niconj Posted March 15, 2014 Report Share Posted March 15, 2014 Hello, so I've got a Brother CNC stem which I bough used in this forum. I use it with a Tensile 99 bar and can't get it to be quiet + the bar slips. Here's how I've mounted it: - cleaned the clamping area and put some dynamics carbon paste on it (w/o it would slip even with higher Nm). - changed the bolts for some with a washer and greased the threads plus the head of the screws - clamped it to 5Nm Today I went out riding and it still makes this clicking noise and as I did a sidehop it made a louder click and the bar slipped a tiny bit. The bar is almost new and hasn't done this noise w/ another stem. I really like the geo of this stem but the clicking/slipping drives me nuts. Since many of you guys are using the TryAll stem, which uses the same clamping mechanism, I was wondering if any of you had these problems and if so, how you got rid of them. Thanx, Nico. Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted March 15, 2014 Report Share Posted March 15, 2014 Tighten the bolts more. Think of 5Nm more as a guide- I sure as hell have always tightened stem bolts to more than 5Nm... Quote Link to comment Share on other sites More sharing options...
niconj Posted March 15, 2014 Author Report Share Posted March 15, 2014 Tighten the bolts more. Think of 5Nm more as a guide- I sure as hell have always tightened stem bolts to more than 5Nm... I don't think, that this would solve the clicking issue and as stated at Tarty the "maximum bolt torque [is] 6Nm, over-tightening can crack the clamp". Quote Link to comment Share on other sites More sharing options...
trials hoe Posted March 15, 2014 Report Share Posted March 15, 2014 Used to have a clicky/ticky with Tt bars in a Tt stem, made the noise every time you'd shift weight forwards or backwards...clean everything and it would go away for 20min or so and start again, rubbing the ano off the contact area of the stem with some fine grit wet and dry eventually sorted mine. When my bars slipped ages ago they made a horrid noise like they'd broke (tiny scuff was all the damage) 5nm isn't very tight at all I certainly do mine up more than that, tighten it until it feels right (what I do and its been a long while since I snapped/rounded/threaded any bolts). If your bars are slipping first thing I'd try is tightening a bit more (1/4 turn at a time) and see how it fairs with that, disclaimers are there for apes that swing on bolts... Quote Link to comment Share on other sites More sharing options...
niconj Posted March 15, 2014 Author Report Share Posted March 15, 2014 Yeah I kinda know about the disclaimers but I haven't had to tighten any stem more than 4Nm in my life especially when using carbon paste. I'm not worried about stripping the bolts but rather braking my bars. I wonder if it's a problem of the bars being very shiny (I mean the finish of the bars, don't know the English word for it). With "grit" you mean sandpaper? What number would you recommend? 400? 800? Also, I was thinking of mounting TryAll Carbon bars but am afraid that these wouldn't stand the clamping mechanism of the brother stem. Quote Link to comment Share on other sites More sharing options...
trials hoe Posted March 15, 2014 Report Share Posted March 15, 2014 Yeah I get the shiny, gloss if you want to be anal about it haha. I imagined it was down to tiny bits of the ano 'wearing' in the areas in contact and the sound tiny bits of it being crushed then transmitted through parts loaded with conpession/tension giving that annoying tick sound. I doubt you could tighten an m5 bolt enough to cause alu bars to fail without it snapping/stripping. I used 1200 just as I had it to hand, anything finer than 600 will do the job. I was dubious of the design of the k2 when I first saw that (especially for carbons) but I'm sure plenty of people have and had no issues of compatibility. Never had problems with the carbons I had, went for the tighten it 'till you pull a stupid face approach albeit in a different stem and they served me well. Quote Link to comment Share on other sites More sharing options...
niconj Posted March 15, 2014 Author Report Share Posted March 15, 2014 Hm... I don't know about the anodizing part though. I can't imagine that this is really causing the issue. I've got some 800 here but will wait until maybe some other guys have responded. I'm not sure but I think that an alu/alu connection is prone to make some noise under great amount of force. Quote Link to comment Share on other sites More sharing options...
isitafox Posted March 15, 2014 Report Share Posted March 15, 2014 First ride after having Trialtech bars and stem re anodised Quote Link to comment Share on other sites More sharing options...
niconj Posted March 15, 2014 Author Report Share Posted March 15, 2014 I don't really understand your dialect. What are you saying at the end? That is the sound of your bars ... So you're saying that getting rid of the anodizing will get rid of the clicking? Quote Link to comment Share on other sites More sharing options...
isitafox Posted March 15, 2014 Report Share Posted March 15, 2014 Yeah pretty much, no matter how tight I did the bars up they slipped until I sanded the finish down. 1 Quote Link to comment Share on other sites More sharing options...
niconj Posted March 15, 2014 Author Report Share Posted March 15, 2014 until I sanded the finish down. I think it doesn't have to do with the anodizing but rather the rougher surface created when sanding it. I'll do it then and will keep you guys updated. Only thing I dunno is how to sand the inner side of the shims. Can't really reach it I mean... Quote Link to comment Share on other sites More sharing options...
dezmtber Posted March 15, 2014 Report Share Posted March 15, 2014 Some fork manufacturers use a hard anodizing process for the sliders on there suspension forks. hopefully that clears up the confusion. rough up the inside of the stem should fix your problem Quote Link to comment Share on other sites More sharing options...
