Matt Vandart Posted December 17, 2011 Report Share Posted December 17, 2011 I have bought a new set of trial tech forks and when fitted with echo sl headset there is a gap of about 1mm under the bottom race of the headset. On removal and inspection it seems the seat for this race on the forks is filleted rather than squarecut. Is this normal? Quote Link to comment Share on other sites More sharing options...
philgresty Posted December 17, 2011 Report Share Posted December 17, 2011 pretty sure the forks have an integrated crownrace, take your race off and see if the bearing runs against the forks okay without Quote Link to comment Share on other sites More sharing options...
isitafox Posted December 17, 2011 Report Share Posted December 17, 2011 And how would that work exactly?? Quote Link to comment Share on other sites More sharing options...
bike_dummie Posted December 17, 2011 Report Share Posted December 17, 2011 I bought some trialtech forks earlier this year and i run a crown race (fsa orbit xtreme pro) with no problems and no 1mm gap, maybe they changed the design? Quote Link to comment Share on other sites More sharing options...
Mikee Posted December 17, 2011 Report Share Posted December 17, 2011 Have you got the split wedges the right way around? Quote Link to comment Share on other sites More sharing options...
philgresty Posted December 17, 2011 Report Share Posted December 17, 2011 And how would that work exactly?? pretty much all bmx forks have integrated crown races, the crown is in such a shape to sit against the bearing eliminating the need for a crown race my 2011 sl forks do, and im sure my trialtechs did aswellhttp://www.tartybikes.co.uk/20_inch_forks/echo_sl_20_inch_2011/c13p11618.html <<LIKE THIS im sure i ran my trialtechs as im running the sls now, without a race Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 17, 2011 Report Share Posted December 17, 2011 to clear things up, the Trialtech fork doesn't have an integrated race. secondly, there may be a gap under the race when installed as the Trialtech fork's crown race has a curved cut edge for strength as a lot of forks with a square cut races end up snapping. Quote Link to comment Share on other sites More sharing options...
Matt Vandart Posted December 18, 2011 Author Report Share Posted December 18, 2011 I thought that may be the case, thanks Ali Quote Link to comment Share on other sites More sharing options...
Chris Borneo Posted December 18, 2011 Report Share Posted December 18, 2011 I can see the advantage of having a smooth transition at the point where the steerer meets the crown but surely you'd need the bearing race to have a similar internal radius to allow it to seat properly on the crown? If the crown race is seated part way up the curved transition it's going to be trying to expand every time you put downward pressure on it and eventually it'll crack. Quote Link to comment Share on other sites More sharing options...
craigjames Posted December 18, 2011 Report Share Posted December 18, 2011 I can see the advantage of having a smooth transition at the point where the steerer meets the crown but surely you'd need the bearing race to have a similar internal radius to allow it to seat properly on the crown? If the crown race is seated part way up the curved transition it's going to be trying to expand every time you put downward pressure on it and eventually it'll crack. True but a bearing race cracking seems a fair trade off when you're removing a key weak point that could cause you to lose your teeth. Quote Link to comment Share on other sites More sharing options...
Chris Borneo Posted December 19, 2011 Report Share Posted December 19, 2011 True but a bearing race cracking seems a fair trade off when you're removing a key weak point that could cause you to lose your teeth. No, it would be stupid, when you could get one that fits properly and wouldn't crack. Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 19, 2011 Report Share Posted December 19, 2011 you are talking as if this is something that happens? Quote Link to comment Share on other sites More sharing options...
craigjames Posted December 19, 2011 Report Share Posted December 19, 2011 I've never heard of a bearing race cracking, but then I've never heard of a set if trialtechs snapping at the steerer either. So I don't are a problem with the small radius at all. I know it was a weak point on older rockman forks where the area wasnt radiused causing a stress riser and the steerer to snap. Quote Link to comment Share on other sites More sharing options...
p_ruskin Posted December 19, 2011 Report Share Posted December 19, 2011 I've never heard of a bearing race cracking, but then I've never heard of a set if trialtechs snapping at the steerer either. So I don't are a problem with the small radius at all. I know it was a weak point on older rockman forks where the area wasnt radiused causing a stress riser and the steerer to snap. Kyle snapped a pair of fairly new trialtechs at the base of the steerer earlier this year Quote Link to comment Share on other sites More sharing options...
J.KYDD Posted December 19, 2011 Report Share Posted December 19, 2011 Kyle snapped a pair of fairly new trialtechs at the base of the steerer earlier this year Yes, but not at the actual crown race. Kyle's snapped about halfway round the curve if I remember right. Also, he taps like a freeekin' machine Quote Link to comment Share on other sites More sharing options...
LauraPalmer Posted December 19, 2011 Report Share Posted December 19, 2011 how did that fork (26") change the feel of your bike? Anyone who came from a 400x35 fork would share his experience(inkluding your headangle) please? Quote Link to comment Share on other sites More sharing options...
Chris Borneo Posted December 19, 2011 Report Share Posted December 19, 2011 (edited) you are talking as if this is something that happens? I'm not saying it's definately going to fail but if the crown race is sitting 1mm above the crown, something isn't seated right. I had a look at the SL headset and it has a split in the crown race so that won't crack but the underside has an internal chamfer not a fillet. If left to bed in it could create two angled transitons between the steerer and the crown negating the fillet that trialtech have machined into the fork for strength and making two potential weak points where you don't want them. Clearly I'm just playing devil's advocate here but something's not right and if it was my bike, I'd try n get the crown race seated properly before riding. I'd probably start by emailing trialtech to see if it's something they've come across already. I'm not trying to be a pr#*K about it, I'm just trying to offer what I think is good advice. Edited December 19, 2011 by Chris Borneo Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 19, 2011 Report Share Posted December 19, 2011 I'm not saying it's definately going to fail but if the crown race is sitting 1mm above the crown, something isn't seated right. well, in this case, it is right Quote Link to comment Share on other sites More sharing options...
Chris Borneo Posted December 19, 2011 Report Share Posted December 19, 2011 well, in this case, it is right Ha ha, considering the overwhelming evidence supporting your argument, oh wait, no, I'm still not convinced. Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 19, 2011 Report Share Posted December 19, 2011 let me guess, are you an "engineer" by any chance? 2 Quote Link to comment Share on other sites More sharing options...
N.Wood Posted December 19, 2011 Report Share Posted December 19, 2011 Ha ha, considering the overwhelming evidence supporting your argument, oh wait, no, I'm still not convinced. Ali helped develop the forks? Quote Link to comment Share on other sites More sharing options...
Ali C Posted December 19, 2011 Report Share Posted December 19, 2011 I tested them, but the design was all Trialtech's Quote Link to comment Share on other sites More sharing options...
Sam Nichols Posted December 19, 2011 Report Share Posted December 19, 2011 Ha ha, considering the overwhelming evidence supporting your argument, oh wait, no, I'm still not convinced. The proof of the pudding is in the eating? I think sometimes people forget that if theory was foolproof there would be no need for prototypes. Quote Link to comment Share on other sites More sharing options...
Azarathal Posted December 19, 2011 Report Share Posted December 19, 2011 I'd probably start by emailing trialtech to see if it's something they've come across already. Seeing as how its been mentioned that its designed to be like that I'm sure it's something that Trialtech are already aware of. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted December 20, 2011 Report Share Posted December 20, 2011 bearing race to have a similar internal radius to allow it to seat properly on the crown? If the crown race is seated part way up the curved transition it's going to be trying to expand every time you put downward pressure on it and eventually it'll crack. 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! 2 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.