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


Difference in sprocket sizes
#1
Hello,
I want to change my 7 speed freewheel sprocket. It is 13-24 and is it ok to use a 14-28 or to stick to the same size as the original.
I am new to this but am newly obsessed with bikes and my house is full of them.
Many thanks
  Reply
#2
You will "probably" be O.K. with the 14-28.
The limiting factor is the clearance between the top jockey wheel of the dérailleur and the largest sprocket. Shimano road dérailleurs are only supposed to allow a maximum sprocket size of 27 teeth.
I currently run a Sora long cage mech' on a 13-28 but it is at the very limit.
MTB dérailleurs will clear anything up to 34/36 teeth.
The "B" screw on the dérailleur is there to allow adjustment of the jockey wheel clearance.
Ride hard or ride home alone!
  Reply
#3
Note that you will reduce your top gear ratio by about 7%, that is, you will travel c20" less in top gear for every rev of the pedals, this means you will be pedaling faster going downhill.
You will also reduce the bottom gear ratio by roughly the same and will find it easier going uphill.
  Reply
#4
Hiya thanks for the replies... most helpful!
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
6,273
06-03-2022, 08:08 PM
Last Post: Zomb13k113r
 
6,070
01-02-2022, 04:53 AM
Last Post: Jesper
 
4,013
06-24-2020, 04:13 PM
Last Post: CharleyFarley
 
6,842
05-10-2020, 10:03 AM
Last Post: CharleyFarley
 
25,485
12-13-2019, 09:53 PM
Last Post: RJD
 
16,505
03-21-2016, 02:29 PM
Last Post: budstutor
 
19,766
09-16-2015, 12:42 PM
Last Post: nfmisso

Forum Jump:

[-]
10 Latest Posts
Safest bike helmets
Today 10:16 AM
The great thing about trikes
Today 10:12 AM
Tour de FRANCE 2025
Today 09:10 AM
Full Moon Ride - Sunshine Coast
Yesterday 10:46 PM
Continued learnings from bikepacking
Yesterday 10:40 PM
What are the pros and cons of using a 26...
Yesterday 10:35 PM
Cutting Drag Watts
Yesterday 03:54 PM
How often check or change mechanical dis...
Yesterday 03:24 PM
Looking for an electric bike for someone...
Yesterday 03:12 PM
Tubeless vs. tubes: What are the pros an...
Yesterday 10:44 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
23 posts
no avatar 2. Flowrider
22 posts
no avatar 3. meamoantonio
17 posts
no avatar 4. enkei
15 posts
no avatar 5. Jesper
14 posts