Blake Posted March 15, 2014 Report Share Posted March 15, 2014 Depending on prep anodizing can be mad smooth. Sand it to bare metal you should get a better clamping surface Quote Link to comment Share on other sites More sharing options...
dave33 Posted March 15, 2014 Report Share Posted March 15, 2014 Did you use a torque Wrench to do the bolts up ? Quote Link to comment Share on other sites More sharing options...
niconj Posted March 15, 2014 Author Report Share Posted March 15, 2014 (edited) Did you use a torque Wrench to do the bolts up ? I wouldn't have been able to state the torque if I hadn't used one. I've got the Syntace. I'll try sanding it tomorrow. Edited March 15, 2014 by niconj Quote Link to comment Share on other sites More sharing options...
niconj Posted March 19, 2014 Author Report Share Posted March 19, 2014 (edited) Well, I sanded off the anodizing but it's still making that noise and this only 15mins. into the ride. I am kinda annoyed as I have cut the steerer in that stupid angle and now I can't fit any 4bolt clamping stem anymore. Are there any 150x30 that have a sloping top but a 4 bolt clamp? edit: I haven't been able to move the bars but haven't tried much either. Edited March 19, 2014 by niconj Quote Link to comment Share on other sites More sharing options...
Blake Posted March 19, 2014 Report Share Posted March 19, 2014 ZHI and a few others do. I'd say try another method with your stem though 1 Quote Link to comment Share on other sites More sharing options...
dann2707 Posted March 19, 2014 Report Share Posted March 19, 2014 Mine did it a lot on my new bike, I ended up using a nut and bolt through the bar clamp and the problem no longer exists. Quote Link to comment Share on other sites More sharing options...
niconj Posted March 19, 2014 Author Report Share Posted March 19, 2014 (edited) ZHI and a few others do. I'd say try another method with your stem though Like what? I don't really want to grease the clamping area. Mine did it a lot on my new bike, I ended up using a nut and bolt through the bar clamp and the problem no longer exists. I don't understand. Instead of using a screw only, you fixed it on the downside with a nut as well? Edited March 19, 2014 by niconj Quote Link to comment Share on other sites More sharing options...
dann2707 Posted March 19, 2014 Report Share Posted March 19, 2014 Yup. Taken this pic just now for you hot stuff. Quote Link to comment Share on other sites More sharing options...
niconj Posted March 19, 2014 Author Report Share Posted March 19, 2014 (edited) Yup. Taken this pic just now for you hot stuff. Thanks! Only you don't have the stem I'm talking about. Still, it might be my last resort. I just figured out that this time, it wasn't the clamp at the bar but the one at the steerer making noise. As I put all my weight onto the bar and then just took the shaft into my hand* and pulled it up it made a loud click. So it couldn't possibly be the clamps at the bar. I took the bolts off the stem, greased them, put a light coat of grease onto the steerer (here I'm not really afraid as there will hardly be any slipping upwards of the entire stem) and put everything together with the bolts being tightened at 6.5Nm. The clicking noise has disappeared for now but it wouldn't be the first time that it came back again after a short session. For now I'm positive though. *Please don't quote this. Edited March 19, 2014 by niconj Quote Link to comment Share on other sites More sharing options...
dezmtber Posted March 19, 2014 Report Share Posted March 19, 2014 My tryall stem used to do that on my rockman forks, the noise went when i bought some forks with a thick steerer, some echo urbans and then inspired elements Quote Link to comment Share on other sites More sharing options...
wilf Posted March 19, 2014 Report Share Posted March 19, 2014 (edited) Are you absolutely sure its the bar clamp? What forks are you running? Edit: Missed your above post. Was going to say, I had a constant creek on the front end with a practically brand new set up until I changed the shit Echo forks. Edited March 20, 2014 by wilf Quote Link to comment Share on other sites More sharing options...
niconj Posted March 20, 2014 Author Report Share Posted March 20, 2014 (edited) Are you absolutely sure its the bar clamp? What forks are you running? Edit: Missed your above post. Was going to say, I had a constant creek on the front end with a practically brand new set up until I changed the shit Echo forks. I do have Echo forks but it only started clicking, wenn I swapped the stem. Before that I didn't have any noise. I was wondering if a carbon bar would get rid of the noise (if it comes back) as there isn't metal on metal. Edited March 20, 2014 by niconj Quote Link to comment Share on other sites More sharing options...
niconj Posted March 25, 2014 Author Report Share Posted March 25, 2014 (edited) Today I've figured out that it's not the bar that is actually slipping but the clamps that move up and down. I made marks on the stem and while the bar stayed in it's position(relative to the clamps), the clamps moved up and down depending on whether I was leaning hard on the bar or pulling it. I really don't know how to counteract this as I don't want to tighten the bolts further. I have already reached more than the max torque. Shouldn't have bought a used stem... Edited March 25, 2014 by niconj Quote Link to comment Share on other sites More sharing options...
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