Chris Borneo Posted December 20, 2011 Report Share Posted December 20, 2011 (edited) So it doesn't matter that the crown race is going to bed into the aluminium fork and create a weak point exactly where trialtech were trying to eliminate one? If you know steel is good under compression, you'll know that aluminium isn't. I'm not an engineer, I'm not even a professional bike mechanic but I've built and broken enough bikes and components over the last 15 years to know that if there's a 1mm gap between the crown race and the crown, it's not a proper fit and if it's sitting on a part of the fork that the manufacturer considered a potential weak point, it's worth putting right. Edited December 20, 2011 by Chris Borneo Quote Link to comment Share on other sites More sharing options...
SamKidney Posted December 20, 2011 Report Share Posted December 20, 2011 (edited) If we're talking 1mm, then surely its easily enough done to cut a slit into the crown race, allowing it to expand ever so slightly to seat itself on the crown of the fork? I've done the very same when fitting a new headset, that required a new crown race on trialtech forks. The race wouldn't seat properly, so we created a split race, and on it slid. 1 and a half years on, still running perfectly. No damage done to either the headset or the fork. Edited December 20, 2011 by Echo Lite 09 Quote Link to comment Share on other sites More sharing options...
J.KYDD Posted December 20, 2011 Report Share Posted December 20, 2011 Tell you what, why not buy some trialtechs - and see if you can snap them at the steerer. You wont. 3 Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 20, 2011 Report Share Posted December 20, 2011 So it doesn't matter that the crown race is going to bed into the aluminium fork and create a weak point exactly where trialtech were trying to eliminate one? it's worth putting right. well, firstly it doesn't. Secondly it was designed and made that way so there is nothing to put right. It's not like the race is half way up a gradual curve or anything. Rather than make a crown with sharp angles that doesn't cope well with flex they designed a small radius to eliminate a week point. Hundreds of forks sold, not many returned = job well done I think? 2 Quote Link to comment Share on other sites More sharing options...
Matt Vandart Posted December 20, 2011 Author Report Share Posted December 20, 2011 Lolz, I'm an engineer ( ) and I see no problem in it, just wanted to make sure that it WAS there for THAT specific reason. I'm happy enough with it. Talk amongst yourselves. Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 20, 2011 Report Share Posted December 20, 2011 damm engineers! Quote Link to comment Share on other sites More sharing options...
isitafox Posted December 20, 2011 Report Share Posted December 20, 2011 Ideally, yes, or a larger one, but some manufacturers don't do this. It won't crack, because it's under equal force both ways (3rd law) - and it's under compression. steel is vrey strong in compression as you know. Works in theory, works in practice, job done! So it doesn't matter that the crown race is going to bed into the aluminium fork and create a weak point exactly where trialtech were trying to eliminate one? If you know steel is good under compression, you'll know that aluminium isn't. I'm not an engineer, I'm not even a professional bike mechanic but I've built and broken enough bikes and components over the last 15 years to know that if there's a 1mm gap between the crown race and the crown, it's not a proper fit and if it's sitting on a part of the fork that the manufacturer considered a potential weak point, it's worth putting right. well, firstly it doesn't. Secondly it was designed and made that way so there is nothing to put right. It's not like the race is half way up a gradual curve or anything. Rather than make a crown with sharp angles that doesn't cope well with flex they designed a small radius to eliminate a week point. Hundreds of forks sold, not many returned = job well done I think? 1 Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted December 20, 2011 Report Share Posted December 20, 2011 Just to go against the grain here, I can see exactly where Chris is coming from. A crown race is designed to sit on the crown of the fork, where the load is taken by the two flat surfaces. From what's being described the crown race is unable to seat properly so any load is being passed through a circular point load (does that make sense?) rather than through a surface. Doesn't sound ideal to me, although I'm well aware of how awesome and strong the forks are. Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 20, 2011 Report Share Posted December 20, 2011 damm engineers! Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted December 20, 2011 Report Share Posted December 20, 2011 Quote Link to comment Share on other sites More sharing options...
Matt Vandart Posted December 20, 2011 Author Report Share Posted December 20, 2011 I also understand where Chris is coming from but I rekon as long as the headset is not loose this will not be a problem. the split ring may well 'expand' however its not gonna expand much because of the way SL headsets are designed, its more of a wear ring or locator ring than a race, the race is within the bearing itself. I know you already know this dude but just saying for clarity of anyone following. Quote Link to comment Share on other sites More sharing options...
