Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the August Giveaway for a brand new Street Bicycle Core Line fixed gear bike


Grinding noise when cycling
#1
I have a Giant Escape n7 which has had the rear hub cleaned and a new bottom bracket to solve the problem of a grinding noise when pedaling. I think I may have it down to the chain rubbing on the front chain wheel/guard etc (whatever they are called) it is a 2007 model 7 speed. It is not the original KMC z41 chain that came with the bike, could th replacement chain be too wide, or how can i adjust the bike so the chain doesn't rub on the guard. any ideas? please help as I the shop is too far away to take the bike in and let them take care of it.
Regards
Wayne

  Reply
#2
Did the noise start when the new bottom bracket or chain was fitted? Support the bike so that you can turn the pedals and check the bike over for the source of the noise.
Turn the bike over and rest it on the saddle and bars if you have no way of doing it upright. Check the alignment of the back wheel to make sure it's central between the chainstays.
I suppose it's possible that the wrong bottom bracket has been fitted and the chainline is out?

Ride hard or ride home alone!
  Reply
#3
Ok Thanks for that, I'll give it a try. Initially I made the mistake of taking it to Halfords and they fitted the new chain which on the receipt said bmx chain (looked too wide) they also used the wrong grease on the hub so when taking it to a shimano/giant specialist they had to special order in the bottom bracket but they felt the chain was ok. I shall try your recommendation and let you know.
Regards

  Reply
#4
BMX chain is 1/8" which is also the general width for single sprocket bikes including multispeed hubs.<br />
3/32" is the standard for derailleur systems though I'm not sure about this now with the newer 10 & 11 speeds?
The chainline on single sprocket bikes should run straight from chainring to sprocket with no kinks.

Ride hard or ride home alone!
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
8,489
04-16-2015, 03:18 AM
Last Post: eastman
 
6,023
06-14-2013, 05:17 AM
Last Post: Jonathan Hill
 
5,655
08-26-2011, 07:31 AM
Last Post: DaveM
 
12,428
03-22-2010, 06:58 AM
Last Post: Bill

Forum Jump:

[-]
10 Latest Posts
Need help with info about this Evans Cyc...
Today 03:20 PM
Back on the bike in Wales
Today 02:16 PM
State Bicycle Core Line | August 2020
Today 02:15 PM
BIKEDIRECT WAITING
Yesterday 05:05 PM
One side of V brake doesn't spring back
Yesterday 02:03 PM
From Henderson Nevada
Yesterday 01:26 PM
Replacing a front derailleur
Yesterday 10:55 AM
Putting the new bike together
Yesterday 10:18 AM
clicking new chain
08-03-2020 11:48 PM
Freewheel hub wiggling in place + Chain ...
08-03-2020 08:38 PM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
66 posts
no avatar 2. CharleyFarley
16 posts
no avatar 3. Painkiller
15 posts
no avatar 4. RoadRacer2020
7 posts
no avatar 5. Papa Dom
7 posts