BMC - VTown Posted August 21, 2014 Share My riding partner was chasing me down in a sprint when his stem bolts failed catastrophically at 53km/h and down he went on the tar, broken rib, collar bone and stitches in his elbow and shin, and much pain.Make sure you stick to the manufactures recommendations on the nm torque settings for these critical bolts. They range from 4 to 8 nm depending on the manufacturer specifications. Oufy MTB (Roadie) 1 Link to comment Share on other sites More sharing options...
Paul Ruinaard Posted August 21, 2014 Share Win a. Tough lesson to learn. Use a torque wrench Link to comment Share on other sites More sharing options...
Captain Fastbastard Mayhem Posted August 21, 2014 Share What stem was it, and were they Ti bolts? Link to comment Share on other sites More sharing options...
Malpiet Posted August 21, 2014 Share Very true, I seen during the argus a guys handlebar snap off clean just on the outside of the stem. I found that my bars slipped when i hit big bumps even when torque to the specified NM, removed the bars cleaned it up with degreaser and added some copper slip on the face plate and sides of and torqued it up, problem solved Always advisable to get a torque wrench IMHO Link to comment Share on other sites More sharing options...
Oufy MTB (Roadie) Posted August 21, 2014 Share stem bolts on my mtb only require 2nm, jip i think we overtighten in fear of it working loose Link to comment Share on other sites More sharing options...
Cat2forLife Posted August 21, 2014 Share Happened to me once. Also at about that speed, but luckily I was coming to the end of a descent and only one bolt snapped, so no crash. Thank goodness. All the best to your friend. Hope he heals up quick. LUZERN 1 Link to comment Share on other sites More sharing options...
Boerklong Posted August 21, 2014 Share I put a drop of lock-tite on all the bolts of my mx bike... might do the same on the fiets on bolts that needs to stay put Link to comment Share on other sites More sharing options...
BMC - VTown Posted August 21, 2014 Share It was a Deda stem on a Dogma frame, he was standing on the peddles at the time, went down real hard.Yes torque wrench is required. Link to comment Share on other sites More sharing options...
BMC - VTown Posted August 21, 2014 Share I prefer the all in one stem and bar system, carbon. Link to comment Share on other sites More sharing options...
openmind Posted August 21, 2014 Share I use carbon paste on the stem / bar interface and torque to only 2/3 of the torque spec. More than tight enough and never slips. I use carbon paste even on Al /Al interfaces - works a treat. Link to comment Share on other sites More sharing options...
Cat2forLife Posted August 21, 2014 Share It was a Deda stem on a Dogma frame, he was standing on the peddles at the time, went down real hard.Yes torque wrench is required. Mine was also a Deda stem. Maybe it's a Deda thing? Anyway, I also went for the integrated system afterwards. Got myself a FSA Plasma Link to comment Share on other sites More sharing options...
Seeker911 Posted August 21, 2014 Share Jees first time I ever heard of this happening. Yikes !! best I start using that torque wrench of mine. Link to comment Share on other sites More sharing options...
Skylark Posted August 21, 2014 Share What exactly happened? Did the heads of the stem bolts break off or did the stem itself or the faceplate have a catastrophic failure due to being over tightened? Tightening the faceplate unevenly can also crack the faceplate, I have done that on a Thomson stem before, wasn't even over tightened just unevenly. Link to comment Share on other sites More sharing options...
floatfox Posted August 21, 2014 Share Torque wrench and lock-tite..dont use red lock-tite as you will possibly need to apply heat to get the bolts loose. Use only blue. Tromp and Wolfie1 2 Link to comment Share on other sites More sharing options...
Pieterg Posted August 22, 2014 Share Eina !! Link to comment Share on other sites More sharing options...
Waynehans Posted August 22, 2014 Share At least the Guy that fell is a BIG CHOP, so he will be OK!!! HAHA... Link to comment Share on other sites More sharing options...
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