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


Chain Line Question
#1
How do i know the proper spacing for the bottom bracket to have the proper chain line for a mountain bike triple crank and nine speed cassette?

Thanks, i hope some one can give the learning on this one.
  Reply
#2
Hi Dos,
Try watching this and see if it helps....
http://bikeride.com/calculate-chain-length/

If this is not it come back and we can still help ya out.
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
  Reply
#3
Sheldon Brown "chainline":-
http://www.sheldonbrown.com/gloss_ch.html#chainline

The chainset can be moved in or out a bit with limitations.
You need to check the front derailleur chainline "dimension".
(If Shimano, then see their appropriate tech' document.)
If the chainrings are to far out then the FD won't reach the outer ring.

If the bottom bracket is to short then the inner ring may catch the chainstay.

If buying a new chainset then there may be a recommended BB dimension with it.
Another possible problem, if the chainset is too near the frame, is the chain will catch the outer ring with the chain on the middle ring and smallest sprocket.
Ride hard or ride home alone!
  Reply
#4
Again I learn something new lol Smile . Thanks cycler. Think I better brush up on the terminology, very very interesting on the dimensions, cool.
Good maintenance to your Bike, can make it like the wheels are, true and smooth!
  Reply
#5
Very good cyclerUK you hit the nail right on the head. I could not have said it any better my self. Books are so much help at times. :-)
My dad always told me a Sledge a matic can fix any thing.
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
8,123
01-09-2020, 11:31 PM
Last Post: Painkiller
 
7,646
10-21-2014, 08:10 AM
Last Post: cny-man
 
9,706
02-09-2014, 01:33 PM
Last Post: cny-man
 
11,585
04-29-2011, 01:45 PM
Last Post: DaveM
 
10,393
05-02-2010, 02:38 PM
Last Post: cyclerUK
 
13,396
03-17-2010, 09:34 PM
Last Post: Bill

Forum Jump:

[-]
10 Latest Posts
Post-Ride Nutrition
Today 02:06 AM
🚴‍♂️ Saddle Up for the Belgian Waffle Ri...
Today 02:03 AM
Pre Ride Food Intake
Today 12:14 AM
SAVA Explorer 6061?
Yesterday 03:31 PM
braking by reversing the pedals
Yesterday 01:00 PM
Zwift v Spin v Wahoo
04-01-2025 05:59 PM
Have you Ever Tried an Electric Bike?
04-01-2025 05:07 PM
Good Morning from SW Ohio
04-01-2025 07:32 AM
(So California) PV Dr to be closed to bi...
03-31-2025 09:14 PM
Tubeless vs. tubes: What are the pros an...
03-31-2025 08:28 AM

[-]
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. GirishH
22 posts
no avatar 2. Flowrider
19 posts
no avatar 3. meamoantonio
12 posts
no avatar 4. Jake1
11 posts
no avatar 5. enkei
9 posts