aaroncosbey Posted July 6, 2008 Report Share Posted July 6, 2008 I'm looking at getting a TI BB for the first time.... The FSA ones look good on CRC for £65: But only come in 108mm Does anyone know of any 128mm ones that are tried and tested? Quote Link to comment Share on other sites More sharing options...
JonMack Posted July 6, 2008 Report Share Posted July 6, 2008 Mind if I ask why? From reading weight weenies they're about 194g + bolts, a normal platinum pro is only 236g + bolts, so you're only saving 42g... Quote Link to comment Share on other sites More sharing options...
Mat Smith! Posted July 6, 2008 Report Share Posted July 6, 2008 Mind if I ask why? From reading weight weenies they're about 194g + bolts, a normal platinum pro is only 236g + bolts, so you're only saving 42g... considering they cut nobbles off there tyres and use ti bolts over alu/steel thats a big difference.. lol. Matx Quote Link to comment Share on other sites More sharing options...
JonMack Posted July 6, 2008 Report Share Posted July 6, 2008 I've cut knobs off my tyres Quote Link to comment Share on other sites More sharing options...
aaroncosbey Posted July 6, 2008 Author Report Share Posted July 6, 2008 TI is lighter, but is less likely to break than steel. I snapped my echo one yesterday by just pedaling rather than dropping or gapping etc... I need to know i can rely on by BB. Quote Link to comment Share on other sites More sharing options...
ogre Posted July 6, 2008 Report Share Posted July 6, 2008 TI is lighter, but is less likely to break than steel. I snapped my echo one yesterday by just pedaling rather than dropping or gapping etc... I need to know i can rely on by BB. get an skf bb, strong as f**k + mad reliable.. Quote Link to comment Share on other sites More sharing options...
aaroncosbey Posted July 6, 2008 Author Report Share Posted July 6, 2008 get an skf bb, strong as f**k + mad reliable.. I totally agree... its weights around a ton though! Every gram counts Quote Link to comment Share on other sites More sharing options...
PaRtZ Posted July 6, 2008 Report Share Posted July 6, 2008 (edited) I totally agree... its weights around a ton though! Every gram counts drill it out then Edited July 6, 2008 by PaRtZ Quote Link to comment Share on other sites More sharing options...
Shaun H Posted July 7, 2008 Report Share Posted July 7, 2008 TI is lighter, but is less likely to break than steel. I snapped my echo one yesterday by just pedaling rather than dropping or gapping etc... I need to know i can rely on by BB. Titanium is actually weaker than steel. It is ~45% lighter though. Quote Link to comment Share on other sites More sharing options...
streetjibs Posted July 7, 2008 Report Share Posted July 7, 2008 im on a v!z ti bb at the mo.. 128. seems ok.. been about 6months soo far no dramas... but wouldnt get it if you big move rider or street dogg. go SKF or sommat.. Quote Link to comment Share on other sites More sharing options...
basher Posted July 7, 2008 Report Share Posted July 7, 2008 Get a gigapipe bb absolute beast bb's last yonks. Its no good saving weight in the wrong areas, tartyadam has ultra light builds but if you ask him he'll tell you to only save weight in the right places such as going with the heavier tyres as they have better preformance but take weight from things like the excess material on the bashring as it isn't neeed, you need to have a bike that is actually useable and good preformance and can take some punishment. Your bb is a pritty vital part that you dont want to skimp on as if it break you could have a nastey leg/foot injury. Go with a strong heavier bb and take weight from somewhere else. Quote Link to comment Share on other sites More sharing options...
eskimo Posted July 7, 2008 Report Share Posted July 7, 2008 Titanium is actually weaker than steel. It is ~45% lighter though. Isn't strength and toughness different though? I'm not really clear on it all. But it's also brittle being the problem. Quote Link to comment Share on other sites More sharing options...
Shaun H Posted July 7, 2008 Report Share Posted July 7, 2008 Isn't strength and toughness different though? I'm not really clear on it all. But it's also brittle being the problem. They are yes, both are important in this application but I don't know anything about how steel and ti alloy's toughness compares. Brittleness isn't too much of a problem unless it actually fails. The best steel alloys to use for BBs are also pretty brittle themselves, Dan snapped a steel V!Z one not so long ago and the material had pretty much shattered where it had gone. Quote Link to comment Share on other sites More sharing options...
