Forum home Road cycling forum Workshop

Cutting a carbon steerer tube

BrocadeBrocade Posts: 433
edited July 2010 in Workshop


  • nicklousenicklouse Posts: 81,520 Lives Here
    a nice fine tooth hacksaw blade is the best. would not use anything else.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • AlexkfAlexkf Posts: 10
    32tpi hacksaw blade is the tool of choice
  • keef66keef66 Posts: 13,123
    I have only ever used that kind of cutter on metal tubes. I'd be worried that it might crush a carbon steerer.
  • sheffsimonsheffsimon Posts: 1,282
    That tool is OK for metal - same as a plumbers pipe cutter, no good for carbon.

    Hacksaw blade is the tool of choice.
  • BrocadeBrocade Posts: 433
    OK many thanks all, think I'll just take it to a LBS after all !
    BMC Pro Machine
    Enigma Ego
  • will3will3 Posts: 2,173
    Do not whatever you do use that for cutting carbon.
  • redddraggonredddraggon Posts: 10,862
    Brocade wrote:
    OK many thanks all, think I'll just take it to a LBS after all !

    It's cheaper to just buy a 32tpi hacksaw blade, probably quicker and less agro too.
    I like bikes...

  • Brian-McBrian-Mc Posts: 71
    one of these and a decent hacksaw blade. ... elID=10222
  • VelonutterVelonutter Posts: 2,437 Lives Here
    Brian-Mc wrote:
    one of these and a decent hacksaw blade. ... elID=10222

    Yep I have one of those bought from Parker's, its the only thing I would ever use on a steerer.
  • sheffsimonsheffsimon Posts: 1,282
    Brian-Mc wrote:
    one of these and a decent hacksaw blade. ... elID=10222

    £18 to get a square cut on a tube!!

    Doesnt matter if its not exactly square.
  • Butterd2Butterd2 Posts: 937
    To get a square cut just wrap a piece of paper with a straight edge around the tube. With the paper wrapped flat against the tube the edge will be square to the tube and you can mark that and cut with a saw.
    Scott CR-1 (FCN 4)
    Pace RC200 FG Conversion (FCN 5)
    Giant Trance X

    My collection of Cols
  • stokey1964stokey1964 Posts: 454
    Just use an old headset spacer and tape it to the tube.

    Use the edge of this as your guide

  • MrIPMrIP Posts: 91
    I always use a large cable tie as a cutting guide


  • chriskemptonchriskempton Posts: 1,245
    I tried cutting down the gap between two old stems clamped to the steerer. It didn't work :lol:
  • psychlepsychle Posts: 83
    I tried using a jubilee clip for a guide, also didn't work, but as SheffSimon said, it doesn't matter if the cut isn't precisely square.

    With a carbon steerer you have to insert a fork bung. This self-positions itself relative to the axis of the steerer, not the end cut. And the top of the bung (or at least, on the one I used) sits proud of the end of the steerer.

    Otherwise, as others have said, a new 32tpi blade gives a clean cut. Worth using a dust mask also.

    "Like a pig towing a cart-load of sausages - I draw my own conclusions"
  • TommyEssTommyEss Posts: 1,855
    Don't forget to wear a good mask - carbon fibre particles in your lungs are very dangerous - carcinogenic if I remember correctly (not delibrately trying to scare-monger!)
    Cannondale Synapse 105, Giant Defy 3, Giant Omnium, Giant Trance X2, EMC R1.0, Ridgeback Platinum, On One Il Pompino...
  • gkerr4gkerr4 Posts: 3,408
    going against the grain I prefer a harsher cutting blade than a 32tpi hacksaw - with a hacksaw you are gnawing away at the carbon steerer for ages - increasing the chances of going "off" with the cut - a harsher bladecuts through it in many less strokes and then neaten up the cut with a file.

    do wear a mask!
  • thel33terthel33ter Posts: 2,684
    I used a hacksaw, but I tried a little pipe cutter thing like that on the bit I cut off and it was fine, if you take your time and only turn it in a little bit every time its won't crush it.
    And now you know, and knowing is half the battle
    05 Spesh Enduro Expert
    05 Trek 1000 Custom build
    Speedily Singular Thingy
Sign In or Register to comment.