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


Chainring bumps and holes [Solved]
#1
   

After all these years I had never observed by commuter's chainrings and the interesting shapes they have. Do these holes and "bumps" help with the chain flow or what's the purpose?
  Reply
#2
(07-19-2019, 06:58 AM)barracuda Wrote:  After all these years I had never observed by commuter's chainrings and the interesting shapes they have. Do these holes and "bumps" help with the chain flow or what's the purpose?

Exactly, those are called 'pins and ramps' and they support the upshifting. You can read about it on Sheldon Brown's page.
Autobahn
  Reply
#3
(07-19-2019, 07:56 AM)G_M Wrote:  
(07-19-2019, 06:58 AM)barracuda Wrote:  After all these years I had never observed by commuter's chainrings and the interesting shapes they have. Do these holes and "bumps" help with the chain flow or what's the purpose?

Exactly, those are called 'pins and ramps' and they support the upshifting. You can read about it on Sheldon Brown's page.

Much appreciated, thanks!
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
11,732
04-14-2024, 07:38 PM
Last Post: Jesper
 
3,668
06-25-2019, 10:19 AM
Last Post: G_M
 
11,114
04-03-2013, 11:28 AM
Last Post: simondr70
 
20,405
02-22-2013, 05:41 PM
Last Post: 1FJEF
 
12,434
10-12-2010, 07:15 AM
Last Post: KC-Steve
 
17,473
06-18-2010, 06:32 AM
Last Post: Bill

Forum Jump:

[-]
10 Latest Posts
What are your best biking places in your...
Today 04:21 AM
find a cycling buddy?
Today 03:37 AM
Hot Weather Safety
Today 03:08 AM
Gandolfi "Super" model 1985-86 racing bi...
Yesterday 10:55 PM
AI ACTION FIGURE!
Yesterday 05:07 PM
First long distance ride..
Yesterday 06:30 AM
Post-Ride Nutrition
Yesterday 01:44 AM
Hello everyone
06-22-2025 09:17 AM
How often check or change mechanical dis...
06-19-2025 08:59 PM
Pre Ride Food Intake
06-19-2025 07:22 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
20 posts
no avatar 2. Flowrider
18 posts
no avatar 3. Criminal
16 posts
no avatar 4. rydabent
15 posts
no avatar 5. SPINMAN
14 posts