How many have broken Shimano Nexus 8 hubs?
#1
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How many have broken Shimano Nexus 8 hubs?
After bragging for nearly 4 years, that these were "pretty much bulletproof" hubs. I broke one. The long story is here:
https://simplecycle-marc.blogspot.com...black-box.html
but how many people have really worn one of these out?
Marc
https://simplecycle-marc.blogspot.com...black-box.html
but how many people have really worn one of these out?
Marc
#3
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I haven't broken any of mine yet. I have several old Sturmey Archer AW hubs and have yet to break any of those either, and at least one of them is pushing the 40,000 mile mark after nearly 40 years of steady use.
Aaron
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Webshots is bailing out, if you find any of my posts with corrupt picture files and want to see them corrected please let me know. :(
ISO: A late 1980's Giant Iguana MTB frameset (or complete bike) 23" Red with yellow graphics.
"Cycling should be a way of life, not a hobby.
RIDE, YOU FOOL, RIDE!"_Nicodemus
"Steel: nearly a thousand years of metallurgical development
Aluminum: barely a hundred
Which one would you rather have under your butt at 30mph?"_krazygluon
#4
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I have been commuting with mine for over 2 years. Annually I take it in and have it cleaned and new oil. San Diego weather isn't much of a test, however I do have some weight on the bike in addition to my 195 lbs. I think if it did break, I would invest in the 11 speed.
#5
Bicycle Repair Man !!!
The Girl had an early Nexus 8 (2007) and it blew up after 10,000 miles... it was around this time that Shimano changed their tech documents to indicate that these hubs need to be serviced at 1000 miles and serviced regularly and have also improved their seals.
My friend has an early Nexus 8 on his 2008 bicycle and it too is not operating properly.
The later models seem to be much better but have yet to see them last as well as the SA AW... they are a much more complex hub and as such are going to be more prone to troubles.
My friend has an early Nexus 8 on his 2008 bicycle and it too is not operating properly.
The later models seem to be much better but have yet to see them last as well as the SA AW... they are a much more complex hub and as such are going to be more prone to troubles.
#6
Senior Member
Thread Starter
The Girl had an early Nexus 8 (2007) and it blew up after 10,000 miles... it was around this time that Shimano changed their tech documents to indicate that these hubs need to be serviced at 1000 miles and serviced regularly and have also improved their seals.
My friend has an early Nexus 8 on his 2008 bicycle and it too is not operating properly.
The later models seem to be much better but have yet to see them last as well as the SA AW... they are a much more complex hub and as such are going to be more prone to troubles.
My friend has an early Nexus 8 on his 2008 bicycle and it too is not operating properly.
The later models seem to be much better but have yet to see them last as well as the SA AW... they are a much more complex hub and as such are going to be more prone to troubles.
This was a 2007 model with about 15,000 all-weather miles behind it. I'm moving this bike to my winter "beater" so I may just go for a 3 spd. How do you think the SA hubs compare? Harris has a 3 spd nexus prebuilt wheel for 129, any opinions?
Marc
#7
Bicycle Repair Man !!!
The plus to running the SA AW is the ability to use oil lubrication and I run synthetic oil to keep my hubs running smoothly in the coldest temperatures you could imagine... my winter bike has a 1964 AWG (3 speed with dynohub) and it is nearly as smooth as my 50's era hubs.
#8
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The SA AW is about as bulletproof as it gets and the new Sunrace models may be even better than most of the late model British AW hubs... the quality of British made SA hubs started to drop off in the 60's and the best vintage hubs come from the late 40's and 50's when QC was extremely high.
The plus to running the SA AW is the ability to use oil lubrication and I run synthetic oil to keep my hubs running smoothly in the coldest temperatures you could imagine... my winter bike has a 1964 AWG (3 speed with dynohub) and it is nearly as smooth as my 50's era hubs.
The plus to running the SA AW is the ability to use oil lubrication and I run synthetic oil to keep my hubs running smoothly in the coldest temperatures you could imagine... my winter bike has a 1964 AWG (3 speed with dynohub) and it is nearly as smooth as my 50's era hubs.
Marc
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Where do you bring yours in to be serviced?
#10
Senior Member
Service is merely taking the unit whole out of the hub and dipping it in an oil bath, letting it drip overnight, reinstalling the unit. If you're comfortable taking apart a regular hub and adjusting bearing tension, you can do the Shimano 8sp service.
Supposedly, Shimano offers the complete guts as a replacement unit, but never looked into it personally, so I'm unsure if the replacement unit is real or in stock.
Supposedly, Shimano offers the complete guts as a replacement unit, but never looked into it personally, so I'm unsure if the replacement unit is real or in stock.
#11
Senior Member
Service is merely taking the unit whole out of the hub and dipping it in an oil bath, letting it drip overnight, reinstalling the unit. If you're comfortable taking apart a regular hub and adjusting bearing tension, you can do the Shimano 8sp service.
Supposedly, Shimano offers the complete guts as a replacement unit, but never looked into it personally, so I'm unsure if the replacement unit is real or in stock.
Supposedly, Shimano offers the complete guts as a replacement unit, but never looked into it personally, so I'm unsure if the replacement unit is real or in stock.
