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


Derailleur Compatability
#1
Hi Folks,
Bit confused here about what derailleur to buy. I've just fitting a shimano MageRange Freewheel to my bike. Tooth Ratio 14-34. link here

http://www.sjscycles.co.uk/product-Shimano-Shimano-MF-TZ31-7-Speed-Mega-Range-Screw-On-Freewheel-14-34-1240.htm

and now I need a derailleur to go with it. I don't really want to spend more than £20. £30 at a push. so I've been looking for various derailleurs.
The closest I've found is this.

http://www.chainreactioncycles.com/Models.aspx?ModelID=38673

which states "For use with 28 to 34 tooth low rear sprockets, total capacity 43 teeth"

I don't really understand what this means. (A freewheel with 28-34 tooth sprockets would be slow right??) but will it be compatible with my freewheel?

alternatively, can anyone recommend a reasonably cheap derailleur or tell me how to decide whether a derailleur will be compatible with my gears. I keep hoping to see one saying "suitable for 14-34 tooth rear sprockets" but no such luck.
TIA
Dave
  Reply
#2
The Acera derailleur will be fine.
The 28 to 34T is the size of large sprocket that it's designed for.
So, for instance, 14/28 to 14/34 would be O.K.

If you wanted to run a large sprocket under 28T then you would be better of with one of the road derailleurs.

Have a look at Sheldon Browns explanation of "derailleur capacity".

http://www.sheldonbrown.com/derailleur.html
Ride hard or ride home alone!
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
10,224
05-03-2014, 05:37 PM
Last Post: limey
 
14,322
03-03-2011, 04:03 PM
Last Post: colcazal

Forum Jump:

[-]
10 Latest Posts
The deadliest U.S. counties for cyclists
Today 10:53 AM
Quiet is good
Today 10:48 AM
The great thing about trikes
Today 10:39 AM
Wearable Fitness Trackers
Yesterday 03:52 PM
Tubeless vs. tubes: What are the pros an...
Yesterday 03:33 PM
Climbing hills: Where have you found the...
Yesterday 11:48 AM
What is your favorite MTB trail/route in...
Yesterday 11:08 AM
Mental Health Warning: Recumbents May Ca...
05-24-2025 08:58 AM
braking by reversing the pedals
05-24-2025 08:52 AM
Urtopia Carbon Fold
05-23-2025 03:04 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. Flowrider
17 posts
no avatar 2. Painkiller
17 posts
no avatar 3. rydabent
13 posts
no avatar 4. meamoantonio
12 posts
no avatar 5. GirishH
11 posts