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Advice for broken Nexus hub?

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Advice for broken Nexus hub?

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Old 09-10-09, 07:18 PM
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dcbrewer
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Advice for broken Nexus hub?

So, here is the story. Back in June, I ended up riding through some very deep water on my commute which resulted in getting my Nexus 8 redline hub being briefly submerged. Over the following few weeks, I noticed that the hub was not shifting as smoothly as it had previously. Well, I have 4 bikes, so I switched to one of the others and eventually took the Breezer in to be fixed in August. It took my LBS a couple of weeks before they could get to the bike, but eventually they called me to say it was done. When I went to pick it up though, it would only shift into two gears--first and fifth. I immediately returned it to them and the tech said he would look at it again. Several weeks later, they tell me that they can't fix the bike and recommend I take it to another shop. They refunded me the service fees and I figured that it would just require another shop with a bit more time to figure out. Unfortunately, the second shop couldn't figure it out either and aren't even sure if all the pieces are still there. They recommended I take it back to the first shop and demand they take care of me. Has anybody else had an experience like this? I'm interested to hear your suggestions.

Thanks.
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Old 09-10-09, 11:48 PM
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Nope but from my reading I get the impression that very few bike shops are familiar with geared hubs. Shimano offers relatively few IGH parts so normal procedure seems to be to to replace the complete internals which Shimano does list as a available assembly on their parts lists. What is the model of your hub? It should be marked on the outside housing.

Harris Cyclery or Yellow Jersey might be able to help you.
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Old 09-11-09, 06:02 AM
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Did the first LBS sell you the bike? If so that puts you in a stronger position. Contact Shimano and tell them what happened, ask them to look at the hub and say if pieces are missing. See if they will pressure the bike store. If not, does the US have small claims courts?
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Old 09-11-09, 06:43 AM
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I have a Nexus red band 8 speed hub, so I'll be following this thread with interest. I haven't had trouble with mine, but I have a similar experience with my Sturmey Archer eight speed hub, which I will share with you because I think it will serve as a good "best case scenario."

I got this XRF8 hub with a bike in May 2007. By May 2009 it had about 5300 miles on it, and was running really rough. It still worked, shifted into all gears, but shifting was difficult and the hub always felt terrible. The whole bicycle shook with vibrations coming from the hub, and it made a lot of noise when coasting. I had partially overhauled it twice, and had diagnosed a couple problems that were out of my ability to repair, mainly because I don't have all the right tools and replacement parts (bearings in cages) needed. So I brought it to a LBS where the head mechanic is the owner, a career mechanic, and he probably knows as much about bikes as anyone since Sheldon Brown (may peace be upon him). He assured me he could overhaul the hub, though it would take a week or two for him to look at it, order parts, and get it all back together. No problem, I said, I have a #2 bike.

To be clear, the bike and hub were both out of warranty (over a year since purchase), and I had not bought the bike from that shop anyway. The shop was under no obligation to do the repair, and I warned him I fully expected it to be a b**** of a job. I didn't actually expect him to take the job, but he did, and I was happy to have an expert working on it.

Well, I'll spare you the details, but the repair took five or six weeks, during which he totally destroyed my hub. During this process, he spent a lot of time on the phone with Sturmey Archer technical staff who guided him through the process. Yes, I know: WTF? I didn't ask. When I got the bike back it had a whole new wheel. He couldn't get a 28H hub so he built me a wheel with new 36H hub and rim and new spokes. Total cost to me: $120 (labor) plus tax. I don't know all the details of what this repair actually cost the shop, but I believe Sturmey Archer provided the hub gratis.

