Overtightening boo boo

Iwingstein
Iwingstein Posts: 111
edited February 2011 in MTB workshop & tech
Ok, hypothetically if a friend read the torques needed on his Specialized's rear suspension were in "lb ft" and did them up so, then realised that they should've been in "lb in" what are the chances of his a) salvaging the bolt things and b) removing them and using soemthing else as apparently they aren't available anymore.

I haven't heard of lb in myself.

Thanks and regards

Simon

PS It's not me, I have a Giant:D

Comments

  • Stuy-b
    Stuy-b Posts: 248
    As long as "he" hasn't snapped the bolts and you can get them out i cant see a problem.
  • tri-sexual
    tri-sexual Posts: 672
    edited February 2011
    hope i read this right, i apologise in advance if i misunderstood the question.
    if he did torque bolts in ft-lbs rather than in-lbs then it wont be a problem, he has under tightened the bolts, simply retorque to the right settings, no damage done.
    conversely if he tightened it in in-lb rather than ft-lbs then i expect serious damage to be made to components, cracked bolts/ crushed components etc etc but if he did do it this way round then i think he would have noticed because most parts would be breaking as he did them up
    there is a factor of 12 times between the two (in to ft)
    so
    10 in-lb = 0.8 ft-lb = 1.1NM
  • Anonymous
    Anonymous Posts: 79,667
    Depends if it was pound per foot, as the OP says it was, in which case, he's over-torqued by a factor of 12.

    A pound on the end of a lever 12 inches long will deliver 12 times the torque of a pound on the end of an inch long lever.
  • The Rookie
    The Rookie Posts: 27,812
    With YeeHaa (it happens), besides lbin and inlb are the same (as 2x3 is the same as 3x2), he may have 'got away with it' best undo, relube and retorrque correctly and then see what happens, removing the shock to check free motion would be a good idea.

    Simon
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.