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Trimming/Sanding Carbon Steerer

dannbodgedannbodge Posts: 1,084
edited March 2019 in Workshop
A while ago I moved my handlebars to be a lot lower than standard.
My LBS cut down the steerer tub to accommodate the new height + 5mm spacer.

Since then it was making creaking noises, so I let them check it out.
They came back with "the steerer is too long, so we've changed the 5mm spacer for a 10mm to get the correct pre-load)

They've said it's only 1-2mm too long, so I want to trim it down to go back to the 5mm spacer on top.

How is the best way to trim this 1-2mm off?
I have access to a proper bench belt sander, so could I do it with that (it's got a proper bench so I can get it 100% perpendicular)
Or does it have to be cut?

Posts

  • paulbnixpaulbnix Posts: 585
    Surely take it back to them so they can correct the mistake they made in not cutting it short enough.
    Next time cut it yourself with a hacksaw.
  • dannbodgedannbodge Posts: 1,084
    paulbnix wrote:
    Surely take it back to them so they can correct the mistake they made in not cutting it short enough.
    Next time cut it yourself with a hacksaw.

    That's miles more effort.
    I can sand it in my lunchtime (and replace the headset bearings at the same time). Taking it back to the LBS involves booking it in, taking it then collecting it again.
  • MatthewfalleMatthewfalle Posts: 17,380
    mark stem where you want to cut it

    remove good stem and spacers.

    stick an old stem so you can use it as a cutting guide where you want to cut it.

    get a hacksaw and cut it

    smooth off.

    reassemble.

    you don't even have to take the forks off if someone holds it for you.

    its just cutting a carbon tube. no need for belt sanders etc.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • AlejandrosdogAlejandrosdog Posts: 1,975
    edited March 2019
    Or stick a thin spacer on top of your stem. No cutting required, this gives you flexibility if at some point in future you fit a deeper stem (some aero stuff). You’ve also got room to move if you ever need to rise it up
  • Ben6899Ben6899 Posts: 9,675
    Wear a suitable mask.
    Ben

    Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76
    Instagram: https://www.instagram.com/ben_h_ppcc/
    Flickr: https://www.flickr.com/photos/[email protected]/
  • MatthewfalleMatthewfalle Posts: 17,380
    Ben6899 wrote:
    Wear a suitable mask.

    full Romeo 4 I'd suggest.

    then again, if doing it outside with no intention of sniffing or licking anything absolutely no reason to wear a mask. it a carbon tube.

    Romeo 4 or nothing

    #livingontheedge
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • Ben6899Ben6899 Posts: 9,675
    Ben6899 wrote:
    Wear a suitable mask.

    full Romeo 4 I'd suggest.

    then again, if doing it outside with no intention of sniffing or licking anything absolutely no reason to wear a mask. it a carbon tube.

    Romeo 4 or nothing

    #livingontheedge

    Which is worth pointing out to someone who is worried about the actual cutting process. One doesn't want to be breathing in carbon fibre dust voluntarily though.
    Ben

    Bikes: Donhou DSS4 Custom | Condor Italia RC | Gios Megalite | Dolan Preffisio | Giant Bowery '76
    Instagram: https://www.instagram.com/ben_h_ppcc/
    Flickr: https://www.flickr.com/photos/[email protected]/
  • dannbodgedannbodge Posts: 1,084
    Okay I'll give sanding it a go.

    I don't think I'll be taking enough off to actually cut it.

    I'll make sure the extraction is on and I've got a mask on
  • AlejandrosdogAlejandrosdog Posts: 1,975
    3mm is plenty to cutoff. but since you have concerns about this, leave it there and a a spacer. Plenty of pros have that set up. Next time it goes to the lbs they can rectify their mistake if you want them to still.

    Sanding is just fannying around.
  • dannbodgedannbodge Posts: 1,084
    3mm is plenty to cutoff. but since you have concerns about this, leave it there and a a spacer. Plenty of pros have that set up. Next time it goes to the lbs they can rectify their mistake if you want them to still.

