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Old 10-05-10, 09:34 PM   #1
davidaxper
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Help with Nexus 8 speed hub w/Carbon belt

I just bought a Trek Soho and it makes a plasticky clicking noise when back pedaling in mid to higher gears. It's quiet in the first 3 or 4 gears. Local bike shop tried adjusting the belt and shifter cable and it was no help. They could not figure out what the problem was. I tested another soho at the store and it was the same, only made less noise. This is my first internal hub commuter and I really don't know much about them. Thanks in advance



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Old 10-06-10, 12:52 AM   #2
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Could be the IGH gear mechanism? Even when pedalling forward, some gears in any given IGH are noisier than others, depending on how the mechanism inside the hub connects.

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Old 10-06-10, 10:12 AM   #3
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Originally Posted by davidaxper View Post
I just bought a Trek Soho and it makes a plasticky clicking noise when back pedaling in mid to higher gears. It's quiet in the first 3 or 4 gears. Local bike shop tried adjusting the belt and shifter cable and it was no help. They could not figure out what the problem was. I tested another soho at the store and it was the same, only made less noise. This is my first internal hub commuter and I really don't know much about them. Thanks in advance
Part of the "charm" of Nexus IGH hubs. You can fool around with cable tension yourself, as you ride--cable adjuster is at the shifter, turn it a quarter turn one way, shift down and back, then see if the noise is any better or worse. If worse, turn it back the other way, and then a quarter turn the other way. If better, give it another quarter turn and see if it improves further. If you don't want to do this riding on the streets, find a big empty parking lot and spend a few minutes fooling around with it. Gauge the noise in the hub against the effect it has on shifting--you could find a place where you dial out the noise, but shifting becomes worse.
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Last edited by mconlonx; 10-06-10 at 10:15 AM.
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Old 10-07-10, 07:15 AM   #4
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I had a clicking noise with my IGH after approx. 500 miles. It was due to the bottom bracket loosening, which caused my chainguard to rub--I tightened the bracket and it was fine. Note my bike's a Breezer and the chainguard is supported off the bottom bracket.

You might want to try emailing Trek tech support.

That's a great looking bike--hope you get it fixed.
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Old 10-07-10, 08:46 AM   #5
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You might want to try emailing Trek tech support.

.
Or better yet get your LBS to admit defeat and they call them.
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Old 10-07-10, 08:50 AM   #6
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Or better yet get your LBS to admit defeat and they call them.
+1

Except keep in mind that bikes make noise. If you were hoping your IGH hub would be silent, then either your LBS sold you a bill of goods, or you went into the deal with the wrong information.
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Old 10-07-10, 12:28 PM   #7
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I tried adjusting the cable while riding and it didn't help. I then made sure that the chain guard was not rubbing against the belt. Then I received a response from Trek about the issue... here is what they said:

"There are two things critical to quiet belt-drive operation; tension and alignment. You mentioned that the shop has checked the tension but they may need to adjust the rear wheel in the dropouts to make sure they have proper belt alignment. If not, it's common to hear the belt catch the edge of the plastic chain guard.

The only other Soho issue that we've run across is a creaking noise caused by friction at the rear cog/hub interface. Some of these were shipped without a coat of grease and need to be disassembled, greased, and reassembled in order to eliminate this noise."

I'll tinker with it see if I can fix it... I'll keep you updated.

By the way, I love this bike!!! I like the idea that I don't have to lube the belt, not get any brake dust on my clothes and the internal gears.
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Old 10-07-10, 04:36 PM   #8
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Update: I took the rear wheel off to inspect, and it looks like if I turn the rear cog backwards in gears 5-8 it makes a clicking noise. I looked for a service manual that shows how to take the gear hub apart and see if anything needs to be lubed... and guess what I found?

Second bullet point under notes (on left) states:

"Noise may also be generated if the crank arms are turned backward or if
the bicycle is pushed backward when the gear position is 5, 6, 7 or 8.
These occurrences are a normal result of the structure of the internal
gear shifting mechanism, and are not a sign of a malfunction."

I did some research on this forum and I found a few people complaining about a similar problem. Next time we can just show them this manual.

http://bike.shimano.com/media/techdo...9830638076.pdf

Well, at least I know how to take the wheel off if I need to fix a flat. It took me 10 minutes. This including looking around to see what needs to come off: brake torque arm, shifting cable, and torque (non turn) washers. So if I need to fix a flat on the road I will need to have with me: 2 x 15mm wrenches for axle nuts, 10mm wrench to release brake cable, pliers and a flat head screw driver driver to pull of seat shifting cable, and about 15-20 minutes total time. Definitely not as easy as a quick release cassette.

After I put everything back together the rear cog started making clicking noises of its own. Didn't want to take it apart again so I just gave it a squirt of wd 40 between the cog and the hub. The clicking noise disappeared. I really don't know what to make of this.
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Old 10-07-10, 04:58 PM   #9
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my 8 speed nexus makes a clicking noise in higher gears when pedaling backwards.

I avoid it by not pedaling backwards...

I've put about 500 miles on it and never even noticed until I read this thread and had to try.
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Old 10-07-10, 09:48 PM   #10
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+1

Except keep in mind that bikes make noise. If you were hoping your IGH hub would be silent, then either your LBS sold you a bill of goods, or you went into the deal with the wrong information.
Nope sorry, my soho is absolutely silent. Either your lbs does notn know how to adjust the hub, or it might be the bottom bracket. My lbs had to order special oil from Trek to bathe the hub.
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Old 11-04-10, 01:30 AM   #11
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Originally Posted by thdave View Post
I had a clicking noise with my IGH after approx. 500 miles. It was due to the bottom bracket loosening, which caused my chainguard to rub--I tightened the bracket and it was fine. Note my bike's a Breezer and the chainguard is supported off the bottom bracket.
I had this exact same problem with my Breezer Uptown 2009. The bottom bracket had loosened, causing a couple mm wide gap on the right which let the chainguard rattle and also made the shifting less than perfect. A trip back to the bike shop (this was after about 200 miles of total use) to get the bottom bracket tightened up did the trick.

I still notice the noise when I backpedal (it seems to be mainly in gears 5 thru 8), and rare missed shifts, but usually I can shift under load and have quiet, reliable operation.

But I find it odd that the pedals rotate forward while the bike is moving forward, if my feet are off of them (say, while pushing the bike into a parking space). Does this happen to everyone? On another bike I would expect the bearing cones were overly tight, but I don't believe the bearings are that adjustable on the Nexus hub.
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Old 11-04-10, 03:04 PM   #12
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Shimano IGH units use cup and cone bearings so they are adjustable. IIRC the procedure is covered in the manual linked to above in post 8.
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Old 04-04-11, 09:00 AM   #13
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Hi David, would you believe my Soho Belt just developed the same issue, its 6 months old, and has run about 500 miles, from gears 5 and up its clicking on freewheel, and back peddling makes more noise. I also note on up hills or into wind when resistance is evident there is a lot of noise from the rear sprocket. Did you find a solution in the end? Has your problem come back after the WD40 spray?
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