Tim/Trialsin USA Posted July 7, 2008 Report Share Posted July 7, 2008 (edited) Titanium is actually weaker than steel. It is ~45% lighter though. That is in pure form. Titanium is never used in bike parts without being alloyed with something else. Because of this, making any blanket statements about titanium parts will most often be in error. As for the "every gram counts" view. There are certain parts, upon failing, that can affect your ability to reproduce. Parts like spindles/axles and such always require erring on the side of strength. Edited July 7, 2008 by Tim/Trialsin USA Quote Link to comment Share on other sites More sharing options...
Shaun H Posted July 7, 2008 Report Share Posted July 7, 2008 (edited) That is in pure form. Titanium is never used in bike parts without being alloyed with something else. Because of this, making any blanket statements about titanium parts will most often be in error. Well if you're going to be really pedantic then pure titanium isn't ~45% lighter either However I'm fairly sure my statement stands generally for both Ti alloys and steel alloys. Like you said though blanket statements when talking about alloys are usually in error (particularly regarding steel, for which there are hundreds and hundreds of different alloys) as there is so much variation in their properties Edited July 7, 2008 by Shaun H Quote Link to comment Share on other sites More sharing options...
Tim/Trialsin USA Posted July 8, 2008 Report Share Posted July 8, 2008 Well if you're going to be really pedantic then pure titanium isn't ~45% lighter either However I'm fairly sure my statement stands generally for both Ti alloys and steel alloys. Like you said though blanket statements when talking about alloys are usually in error (particularly regarding steel, for which there are hundreds and hundreds of different alloys) as there is so much variation in their properties Sorry, did not mean to come off as a putz. I guess I just did not want to go into a long boring schpeel about materials. Generally speaking....Ti is stronger, but will snap before it bends. There are always trade offs. I agree, there are many different things labeled titanium or steel. Aluminum is another one that is hard to nail down...... as 7075 from one source might be great, but from somewhere else crap. Quote Link to comment Share on other sites More sharing options...
forteh Posted July 8, 2008 Report Share Posted July 8, 2008 Just picked up a hope titanium BB 122.5 for 43 quid on fleabay - will let you know how it goes Square taper mind so no good for you Quote Link to comment Share on other sites More sharing options...
jsychem Posted July 8, 2008 Report Share Posted July 8, 2008 Isn't strength and toughness different though? I'm not really clear on it all. But it's also brittle being the problem. I have done d.t. gcse this year so knew where to find it. http://www.bbc.co.uk/schools/gcsebitesize/...rialsrev3.shtml Toughness is the ability of a material to withstand blows or sudden shocks without breaking. Hope that helps! Quote Link to comment Share on other sites More sharing options...
Jsy Ben Posted July 8, 2008 Report Share Posted July 8, 2008 Quote Link to comment Share on other sites More sharing options...
Tim/Trialsin USA Posted July 8, 2008 Report Share Posted July 8, 2008 It is obviously the lack of magnetic permeability and the fact it can handle 400C on those really warm summer days.......... Quote Link to comment Share on other sites More sharing options...
Jsy Ben Posted July 9, 2008 Report Share Posted July 9, 2008 Huh? sacism? meh, just thought i'd throw it in...might be usefull to someone/somewhen/somewhere Quote Link to comment Share on other sites More sharing options...
2sixstreet Posted July 9, 2008 Report Share Posted July 9, 2008 Titanium is actually weaker than steel. It is ~45% lighter though. Weaker and lighter means you need more of it to bring it back up to the same standard as traditional materials like steel. Ti alloy is also very good at bending/flexing which I wouldn't want in my BB, pedals, bolts etc... I agree with saving weight in the right places, go for steel. Quote Link to comment Share on other sites More sharing options...
forteh Posted July 9, 2008 Report Share Posted July 9, 2008 Ti-6Al-4V titanium has a yield stress double that of 4130 chromoly, commercially pure (basically unalloyed ti) is about the same yield as 4130. My hope ti BB has a 6al/4v axle, Im not particularly concerned about it as Ive never snapped a steel one I believe that the triton frame is manufactured from russian OT4 titanium which is Ti-4.3Al-1.4Mn, I reckon somewhere between commercially pure titanium and 6Al-4V, the frame is lighter than an aluminium one and as strong, if not stronger than a steel one Sources: http://www.onlinemetals.com/titaniumguide.cfm http://www.onlinemetals.com/alloysteelguide.cfm http://www.grandis.com/rusalloys.html Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.