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

New: Take Part in the May Giveaway for a Change to Win the Thruster 27.5 Retrograde BMX Cruiser Bike


Hi, newbie needing help
#1
Hi all, Many thanks in advance by the way lol

Right, i'm newly single after going through divorce and trying to stand on my own two feet and re-build my own bike by myself, which i have never been allowed to do before now.

Until now i've been doing ok, but have now come a little stuck, My chain ring is bent and when i change gears the chain jumps off my chain ring. Ok I realise that I need to replace my chain ring, but this is where i'm scratching my head. How do I know how to get the right size, is it diameter, or counting the cogs (?) round the outside.
  Reply
#2
Sometimes difficult to change one crank in a crankset. It depends upon what you have. Number of teeth is how they are sized and then you have to match the bolt circle diameter to the crankset.
Google crankset BCD and check Wiki or Sheldon Browns website for information.
  Reply
#3
Hi Gypsylass;

Here are some links:
http://www.sheldonbrown.com/cribsheet-bcd.html
http://sheldonbrown.com/straighten-chw.html

If you share a picture of your bike and chainrings, we can provide much better advice. It may be cheaper to replace than repair, depending on what you have.

A picture like this:
http://s211.photobucket.com/albums/bb8/dianemisso/blue10072011/?action=view&current=IMG_0716.jpg
and this:
http://s211.photobucket.com/albums/bb8/dianemisso/Nigels%20Wheels%20042311%20A/Nigels%20Wheels%20042311%20B/?action=view&current=IMG_0450.jpg

Should provide almost all the information needed. And do count the number of teeth on each chainring.

If you are close to one of us, feel free to PM us for help.
Nigel
  Reply
#4
(07-10-2011, 02:04 PM)RBurrelli Wrote:  Sometimes difficult to change one crank in a crankset. It depends upon what you have. Number of teeth is how they are sized and then you have to match the bolt circle diameter to the crankset.
Google crankset BCD and check Wiki or Sheldon Browns website for information.

Wow thanks for that, had a look although most of it is going right over my head right now lol, however i'll keep looking at it and maybe it'll sink in one day.
Quote:If you share a picture of your bike and chainrings, we can provide much better advice. It may be cheaper to replace than repair, depending on what you have.

Again thanks, I'll get some pics sorted as soon as.
Gypsylass

rebuilding my bike is a bit like life, I'm learning by my mistakes
  Reply
#5
Oooh by sheer chance i managed to figure that all out, 46T chain ring, single sprocket, 3/32" chain....oooh i sound like i know what i'm talking about now. not! Getting one off ebay, so hopefully that sorted.

Gonna add a photo, been advised to replace bottom bracket too, no idea where to start with that one, so, remembering what you said, this is what i'm looking at while i'm scratching my head.

ok hang on, gotta shrink pic as it's too big....
Gypsylass

rebuilding my bike is a bit like life, I'm learning by my mistakes
  Reply


Forum Jump:

[-]
10 Latest Posts
Happy Fathers Day
Yesterday 12:47 AM
What are your best tips for long rides?
Yesterday 12:45 AM
Great CHEAP winter gloves (AKA This one ...
06-15-2024 10:35 AM
YABD - vintage Bernard Carré frame, etc
06-15-2024 01:11 AM
Forgot to introduce myself!
06-14-2024 11:07 AM
Fat bikes for ever..
06-13-2024 01:12 PM
Adding brake to kids balance bike
06-12-2024 11:06 PM
Classic MTB: Kirk Revolution DC magnesiu...
06-11-2024 06:03 PM
Problem > Solution
06-10-2024 09:41 PM
tried absolutely everything to fix these...
06-08-2024 04:05 PM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
41 posts
no avatar 2. enkei
26 posts
no avatar 3. Dusan
15 posts
no avatar 4. Amanda_W
12 posts
no avatar 5. meamoantonio
9 posts