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


7 speed cassette change out 80's
#1
I have a 1989 Panasonic steel frame road bike, 7 speed. Is it possible to replace the cassette with a 9 speed on my existing wheel? Or do I need to replace the wheel in order to get the 9 speed cassette, and is this even possible on this old of frame? If this is possible, I would eventually like to update as many components as compatible. I am getting weary of downtube shifting.
  Reply
#2
I'm not 100% but I am pretty sure something fomr the 80's would be a freewheel. I'm not sure if they make a 9 speed version of that, you would need a freehub body on the wheel.
This will explain the differences = http://www.sheldonbrown.com/free-k7.html
  Reply
#3
7 speed is likely to be cassette. But you can't put 9+ on a 7 speed wheel without modifications anyway. Most likely just need to swap the freehub and add 4mm of spacers to the axle.
See: http://www.sheldonbrown.com/speeds.html & http://www.sheldonbrown.com/k7.html
You'll need to spread the frame a few mm as well, but that's no big deal. I think derailleurs will be OK, but not sure.

I think you can also still get 7 speed integrated shift/brake levers for lower end shimano (Sora?). Then you wouldn't need to change anything in the drivetrain.
  Reply
#4
If the free hub is 8/9 speed compatible you will find a spacer behind the cassette when you take it off. 8 and 9 speed cassettes are the same size 9 speed uses a narrow chain to create the space for the extra gear. I have converted a Mountain bike from 7 to 8 but my free hub was compatible and all I had to do is change the shifters and cassette to 8 speeds. If I wanted to convert to 9 speed I would have had to change much of the group set to handle the narrow gauge chain.

The reason I wanted to change was to provide a granny gear and closer ratios in the middle gears. If you hunt around e-bay for the bits you will most likely need new rear wheel or hub, cassette, rear mech, front mech and chain and chainset leavers and cables for a 9 speed to work properly. An 8 speed conversion may be possible without too much work but I doubt a 1989 rear wheel will have a compatible hub. Might pay to stick to 7 speed and finding a cassette with ratios that suit your riding.
  Reply
#5
I appreciate the replies and have already accessed some of the resources mentioned. I'll give it a try and see what I can do. May be back for more advice Smile
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post

Forum Jump:

[-]
10 Latest Posts
Hello from Europe
Today 11:00 AM
first time biker
Today 10:22 AM
M9050 cage length dimensions of SGS and ...
Today 08:18 AM
Vintage Road Bike Restoration HELP
Today 02:29 AM
Trek 2300 Vs Triban RC500 (Buy advice)
Yesterday 06:41 PM
Pedals: Clip vs. Clipless
Yesterday 05:18 PM
Aluminium frame crack
Yesterday 04:03 PM
Lance - 30 for 30
Yesterday 12:36 PM
Tube Recommendations
Yesterday 11:50 AM
Looking to purchase my 1st bike, which t...
Yesterday 10:25 AM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
23 posts
no avatar 2. CharleyFarley
21 posts
no avatar 3. Joe_W
13 posts
no avatar 4. Criminal
12 posts
no avatar 5. Sagan97
11 posts