Titanium Hub?

Hey everyone,

I have a question about the Ti hub. What is the weight difference
between it and the regular KH hub (08)?

Also, how much stronger is it? Is it worth it to get it if your not
breaking your normal hub?


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hungry4uni;1168406 wrote:
I have a question about the Ti hub. What is the weight difference
between it and the regular KH hub (08)?

According to Unicycle.co.uk

Kris Holm Titanium ISIS Hub Weight: 425g. Weighs 200g less than the
2008 KH ISIS hub with CrMo axle.

Kris Holm ISIS Moment Hub 2008 Weighs (including bolts and spacers):
644g

Nimbus ISIS Hub Weighs: 600g (635g including bolts and spacers)

Onza ISIS Hub Weighs: 600g (635g including bolts and spacers)

Kris Holm/Onza splined 36-hole hub- 2005 model Hub Weight: 680g (with
bearings & bolts)

Qu-Ax ISIS Hub (red) Weighs (including bolts, bearings and spacers):
815g

Suzue Unicycle cotterless hub Weight - 530 / 525g with bearings,
spacers & nuts.

According to Unicycle.co.nz

KH Moment Titanium Hub Weighs a miniscule 426g including bolts,
bearings and spacers!

KH Moment ISIS Hub Weight (including bolts and spacers): 644g

KH-Onza 36-hole hub- 2005 model Weight: 500 g (bare), 650 g (including
bearings, bolts and spacers)

According to Unicycle.com (USA)

Kris Holm Titanium Hub Weight: 1 lb w/hub bolts & spacers (453g)

Nimbus ISIS Hub (36-Hole) Weighs: 1.4 lbs (including bolts and spacers)
(635g)

Poznanter/Profile Hub Weight 2 pounds (907g)

It weighs less than a suzue (half a kilogram) and the old best hub
weighs nearly 1kg. It would be nice to have but with a price like that
not everyone can afford one.


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For the record, titanium is weaker than steel, and unless there is
something funny about the heat-treatment process on the hubs, the ti hub
should be weaker than the steel hub (possibly by a significant
difference). Also, strong welds in titanium are much harder to do than
in steel (much less tolerant of contaminants), so the welded flanges
have a much bigger risk of breaking at the welds than the steel hubs do.
I believe Tony Melton already broke a hub in this fashion.


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gerblefranklin;1168445 wrote:
. I believe Tony Melton already broke a hub in this fashion.

Tony too?
You might be talking about 'Joe Dyson'
(http://www.unicycle.org.nz/bb/viewtopic.php?t=2172).
[image:
http://i7.photobucket.com/albums/y28.../IMG_1933.jpg]


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gerblefranklin;1168445 wrote:
For the record, titanium is weaker than steel, and unless there is
something funny about the heat-treatment process on the hubs, the ti hub
should be weaker than the steel hub (possibly by a significant
difference). Also, strong welds in titanium are much harder to do than
in steel (much less tolerant of contaminants), so the welded flanges
have a much bigger risk of breaking at the welds than the steel hubs do.
I believe Tony Melton already broke a hub in this fashion.



Thank you. Was about to say something along these lines.


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how is titanium weaker than steel?

everything i've ever heard says that titanium is far stronger than
steel by weight/strength ratios
unless titanium is far less dense...but that makes no sense, i want to
see some background to what you're saying. show me where you are getting
this from.


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I wish I had my old text books handy with all the properties of common
metals and alloys but I seem to remember carbon steel and titanium
having similar strength but titanium weighing about 60% as much as the
steels.


A google search could probably verify this.


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skrobo;1169130 wrote:
how is titanium weaker than steel?

everything i've ever heard says that titanium is far stronger than
steel by weight/strength ratios
unless titanium is far less dense...but that makes no sense, i want to
see some background to what you're saying. show me where you are getting
this from.



If weight doesn't matter Ti is stronger, but on bikes and unicycles,
weight matters and Titanium is used to save weight.

Is impossible to say if it's strong or not. Depends of the weld quality
and design.

Ti is lighter cause it's strong than ALUMINIUM and you can use really
thin walls. But if the walls are to thin it may breaks, like any other
materials brakes. Also Ti is really rigid and don't flex!


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