Chris Borneo Posted December 20, 2011 Report Share Posted December 20, 2011 Just to go against the grain here, I can see exactly where Chris is coming from. A crown race is designed to sit on the crown of the fork, where the load is taken by the two flat surfaces. From what's being described the crown race is unable to seat properly so any load is being passed through a circular point load (does that make sense?) rather than through a surface. Doesn't sound ideal to me, although I'm well aware of how awesome and strong the forks are. Stoked, someone who get's the point I was trying to make. Thought I was going to have to get my paint skills out and draw a diagram. I also understand where Chris is coming from but I rekon as long as the headset is not loose this will not be a problem. the split ring may well 'expand' however its not gonna expand much because of the way SL headsets are designed, its more of a wear ring or locator ring than a race, the race is within the bearing itself. I know you already know this dude but just saying for clarity of anyone following. I think it's more likley that either the crown race or the fork will become deformed but hopefully it won't cause you any major issues. Sounds like the trialtech forks are pretty tough anyway Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 20, 2011 Report Share Posted December 20, 2011 I knew what you meant, I was just pointing out that in this case it's just not a problem. Quote Link to comment Share on other sites More sharing options...
dave33 Posted December 20, 2011 Report Share Posted December 20, 2011 What headset was used to test the forks? Pretty sure most people used an echo headset theses days that has a split race, although you could say the manufracture of the headset has a design issue, simpl fix would be a larger chamfer to clear the radious on the crown race 1 Quote Link to comment Share on other sites More sharing options...
Chris Borneo Posted December 20, 2011 Report Share Posted December 20, 2011 (edited) What headset was used to test the forks? Pretty sure most people used an echo headset theses days that has a split race, although you could say the manufracture of the headset has a design issue, simpl fix would be a larger chamfer to clear the radious on the crown race To be fair, the headset manufacturer probably wouldn't expect there to be a radius at the steerer crown junction but I think you're right that it needs a bigger internal chamfer. Edited December 20, 2011 by Chris Borneo Quote Link to comment Share on other sites More sharing options...
Sam Nichols Posted December 20, 2011 Report Share Posted December 20, 2011 Give it up. Quote Link to comment Share on other sites More sharing options...
Mark W Posted December 21, 2011 Report Share Posted December 21, 2011 Years of these forks having no issues is sort of enough 'proof' to me that there isn't really a problem there. Stan's been using an SL headset with his Trialtech forks since before I started working with him, and he's had no problems. Trialtech are out of the most conscientious companies out there when it comes to design, so if they didn't have faith in it I doubt they'd release them. Again, no problems being reported with these forks sort of suggests that they were right to do so... Quote Link to comment Share on other sites More sharing options...
AkuskaUK Posted November 5, 2012 Report Share Posted November 5, 2012 Sorry to high jack the thread... What is stronger, 2013 Echo urban, 2009 echo urban or TrialTech's? Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted November 5, 2012 Report Share Posted November 5, 2012 Slight bump there Trialtech. Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted November 5, 2012 Report Share Posted November 5, 2012 Slight bump there Trialtech. yeah,kind of...hehe Quote Link to comment Share on other sites More sharing options...
AkuskaUK Posted November 5, 2012 Report Share Posted November 5, 2012 If that was in responce to me, Why though? Less flex? Stronger build? Are the 2013 better than the 09/12? Quote Link to comment Share on other sites More sharing options...
N.Wood Posted November 5, 2012 Report Share Posted November 5, 2012 Huh? Just get the Trialtechs. Quote Link to comment Share on other sites More sharing options...
trials hoe Posted November 5, 2012 Report Share Posted November 5, 2012 If that was in responce to me, Why though? Less flex? Stronger build? Are the 2013 better than the 09/12? come with the option of a massive offset too Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted November 5, 2012 Report Share Posted November 5, 2012 Well the forks in that video must be pretty old, the cable guide hasn't been on the disc forks for a long time. "Less flex? Stronger build? Are the 2013 better than the 09/12?" Yes, yes and that's subjective depending on what you mean by best. Quote Link to comment Share on other sites More sharing options...
trials hoe Posted November 5, 2012 Report Share Posted November 5, 2012 to be fair thats the only evidence i could find of a tt fork fail, but there's loads of urban snappage. and the tt is a tad longer to the cr than the urbans too? Quote Link to comment Share on other sites More sharing options...
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