Trouble with Schmolke TLO compact slipping in MCFK stem

Discuss light weight issues concerning road bikes & parts.
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dereksmalls
Posts: 2042
Joined: Tue Aug 02, 2011 9:20 pm
Location: New Zealand

by dereksmalls

Has anyone else had issues with this happening? The stem face plate is a tight as it can go and up against the back mounting as much as it can be, but going over bumps it is starting to slip. I had to cancel a r ide mid ride yesterday as the bars rotated down on a bumpy downhill that it was too dangerous to carry on and I had to turn back (didn't have a minitool on me to fix!)

by Weenie


spdntrxi
Posts: 1727
Joined: Sat Jul 20, 2013 6:11 pm

by spdntrxi

using any carbon paste ? I use TACX on my MCFK stem..but I have a Ritchley Streem II bar

sychen
Posts: 287
Joined: Thu Apr 24, 2014 1:06 pm

by sychen

Don't either product but to start have you measured the bar width with calipers? Might be the tolerance of production are on the "narrow" side?
Are they both new? have you used either with another bar/stem?
Carbon Paste probably wouldn't help if your stemplate is already backed into the stem but could give it a go?
Have you removed the faceplace and checked the bar for deformation? could of crushed it and showing up as slippage. If that is the case you are very very lucky.

Have you used a torque wrench? should only be as tight as recommneded.

dereksmalls
Posts: 2042
Joined: Tue Aug 02, 2011 9:20 pm
Location: New Zealand

by dereksmalls

Thanks for the feedback. Yes using carbon paste, both are bought second hand off here. I'll investigate the possibility of the bar being crushed or deformed.

alcatraz
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Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Check the clamping area for compression damage. If the carbon in the bars has delaminated you should see a crease forming on the surface somewhere around the clamp area. If this is the case the bars can only be binned.

Happened to me once. After going to integrated bars+stem no problem. Comfy as hell too.

/a

beanbiken
Posts: 544
Joined: Tue Mar 18, 2014 10:13 pm
Location: Great Southern Land

by beanbiken

have the MCFK stem with the Schmolke SL compact bars. Zero problems with slippage etc. As per alcatraz it odes seem something is amiss.

BB
Ahhh, coffee & carbon

NiFTY
Posts: 1169
Joined: Sat May 26, 2012 11:26 pm

by NiFTY

If the bar is undersize or thestem is oversize i would try spraying the clamp area of the bar with a few coats of clear to thicken it up.
Evo 5.02kg SL3 6.77 Slice RS 8.89 viewtopic.php?f=10&t=110579" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;

beanbiken
Posts: 544
Joined: Tue Mar 18, 2014 10:13 pm
Location: Great Southern Land

by beanbiken

NiFTY wrote:
Thu Apr 19, 2018 7:35 am
If the bar is undersize or thestem is oversize i would try spraying the clamp area of the bar with a few coats of clear to thicken it up.
Yes, 2 pack auto clear would work. Your local smash repairer should be able to assist there............ Or maybe a call to MCFK or Schmolke
Ahhh, coffee & carbon

alcatraz
Posts: 1038
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Another symptom with my weirdly acting bars was that torquing the stem bolts seemed to take forever. They needed several turns before they started to tighten properly after that the plate contacted the bars.

A more confident clamping is probably when the torque increases quickly.

/a

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4ibanez
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Location: Norwich, UK
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by 4ibanez

NiFTY wrote:
Thu Apr 19, 2018 7:35 am
If the bar is undersize or thestem is oversize i would try spraying the clamp area of the bar with a few coats of clear to thicken it up.
Great advice. Maybe roughen the newly applied coating by grazing it with some lowish grade sand paper (100 or 80) as well for extra grip.

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PinaRene
Posts: 557
Joined: Mon Feb 12, 2007 12:08 pm

by PinaRene

Use 2 layers of exremely hard clear boat lacquer on the clamping area, then some 2 component boat laquer with a touch of fine sand in it ( real fine sand ) as a third layer. Then if necessary a last thin layer of clear coat. That must give some grip you need on the clamping area. Or otherwise get in contact with the manufacturer and ask what to do.

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by Weenie


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