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

New: Take part in the September Giveaway for Vvolt Sirius E-bike valued at $2999


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
Please allow me to introduce myself
Yesterday 03:21 PM
What are your best biking places in your...
10-03-2022 10:00 PM
650B vs 650C which one is perfect for mo...
10-03-2022 09:54 PM
Schwinn Le Tour sagging chain
10-03-2022 09:06 PM
What was your first bicycle?
10-03-2022 08:21 AM
bike riding is a fun! isn't it ???
10-01-2022 02:16 PM
Campagnolo Freehub Lockrings
10-01-2022 05:13 AM
Biking and running apps
09-30-2022 08:27 PM
Newbie
09-30-2022 08:20 PM
Campy 10 speed cassettes
09-30-2022 09:53 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. Jesper
21 posts
no avatar 2. ichitan
15 posts
no avatar 3. ReapThaWhirlwind
6 posts
no avatar 4. jasmin122
4 posts
no avatar 5. Derrick
3 posts