Anyway, as I said, this is no more than a "best case scenario" for you. What should you do now? I don't know, but I agree with Meanwhile: contact Shimano, tell them what happened. At the very least, get their advice.
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Old 09-11-09, 06:44 AM
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Nexus hubs don't take well to complete submersion, although recent upgrades have made them a little more impervious, if mine was ever completely under water, I would imediately disassemble and de-grease it and renew the lubrication.
If not, it could end up looking like this.
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Old 09-11-09, 06:45 AM
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The hub is the Nexus 8 red line version that comes with a Breezer Uptown 8. Unfortunately, I bought the bike used, so the original LBS doesn't have as much a stake in helping me. They do sell Civia's with the Alfine hub though, so I figured they would have experience working on these hubs. The second shop told me that they looked into ordering a replacement of the internals from Shimano, but they apparently don't make them for the redline version anymore. So, I am stuck with either fixing this somehow, or just getting a new wheel. I think that both the ideas of contacting Shimano and Harris are good places to start, though. I'll try and see what happens.
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Old 09-11-09, 06:56 AM
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No need to replace the wheel. All that has to be done is put a new set of Nexus internals into the housing - it's a quick plug and play operation. I recommend Papillon Cycles on Columbia Pike in Arlington for internal hub work. Come to think of it, I recommend Papillon for all bike work.

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Old 09-11-09, 07:09 AM
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I thought the whole point of these hubs was their bomb-proof durability. I can submerge my derailler without any of this drama...
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Old 09-11-09, 07:21 AM
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Originally Posted by Banzai View Post
I thought the whole point of these hubs was their bomb-proof durability. I can submerge my derailler without any of this drama...
Well, if your type of cycling typically involves submersion of the drive train, then I would say you are better off sticking with derailleurs.
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Old 09-11-09, 07:23 AM
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Contact Breezer. Maybe they can do something for you. If the 2nd shop noticed parts were missing, then it may be difficult to obtain them and you may have to buy a new hub.

Can take it apart yourself and look around/clean it and re-grease/oil it. Pretty much comes out of the shell as one unit and that's all the disassembly you need to do. This link is pretty good at step-by-step instructions with pics (have to register though to see the pics):
http://www.dahon.com/forum/index.php...=Nexus+8-speed

Hubstripping is good too, has waterproofing section/link:
http://hubstripping.wordpress.com/ne...ter-8-shimano/

Shimano has pdf tech manuals you can look at too and see for yourself if any 'parts are missing'.

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Old 09-11-09, 09:13 AM
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Here is the link to the Shimano Tech Tips area. They have a PDF available on Nexus disassembly and reassembly. Lots of IGH info available there.

http://bike.shimano.com/publish/cont...tech_tips.html
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Old 09-11-09, 09:51 AM
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Originally Posted by PaulH View Post
No need to replace the wheel. All that has to be done is put a new set of Nexus internals into the housing - it's a quick plug and play operation. I recommend Papillon Cycles on Columbia Pike in Arlington for internal hub work. Come to think of it, I recommend Papillon for all bike work.
I second that, best of several stores I've been to in the area.
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Old 09-11-09, 11:45 AM
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Originally Posted by PaulH View Post
No need to replace the wheel. All that has to be done is put a new set of Nexus internals into the housing - it's a quick plug and play operation. I recommend Papillon Cycles on Columbia Pike in Arlington for internal hub work. Come to think of it, I recommend Papillon for all bike work.

Paul
The one caveat here is that if his hub is a SG-8R25, the new updated internals will not work. This is a contradiction to something I erroneously posted previously here.
New generation Alfine internals will work in older generation Alfine hub shells. Not so for Nexus. I just confirmed this with one of my contacts at Shimano.
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Old 09-11-09, 02:48 PM
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Thanks for all the advice! I think a visit to Papillon Cycles is in my future.
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Old 09-12-09, 03:55 PM
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If the hub's a write off, I would try to get some wd40 in there. Maybe also leave it in the sun to be sure there's no lingering moisture. It might get freed up. Then lube it by oiling.

This may be easier said than done on an 8 speed but on a 3 speed I was able to add oil through the shifter rod bore in the axle.

If it did get rusty inside then the bearing life may have been cut back quite a bit.
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Old 09-12-09, 11:33 PM
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Originally Posted by Banzai View Post
I thought the whole point of these hubs was their bomb-proof durability. I can submerge my derailler without any of this drama...
There is no hub you can submerge with impunity nor any BB. If you submerge any of these components you pretty much have to tear them down, relube them and reassemble them. Your derailleur is hanging lower than an IGH so if all you are doing is getting it wet you wouldn't affect an IGH....if you are submerging your whole wheel you are going to have some work ahead of you and you'll probably need to deal with you BB as well.
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