Specialized Shiv noise

Discuss light weight issues concerning road bikes & parts.
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PuroScattista
Posts: 34
Joined: Thu Jul 17, 2014 7:10 pm

by PuroScattista

Hi guys- went out on a long 140km ride today and heard for the first time interesting sounds from the Shiv. The sound- a faint "knocking" without a set beat/rhythm. Where- I can only assume its from the BB. When- only when seated, but upright on the bike**** I tried replicating the sound while in the aero position and no sounds, but once upright....the knocking starts. I've heard that some guys have "glued" something in the BB area to solve the issue but as its still a new bike, fairly disappointed this has happened already and not so keen on gluing parts on such a bike. Thanks in advance for the help if you have any guidance on this! :beerchug:

by Weenie


NiFTY
Posts: 1061
Joined: Sat May 26, 2012 11:26 pm

by NiFTY

If it depends on your seating position rather than power/torque output I would think it is probably from saddle/seatpost or aerobars/headset.
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;

PuroScattista
Posts: 34
Joined: Thu Jul 17, 2014 7:10 pm

by PuroScattista

NiFTY wrote:If it depends on your seating position rather than power/torque output I would think it is probably from saddle/seatpost or aerobars/headset.

I will go through the bolts again today. Process of elimination.

mattyNor
Posts: 276
Joined: Wed Mar 19, 2014 3:18 pm

by mattyNor

From working at a shop that sold primarily specialized, we had to use gasket sealer on about 70% of our sworks frames to stop the bb cups from creaking. Sounds like you don't have this issue since you're describing it as a knock.

sharkman
Posts: 1393
Joined: Fri Jun 25, 2004 8:32 pm
Location: the Netherlands

by sharkman

+ 1 on the Specialized bb (the new SL5 has an improved bb.). The specialized advise over time went from just grease along a kind of sealer (as mentioned) to gluing in the plastic cups with a strong 2 component glue. Basically it's a crap design that needs serious measurements to stop the noises.

Other option would be Specialized seatpost that also tend to produce ticking noises (and switching it for something better seems to be the best solution).

PuroScattista
Posts: 34
Joined: Thu Jul 17, 2014 7:10 pm

by PuroScattista

Ok here's an update- All bolts are good nothing is loose, or over tightened. Now I was stumped after I reached that point and sat there and stared at the bike. Wiggling cables coming from inside the frame, etc to get ideas flowing of what could be the cause for sound. So, I went to rotate my crank backwards and while doing that and the bike rolling backwards slightly...I heard the "knocking" sound again. So I rotated the cranks backwards slowly, and lone behold there was the knocking sound I could hear while riding. Im still stumped by this, but now that I can replicate the knocking by cranking the arms backwards not only worries me, but leaves me dumbfounded again as to how much more severe this could end up being. Again thanks for all the input in advance.

PuroScattista
Posts: 34
Joined: Thu Jul 17, 2014 7:10 pm

by PuroScattista

anyone able to help on this updated issue?? Im beginning to be afraid to ride the damn thing thinking those knocks are going to break something at some point

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Pokerface07
Posts: 205
Joined: Wed Jun 06, 2012 11:43 pm

by Pokerface07

Nothing simple like chain on chain catcher, loose link in chain (missing link connector, etc). I've had knocking sounds front hat area due to these simple reasons in the past.

The BB shell is sealed so it's unlikely that another is 'rubbing' inside.

by Weenie


thisisatest
Shop Owner
Posts: 1980
Joined: Sat Jun 13, 2009 4:02 am
Location: NoVA/DC

by thisisatest

First off, Shivs don't even use the plastic OSBB cups you guys are referring to, the ones that are epoxied in. It's straight BB30, as there is an aluminum sleeve for the bearings.
If you can hear it while turning the cranks backwards with your hand, it is likely either a prematurely worn bearing or a bearing that is misaligned. A misaligned bearing will drag across the crank spindle in a sinusoidal motion. You may see wear marks on the spindle where the bearing rests, two thin lines each.
I would suggest your local shop Loctite the bearings in, as Specialized BB30 tend to have a slightly loose fit (generally a good thing). The crank spindle should be well greased, ideally installed immediately after the bearings were pressed in.
Overall, Specialized BB30 and their OSBB variant are less noisy and less problematic than most others of the same type.

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