#12
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The problem lies in your flirting with the Nuvinci hub. The Nexus hub heard your chat, decided that if it was going to be replaced, why bother continuing to put up with you dragging it out into miserable weather so that you could enjoy a nice hot coffee while your hub froze it's bearings off outside.
Just curious - is it possible that water got into the hub and froze? - I could see freezing water pushing the hub apart like your photo shows.....
Just curious - is it possible that water got into the hub and froze? - I could see freezing water pushing the hub apart like your photo shows.....
#13
Senior Member
Thread Starter
The problem lies in your flirting with the Nuvinci hub. The Nexus hub heard your chat, decided that if it was going to be replaced, why bother continuing to put up with you dragging it out into miserable weather so that you could enjoy a nice hot coffee while your hub froze it's bearings off outside.
Just curious - is it possible that water got into the hub and froze? - I could see freezing water pushing the hub apart like your photo shows.....
Just curious - is it possible that water got into the hub and froze? - I could see freezing water pushing the hub apart like your photo shows.....
https://simplecycle-marc.blogspot.com...g-over-me.html
https://simplecycle-marc.blogspot.com...vinci-hub.html
It might be next week before I actually take it apart and see what happened. It might be that something came loose and compromised the seal.
Marc
#14
Senior Member
Thread Starter
This thread ain't dead--I finally took that Nexus hub apart
Well, I finally quit playing with my new toys and decided to take the Nexus hub apart.
https://simplecycle-marc.blogspot.com...nexus-hub.html
To make a long story short there is a lot of side to side play although the axle is not broken. I do see something like a retaining clip loose on the inside of the drive side seal. I suspect that is the problem, or a symptom of a larger one. The whole mechanism rotates quite freely and easily around the axle and there doesn't seem to be any contamination from water. The grease itself seems to be pretty clean, which is great after 4 years. Anybody got any experience with this?
Marc
https://simplecycle-marc.blogspot.com...nexus-hub.html
To make a long story short there is a lot of side to side play although the axle is not broken. I do see something like a retaining clip loose on the inside of the drive side seal. I suspect that is the problem, or a symptom of a larger one. The whole mechanism rotates quite freely and easily around the axle and there doesn't seem to be any contamination from water. The grease itself seems to be pretty clean, which is great after 4 years. Anybody got any experience with this?
Marc
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The Shimano theory of oil dip is to regenerate the grease, which can dry out. It is NOT to run in an oil bath (such as the SA, Rohloff and Alfine 11 hubs).
I stripped my 3 year-old Alfine 8 after lots of hard, all-weather use and about 1400 miles. The grease was still good but I dipped it and added grease to the non drive-side (adjustable) bearings.
It is noticable more efficient and runs more freely.
I used some cheap brand automatic transmission fluid and drained it for 10mins.
I stripped my 3 year-old Alfine 8 after lots of hard, all-weather use and about 1400 miles. The grease was still good but I dipped it and added grease to the non drive-side (adjustable) bearings.
It is noticable more efficient and runs more freely.
I used some cheap brand automatic transmission fluid and drained it for 10mins.
#16
Senior Member
Can you get individual parts for that thing or do you have to replace the whole "guts" as somebody else posted?
#17
Senior Member
Thread Starter
Marc
#18
Senior Member
Thread Starter
Well I took the drive side apart today and found the ball retainer and ring gear retainer clip had both broken.
https://simplecycle-marc.blogspot.com...hub-day-2.html
The question is why? I'm afraid that I will have to disassemble the rest now to be sure some other secret defect doesn't come back to haunt me.
https://simplecycle-marc.blogspot.com...hub-day-2.html
The question is why? I'm afraid that I will have to disassemble the rest now to be sure some other secret defect doesn't come back to haunt me.
#19
Senior Member
When you say "ball retainer" is it a set of caged ball bearings? I can't tell from the pictures. Heck the way my eyes have been getting I can't tell in real life a lot of times.
#20
Senior Member
Thread Starter
Yep, it's a very large ring of very small clipped ball bearings. Sorry, my photographic skills are intermittent ast best.
Marc
Marc
#21
Senior Member
Thread Starter
After several days of procrastination, I cleaned the parts I had soaking in solvent and think the problem was a broken retainer ring, which loosened the bearing ring and sent little parts scurrying about the housing. Now I will have to take the ring gear and clutch apart to make sure there aren't any trapped in there.
https://simplecycle-marc.blogspot.com...ii-deeper.html
Marc
https://simplecycle-marc.blogspot.com...ii-deeper.html
Marc
#22
Senior Member
Thread Starter
I finally got around to ordering the parts and grease, after some research, we found that they no longer produce the retaining ring that broke. Shimano offered no solution except to buy a new unit. I will, but it will be a Sturmey-Archer. Just for the record, the Nexus hub was a 2007 model.
Marc
Marc
Last edited by irwin7638; 05-12-11 at 08:06 AM.
#23
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Which model number is the hub? I can see the 8Rxx in your photo, is it an 8R25? The newer 8R31/35/36 are better sealed than the older 8R25 units. I understand your relectance to purchase another Shimano product, be sure the SA hub you replace it with is the new (w) version. The SA 8 speed was re-designed and there's lots of the older non (w) versions for cheap on the 'bay.
#24
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I'm going to find a 3spd on craigslist. That's their most reliable unit and all I really need in the winter time.
Marc
Marc