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

New: Take part in the February Giveaway for a Reflective Backpack & Spine Protector from RiderBag


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...

Forum Jump:

[-]
10 Latest Posts
PROPER HYDRATION WARNING!!!!
Yesterday 11:22 PM
How to stay safe while biking?
Yesterday 09:10 AM
need help
Yesterday 03:53 AM
Is Presta valve lock nut useful?
Yesterday 01:11 AM
What size bike should I get?
03-05-2021 03:44 PM
Fausto Coppi Gilco frameset
03-04-2021 10:23 PM
Freehub body change compatibility
03-04-2021 12:17 PM
What kind of frame do I have here?
03-03-2021 01:07 PM
Sensah Empire road groupset
03-03-2021 08:47 AM
In need of a Hybrid of Road bike for com...
03-03-2021 08:40 AM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
17 posts
no avatar 2. Painkiller
9 posts
no avatar 3. ILv2MTB
7 posts
no avatar 4. Criminal
7 posts
no avatar 5. JoJoJo
4 posts