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

New: Take Part in the March Giveaway: Coming Soon 3/24


Replacing old rear derailleur
#1
I bought a very old Mongoose mtn bike from Goodwill for commuting to/from the metro station, and would like to replace its very old Suntour 3000 alpha rear derailleur.  Is there a model of derailleur I'm likely to find that will allow me to keep the index shifting?  Or should I give up and buy any old other derailleur for continuous shifting?
Thanks!
  Reply
#2
(05-12-2015, 11:36 PM)eab Wrote:  I bought a very old Mongoose mtn bike from Goodwill for commuting to/from the metro station, and would like to replace its very old Suntour 3000 alpha rear derailleur.  Is there a model of derailleur I'm likely to find that will allow me to keep the index shifting?  Or should I give up and buy any old other derailleur for continuous shifting?
Thanks!

Hi eab.
I cannot help you, as it's over my head, other then to suggest you phone a bike shop or message Shimano through their web site.
"Where ever we go, there we are"
  Reply
#3
To have indexing, you are MOST likely going to have to replace the freewheel, RD and the shifter.  If 8 speed or less, a new freewheel, a Shimano TX35 (with or without hanger depending on what your bike needs) and SRAM MRX shifters will get you going.  Sunrace offers similar shifters, that I like better than the SRAM, a bit harder to find.
Nigel
  Reply
#4
(05-13-2015, 08:09 PM)nfmisso Wrote:  To have indexing, you are MOST likely going to have to replace the freewheel, RD and the shifter.  If 8 speed or less, a new freewheel, a Shimano TX35 (with or without hanger depending on what your bike needs) and SRAM MRX shifters will get you going.  Sunrace offers similar shifters, that I like better than the SRAM, a bit harder to find.

He says he wants to "keep" the index shifting, so maybe it is currently indexed? If so, I think a standard Shimano or Shimano compatible RD will probably work with old Suntour indexed stuff. But maybe someone know for sure.

To the OP, is it 6-speed indexed?
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Santini fluted frame
Today 01:52 AM
2010 Specialized Hardrock
03-26-2024 09:16 PM
1990 Specialized Rockhopper How to Fluff...
03-25-2024 07:05 PM
Thread busted on right pedal crank
03-24-2024 08:52 PM
Trek domane tyre
03-24-2024 05:48 PM
Modern rims crack at spoke holes
03-24-2024 05:32 PM
Cup & Cone — Simple & Durable or PITA & ...
03-24-2024 04:53 PM
Falling back
03-24-2024 04:45 PM
Derailluer Hanger Alignment Tool
03-24-2024 02:51 PM
Chain sits on top of chainring when shif...
03-24-2024 02:41 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. Painkiller
20 posts
no avatar 2. ReapThaWhirlwind
16 posts
no avatar 3. meamoantonio
15 posts
no avatar 4. GirishH
15 posts
no avatar 5. Jesper
15 posts