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

New: Take Part in the new April's Giveaway for a Chance to Win the Euybike S4 Pro Max ebike worth $1299


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
 
10,016
04-14-2024, 07:38 PM
Last Post: Jesper
 
3,436
06-25-2019, 10:19 AM
Last Post: G_M
 
10,783
04-03-2013, 11:28 AM
Last Post: simondr70
 
19,889
02-22-2013, 05:41 PM
Last Post: 1FJEF
 
11,947
10-12-2010, 07:15 AM
Last Post: KC-Steve
 
17,059
06-18-2010, 06:32 AM
Last Post: Bill

Forum Jump:

[-]
10 Latest Posts
Good morning form Alberta CA
Today 12:24 PM
Let me introduce myself
Today 09:01 AM
Schrader vs Presta
Today 12:26 AM
Wishing you an Awesome 2025 & many fun r...
Today 12:16 AM
Pogačar's 2024 dominance
Yesterday 02:08 PM
New To The Forum
Yesterday 09:32 AM
Austin, TX Bike Lane Change
04-20-2025 11:51 AM
Tubeless vs. tubes: What are the pros an...
04-20-2025 06:41 AM
Do you have a four foot rule?
04-19-2025 02:21 PM
Paris-Roubaix
04-18-2025 06:19 PM

[-]
Top 5 Posters This Month
no avatar 1. GirishH
21 posts
no avatar 2. Flowrider
15 posts
no avatar 3. SPINMAN
14 posts
no avatar 4. meamoantonio
13 posts
no avatar 5. rydabent
10 posts