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

New: Take part in the Newton-Rider International Giveaway for a Foldable Bicycle Helmet


25 year old 6 speed shimano derailleur
#1
I have an old bike I'm trying to rehab to give away. It has a Shimano 6 speed front and rear derailleurs that has POSITION FH adjust stamped on the front. Through a square hole in the face of the derailleur you can see an adjustment screw. From the rear of the derailleur you can see another screw. There is no notation as to what function they perform. It doesn't seem to have a barrel adjuster or anything marked as high and low limit screws. The derailleur cable is secured by a hex nut rather than a hex screw. I'd like to find information regarding setting the high and low limits as well as how to adjust derailleur cable tension. The front derailler does have the limit screws marked clearly. I have images attached if anyone thinks they can help.
Thanks
Rick
  Reply
#2
At a guess, I would say that the one on the front is the high gear limit stop. Try turning it clockwise, you shold see the derailleur move slightly inwards and back outwards when you turn the screw anticlockwise.

Are the gears indexed, or are they just a friction shift? If they are just friction they don't need a barrel adjuster.

The derailleur will be in the highest gear, smallest sprocket, when there is no cable tension. So to set up the limits and the cable, first loosen the cable clamp bolt so that the cable is free, then set the high limit so that the chain runs smoothly in the highest gear, but cannot come off the smallest sprocket. Pull the cable through the clamp bolt so that its taught enough to not flap about against the frame, but not so tight that it alters the derailleur position and tighten clamp bolt. Next adjust the shifter so that the derailleur is in the lowest gear, biggest sprocket, and set the low limit so that it runs smoothly, but can't go too far and off into the spokes.
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
3,809
03-02-2014, 04:12 PM
Last Post: cny-man

Forum Jump:

[-]
10 Latest Posts
Road bike brakes upgrades
Today 03:44 AM
NewBikeShopper (intro & opinion request)
Yesterday 02:58 PM
Do you wave to other cyclists?
Yesterday 02:48 PM
Newton-Rider, a helmet like no other
01-15-2021 05:01 PM
Colnago R41 Handlebar
01-14-2021 10:24 PM
How much do you bike per year?
01-14-2021 04:50 PM
BMX Shoes
01-14-2021 04:42 PM
Colnago C64 setup advice
01-14-2021 04:26 PM
1983 Trek 720
01-13-2021 10:30 AM
Riding all day on the winter solstice
01-13-2021 07:43 AM

[-]
Top 5 Posters This Month
no avatar 1. Criminal
22 posts
no avatar 2. RollOn
5 posts
no avatar 3. Yevhen
5 posts
no avatar 4. Henry_G
5 posts
no avatar 5. NewBikeShopper
4 posts