    Sanding is just fannying around.

    It's only 1 or 2 that need to come off.
    I already have a spacer. I just want to go back to a 5mm rather than the 10mm that it currently has on it.
  • MatthewfalleMatthewfalle Posts: 17,380
    or just do it properly and slam it

    #PRO
    #doitproper
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • keef66keef66 Posts: 13,123
    If they needed to add 5mm to the setup to get it to work, you'll need to chop 5mm off the steerer to remove it, otherwise you'll be back where you started...

    I'd recommend sawing. Sanding 5mm off is going to put a lot of sideways strain on the very end of the steerer.
  • AlejandrosdogAlejandrosdog Posts: 1,975
    or just do it properly and slam it

    #PRO
    #doitproper


    Go pro or go home



    :lol:
  • AlejandrosdogAlejandrosdog Posts: 1,975
    err Dan, just a small point, the upper clamping point of the stem will be on the steerer tube still wont it???

    #deathtrap
  • keef66keef66 Posts: 13,123
    err Dan, just a small point, the upper clamping point of the stem will be on the steerer tube still wont it???

    #deathtrap

    Could depend on the type of steerer bung and what the manufacturers of the fork say.

    Some bungs can sit below the top of the steerer tube and have the potential to allow clamping at an unsupported point. Some manufacturers insist on a spacer above the steerer to avoid clamping the very end.

    Others like the one supplied with my CR1 sit slightly proud of the top of the steerer so it is supported internally right to the top. Scott say no spacers above the stem.
  • MatthewfalleMatthewfalle Posts: 17,380
    or just do it properly and slam it

    #PRO
    #doitproper


    Go pro or go home



    :lol:

    this x 1,000000000000000

    leaving c.5mm is just pointless. its like getting a date with TDSD but deciding to take Janet Street Porter instead.

    #goPRO
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • dannbodgedannbodge Posts: 1,084
    keef66 wrote:
    If they needed to add 5mm to the setup to get it to work, you'll need to chop 5mm off the steerer to remove it, otherwise you'll be back where you started...

    I'd recommend sawing. Sanding 5mm off is going to put a lot of sideways strain on the very end of the steerer.

    No I want to run a 5mm spacer above the stem.
    The current set up was cut slightly too long to allow me to do that with the top cap that I use, so I have to use a 10mm one.

    They said the steerer is too long to run the 5mm one (I was getting clicking and creaking issues).

    I just want to lose the 1-2mm to let me run my 5mm spacer again as the 10mm looks censored .
    err Dan, just a small point, the upper clamping point of the stem will be on the steerer tube still wont it???

    #deathtrap

    Yeah of course. I'm not silly
    There is still steerer coming out of the top of the stem (2-3mm)
  • AlejandrosdogAlejandrosdog Posts: 1,975
    Dannbodge wrote:
    keef66 wrote:
    If they needed to add 5mm to the setup to get it to work, you'll need to chop 5mm off the steerer to remove it, otherwise you'll be back where you started...

    I'd recommend sawing. Sanding 5mm off is going to put a lot of sideways strain on the very end of the steerer.

    No I want to run a 5mm spacer above the stem.
    The current set up was cut slightly too long to allow me to do that with the top cap that I use, so I have to use a 10mm one.

    They said the steerer is too long to run the 5mm one (I was getting clicking and creaking issues).

    I just want to lose the 1-2mm to let me run my 5mm spacer again as the 10mm looks censored .
    err Dan, just a small point, the upper clamping point of the stem will be on the steerer tube still wont it???

    #deathtrap

    Yeah of course. I'm not silly
    There is still steerer coming out of the top of the stem (2-3mm)

    Worth asking around here :)
  • MatthewfalleMatthewfalle Posts: 17,380
    why do you want that spacer out of interest?
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • dannbodgedannbodge Posts: 1,084
    why do you want that spacer out of interest?

    Just prefer a little spacer above the stem.

    Done it now.
    Ended up cutting it anyway as there was more poking out the top than I originally thought.
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