RD shift cable creaking, chain “rumbling” after bike gets thoroughly dusty from riding in sand

[Patrick Moore]

Yes, the rd cable creaks when shifting (Suntour barcons), and the chain (SRAM 11 speed on custom 10 sp cassette) “rumbles,” both only after ~10 or so very sandy and dusty miles. Both occurred after last week’s 21 mile sandy ride along Corrales Lateral and again, after rinsing the bike, on the homebound leg of the 13 mile rt to church and back via ditchbank roads.

Rinsing the bike off quiets both but the sounds recur again after a few more sandy miles.

I did not rinse the bike after yesterday’s ride, but I did spray a very light lube over the standard, bolt-on plastic bb cable guide, wiping off excess, but I daresay that’s not the best solution.

As to the rumbling, the chain is not rubbing on anything. The fat (80 mm edge to edge) Kelpie aluminum fender (double gauge alum, in case it matters) obviously amplifies the sound. I expect that bolting the rear fender to the underside of the rack (in place of stays), a Matthews custom with threaded boss for this purpose, increases the resonance.

Have others experienced this? Does it bother you? Were you able to eliminate the noise?

Any thoughts welcome.

This evening’s rain will compact the sand for a few days, but the surfaces will loosen again.

--

Patrick Moore

Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum

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[Ron Mc]

Wippermann NsX stainless chain and molten speedwax - nothing sticks to it, and you can hose it down.  

After 1000 mi, clean chain in mineral spirits, let it dry completely, and re-wax.  

Before I switched to MS Speedwax, ultrasonic chain cleaning would yield a teaspoon of sand and wear particles from the drivetrain.  

Afterward, only a little wax residue in the bottom of the beaker.  

 

[Steve]

A great big +1  on waxed chains. I use a different product (Squirt drip wax) but the results are the same; the chain stays grit free even after long rides of dusty dirt roads.

As for that rumble - I'm guessing you've already checked for chain & cassette wear.  How about the RD jockey wheels? I once mis-threaded a chain through the rear mech, which produced a distinct rumble. 

Can't say I've ever encountered a creaking cable, though my 20 some year old Shimano barcon recently developed one. Cured it with a liberal application of light oil.  Could your creak be due to a frayed section of the cable?

Good luck solving the mysteries. Creaks, groans and squeaks coming from somewhere on a bike drive me absolutely nuts!  I once overhauled a bottom bracket only to later determine that the source of the creak was the saddle rails. Maybe ask a friend to ride beside you to see if they're able to pinpoint the source.

[Ron Mc]

I've been spoiled with DuraAce shift cables. They don't splinter, and are fused in FEP plastic (thermoplastic teflon).  
They also come with nice ferrule guides that extend into the shift cab;e housing and protect the cable from rough edges.  

Do you think creaking is in the cable, or the RD pivots?  Boeshield is pretty good for both cleaning and lubing derailleur pivots.  

[Dan]

I have experienced RD cable creaking several times on my Appaloosa. Usually accompanied by much more force required to shift. 

I also thought it was the bb cable guide but I seem to recall that last time the problem was indeed solved by cleaning and lubing the pivots of the rear derailleur as Ron has suggested!

[Patrick Moore]

Thanks, Ron, Steve, and Dan.

Chain: the chain is a modestly-priced SRAM 11 speed and it was waxed using Molten Speed Wax (I shudder every time I say this name) just about exactly 110 miles ago. I generally get 200 to 400 miles between waxings before the chain gets very noisy, and again, it’s only when doing more miles in deeper sand that I have the “rumbling” problem. Do you think that spending more on a Wipperman NsX ss chain would help?

No, it’s not chain threading thru the derailleur cage; that produces a considerably louder and more “rasply” sound.

Creaking: I think it’s the cable, as when I spritzed the plastic guide with a light lubricant the sound stopped. Yes, when the creaking sound was present, I could feel resistance to lever movement. The RD pivots were lubed when I waxed the chain, 110 miles ago, but I will lube them again.

The rd cable is sound, not frayed.

Perhaps worth spending for the Dura Ace cables?

Will be grateful for any further ideas.

[Ron Mc]

Hi Bert, at one point in the past, I bought a Wippermann Connex 8SE chain because it was available and cheap.  

I ended up not using it, because I found the 8sX from BikeInn with a Challenge Strada tire order.  

Recently I used it to build and proof-ride my RoadUno.  When I found my 8sX onshore for $59 (Canitoe Road Cyclery), it was a no-brainer purchase.  

I just checked, they have 11sX for $80.  

On 6 bikes, I've never replaced one of these chains, and several are past 20,000 mi