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

New: Take Part in the May's Giveaway: Win the LIVALL PikaBoost 2 E-bike Conversion Kit


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
 
10,886
04-14-2024, 07:38 PM
Last Post: Jesper
 
3,557
06-25-2019, 10:19 AM
Last Post: G_M
 
10,960
04-03-2013, 11:28 AM
Last Post: simondr70
 
20,166
02-22-2013, 05:41 PM
Last Post: 1FJEF
 
12,212
10-12-2010, 07:15 AM
Last Post: KC-Steve
 
17,351
06-18-2010, 06:32 AM
Last Post: Bill

Forum Jump:

[-]
10 Latest Posts
The great thing about trikes
Today 10:32 AM
What was your first bicycle?
Yesterday 06:25 PM
Where are you from and What is your favo...
Yesterday 06:22 PM
Effective Breathing Method I use to go u...
06-01-2025 11:50 PM
"There's been better times
06-01-2025 10:48 AM
Attack // Force tire style narrow front ...
06-01-2025 12:47 AM
First long distance ride..
05-31-2025 10:33 PM
Is anyone riding with music?
05-31-2025 10:12 PM
Great Giro
05-31-2025 09:57 PM
Rusty chain inspite of cleaning,lubing
05-31-2025 09:54 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. Criminal
18 posts
no avatar 2. GirishH
17 posts
no avatar 3. Flowrider
16 posts
no avatar 4. SPINMAN
13 posts
no avatar 5. rydabent
13 posts