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


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
 
10,140
05-03-2014, 05:37 PM
Last Post: limey
 
14,185
03-03-2011, 04:03 PM
Last Post: colcazal

Forum Jump:

[-]
10 Latest Posts
Unlocking speed on my e-bike.
Yesterday 01:04 PM
MTB handlebar width
Yesterday 06:25 AM
What is your favorite MTB trail/route in...
Yesterday 06:16 AM
What are the best cost effective ways to...
Yesterday 06:07 AM
Bridgestone Blouson bike.
04-26-2025 07:57 PM
Thoughts on paceline riding
04-26-2025 05:51 PM
2011 GT Tachyon upgrade/mod
04-26-2025 05:04 PM
RECOMMENDATION
04-26-2025 05:01 PM
Injury Recovery
04-26-2025 04:59 PM
1987 Tommaso Alloy lugged frame
04-26-2025 04:58 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. GirishH
22 posts
no avatar 2. enkei
16 posts
no avatar 3. Flowrider
15 posts
no avatar 4. meamoantonio
13 posts
no avatar 5. SPINMAN
12 posts