Shaun H Posted November 24, 2008 Report Share Posted November 24, 2008 Think of it like a touring car compared with a stock car... One is heavier with less performance but will take some knocks, the other is super light with very high performance and will only take one or two knocks.Clearly you've not watched enough touring car racing Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted November 24, 2008 Report Share Posted November 24, 2008 Haha, yeah true, not as many knocks as a banger anyway Couldn't think of a better example at the time. Quote Link to comment Share on other sites More sharing options...
forteh Posted November 24, 2008 Report Share Posted November 24, 2008 http://koxx.fr/index.php?lg=en_EN&sec=...DB4589685607dfb - the graph shows UTS (Ultimate Tensile Strength).UTS is worthless though, its the yield strength that you need. Basically what theyre saying is that K-alone is a stiff, brittle material - as being demonstrated with them cracking Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted November 24, 2008 Report Share Posted November 24, 2008 UTS is worthless though, its the yield strength that you need.I guess so, but as you will know, the yield and UTS are usually very close in their ratios across all aluminium alloys. Perhaps the yield of K-Alone actually increases relative to the UTS (when compared with the other common grades)?6061: http://www.matweb.com/search/DataSheet.asp...13bad6044b3f318 - 290/2557005: http://www.matweb.com/search/DataSheet.asp...9a80ecbee94406e - 350/2906066: http://www.matweb.com/search/DataSheet.asp...dc5b342ef1ab84b - 393/359 Quote Link to comment Share on other sites More sharing options...
forteh Posted November 24, 2008 Report Share Posted November 24, 2008 I guess so, but as you will know, the yield and UTS are usually very close in their ratios across all aluminium alloys. Perhaps the yield of K-Alone actually increases relative to the UTS (when compared with the other common grades)?That may be the case, I dont know, but once the yield stress has been reached the material work hardens until failure at the uts. If the yield stress of k-alone is higher than common comparable alloys, then yes it coud be a stronger material for use in a trials frame. Simply stating that the uts is higher than other alloys (about 450 mpa) doesnt mean that its stronger Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted November 24, 2008 Report Share Posted November 24, 2008 Simply stating that the uts is higher than other alloys (about 450 mpa) doesnt mean that its stronger I can't remember all of my course any more, but surely if the Ultimate Tensile Strength is higher the material can therefore be classed, in one sense, as stronger? Even if it can't, it almost certainly means it isn't weaker than other alloys which have a lower UTS, especially given the trends shown across all the other common aluminium alloys used in bicycle frames.Anyway, this thread is going a bit off topic really, pictures have been sent to Koxx and this thread isn't doing its' chances of being replaced any favours Quote Link to comment Share on other sites More sharing options...
forteh Posted November 24, 2008 Report Share Posted November 24, 2008 I can't remember all of my course any more, but surely if the Ultimate Tensile Strength is higher the material can therefore be classed, in one sense, as stronger? Even if it can't, it almost certainly means it isn't weaker than other alloys which have a lower UTS, especially given the trends shown across all the other common aluminium alloys used in bicycle frames.Different materials have a different stress/strain curve depending on what characteristics they display under load; what can apply to one material may not apply to another. Just peeves me a bit when manufacturers state that their material is stronger than anyone elses without giving enough info to back up that claim. The xtp2 is known to crack and whether thats generally a design or material failure I dont know.Anyway, this thread is going a bit off topic really, pictures have been sent to Koxx and this thread isn't doing its' chances of being replaced any favours Indeed, I will say no more about k-alone, sorry for the off topic banter Quote Link to comment Share on other sites More sharing options...
Mark W Posted November 24, 2008 Report Share Posted November 24, 2008 Anyway, this thread is going a bit off topic really, pictures have been sent to Koxx and this thread isn't doing its' chances of being replaced any favours Have Koxx written forum discussion into their warranty void list yet, or is it still an unofficial thing? Quote Link to comment Share on other sites More sharing options...
Ben H! Posted November 24, 2008 Report Share Posted November 24, 2008 I knew you'd eventually crack it some time jamie, bad luck though, what you riding nowBen. Quote Link to comment Share on other sites More sharing options...
Adrian Posted November 24, 2008 Report Share Posted November 24, 2008 Don't you weigh like 6 stone?Anyway, sorry for your loss.i remember when loads of people had a go at me saying koxx frames ARE really strong and stronger then deng....hmmm yea must be true Quote Link to comment Share on other sites More sharing options...
Dave Anscombe Posted November 25, 2008 Report Share Posted November 25, 2008 Back to deng when mine goes.......guess its only a matter of time Dave sorry to hear about that jamie Quote Link to comment Share on other sites More sharing options...
eskimo Posted November 25, 2008 Report Share Posted November 25, 2008 i remember when loads of people had a go at me saying koxx frames ARE really strong and stronger then deng....hmmm yea must be trueThat was probably true 6 years ago. Quote Link to comment Share on other sites More sharing options...
JamieWilliams Posted November 25, 2008 Author Report Share Posted November 25, 2008 I knew you'd eventually crack it some time jamie, bad luck though, what you riding nowBen.Thanks for all the comment And I'm riding this for now Jamie Quote Link to comment Share on other sites More sharing options...
cam217 Posted November 25, 2008 Report Share Posted November 25, 2008 inevitable really my koxx level boss cracked four times ! one of witch was on the downtube,my bro's koxx cracked and my mates koxx cracked want my advice stick to deng 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.