BMXmuseum.com Forums

cdridesonly wrote:

Did Brand X make the Ti posts in 7/8"?

Havent seen a post that isnt 7/8th. Doesnt mean there isnt, but all the ones ive seen are 7/8ths.

My 24" Phase 2 mini.    pay no attention to the Uniblade in the background

*Titron* damn spell check,

A little ti project I made

I want to see bigger parts done like this so bad.

troynlori wrote:

Well....yeah, it's expensive, but it also seems to be reserved normally for small guys.  It has a much higher strength than steel, chrome moly, stainless steel, yet it seems like some people have suggested concerns with failure, and I'm wishing I better understood.

BTW - not to mix work with BMX, but I will tell you that I have stood in front of an ingot of titanium, lit to 3000F, that was close to 3' diameter x 18' long, and as well seen it melted in an arc melting furnace @ 18,000 amps.  Cool stuff.

I believe it's very strong but it's also brittle and can crack-it doesn't give at all like steel.  IMHO

One of the things that makes Ti awesome is that it has a higher resonance frequency than steel.  That means that it absorbs vibration better and gives a smoother ride by transferring less vibration to the body.  IMHO it is not for guys that beat on there $hit.  It's for racing and super smooth guys who rarely crash or case.  It has been used in Road and MTB applications with great success.  It's properties are fine for BMX but it's simply the cost that limits most companies from manufacturing with it in the BMX market.  Of course, it is done as shown in this thread but it is cost prohibitive for every one involved.  Personally, I would grab a custom in a heartbeat if I was still racing.  The availability of a custom Ti manufacturer for BMX BTD was non-existent.  IMHO Ti is the best of all worlds for BMX.  Stronger and lighter than steel.  What more do you want?  There is a reason race teams of all types depend on it.  It makes you faster!!!!!

Just found this one right here in the museum. 2010 Sash 24

JS-44SDS wrote:

pr200 wrote:

Its the little things..................

Triton Titanium seat clamp and Headset Lock.

http://i315.photobucket.com/albums/ll46 … ile019.jpg

Now on this.....

http://i315.photobucket.com/albums/ll46 … NGA011.jpg

B

I believe those are Magnesium.   The only way to tell is by the weight.  The seat clamp should weigh about 40 grams and I have to weigh my Mag. HS lock for you to be sure.

S,

My bad.....you are 100% corect ....half asleep when i contributed to this thread.

B

JC82 wrote:

Legendofjd3 wrote:

I wonder about the strength of titanium myself. It's used in mountain biking quite a bit. Don't hear many issue's there. Yet in bmx where it is used very rarely it seems like everyone has an opinion on it. It's to flexy, breaks easy, are some of the ones I hear a lot.
Are this many people trying out titanium bmx bikes?

Personally, I think if a frame is made well enough it will take some abuse. It's hard to make a judgement on titanium based solely on Eastern's ti bike. That thing had cut outs all over and weighed just over 2 pounds. Seems pretty fragile to me.

But if a company built a 3.5 pound 20' frame I'm sure it can withstand most anything thrown at it.

The problem is cost to stiffness. Ti flexes more than an aluminum frame would. Plus with the likes of redlines ultra stiff carbon project 79 and supercross' envy v3 that weighs 2 and half lbs theres no reason to really use all that much ti except for bolts. Alum and carbon technology has come so far since the mid 90s.

Incorrect. Titanium is stiffer, lighter, and stronger than aluminum, but costs 3 times more. The cost is what keeps it from being used.

Titanium is heavier than aluminum, lighter than steel/chrome moly and stronger (per pound) than all of them.  The thing that makes the most sense to me in terms of the strength issue is the suggestion about "stiffness".  Some things are stronger because they flex.  It has to do with how the loads are actually absorbed.  If something is ridgid, then the load that will be applied to joints, etc is much higher than if it is flexible and absorbs/spreads loads out over time.  The fact that airplane wings flex or house structures flex makes them more able to withstand wind.  Or a car with shock absorbers will not shake apart like a car without. 

So Ti is stronger, but the stiffness causes higher specific loads on the framework. It's clearly a design issue because the best frame material to use for a jet is Ti.

I think above makes sense engineering-wise....I hope.