Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-27-11, 04:54 PM   #1
photogeek
Junior Member
Thread Starter
 
Join Date: Jan 2009
Location: San Francisco
Bikes: 07 Jamis Quest, old hardtail Trek mtb (beater)
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Nexus 8 internal hub feels rough pedaling in low gears

I picked up a (mostly) new public D8 last weekend from their warehouse sale. It has an 8 speed shimano nexus and horizontal dropouts, and appeared to be in great condition except for a few dents in the fenders. Public didn't have details but said most of the warehouse bikes were hardly used and just couldn't be sold as new, whatever that means.

When pedaling in gears 4 and lower, it feels rough - like something is grinding or not quite meshing properly. The roughness comes through the pedals. When I powered up a short 10% grade in gear 2 the other day, it was especially bad. Gears 5 and higher feel just fine. We have another (brand new) bike with also with a nexus 8 hub, where all 8 gears are nice and smooth, so I am pretty sure there is actually something going on with my bike.

What sort of problems could cause this, and how would I go about fixing it?
photogeek is offline   Reply With Quote
Old 08-28-11, 03:27 AM   #2
MichaelW
Senior Member
 
Join Date: Feb 2001
Location: England
Bikes:
Posts: 12,923
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
The only adjustment you can do is to use the cable tension adjuster to ensure that, in 4th gear, the yellow index markers match up.
If that dosnt solve the matter then you may want to take a peek inside and maybe give an oil dip. Its not as difficult as it sounds and if you can handle cup and cones, it will be OK.
The internals come out as one unit. Some people break them open for further cleaning up but I havent.
MichaelW is offline   Reply With Quote
Old 08-28-11, 06:55 AM   #3
tcs
Palmer
 
tcs's Avatar
 
Join Date: Mar 2007
Location: Parts unknown
Bikes:
Posts: 4,697
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
On the Nexus/Alfine 8, gears 1-4 use the super-low compounding planetary. You might try oiling it.
tcs is offline   Reply With Quote
Old 08-28-11, 09:00 AM   #4
LarDasse74
Guest
 
Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
Posts: 3,769
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My Alfine 8(very similar internals to Nexus 8) is x-tra smooth in all gears except for #1, which has a slight roughness to it. As above, make sure the two dots on the cassette joint line up perfectly when in 4th gear.

Other wise take it back to the shop/warehouse or whatever and have them look at it. It should be smooth as a baby's ass.
LarDasse74 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:06 AM.