about Titanium that I've ever read that suggests it's more prone to snap instead of bend. Again that's kind of moot because TI parts will generally be the weakest link in a bike system so thus fail first in most bike applications. But even steel will snap with the right application of force.

Aluminum is prone to snapping after a point. It develops fatigue and gets more brittle with each time it's bent. As a result, bike frames made from aluminum are "overbuilt" to the point of being both heavier and stronger than Titanium frames. This is why Titanium has it's place in lightweight bike building and why it has a reputation in some circles as being flexy.

Titanium also is highly corrosion resistant - not so important in BMX bikes for any reason that I can think of.
Failure is more dependent on application than materials.
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