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

New: Take part in the July Giveaway for a brand new 26" Thruster® Street Style BMX Cruiser Bicycle

New product launch: WIN an innovative aeroe Spider Rear Rack


Replacing a 7-speed freewheel with a 9-speed?
#1
Is that possible without switching out the hub, and is that possible at all? I have a base shimano groupset and I'm in the process of upgrading everything (I'm switching out the crappy tourney der for altus 9-speed, cables etc), and I would really rather switch out my freewheel for a 9-speeder also. Do you think it's achievable?
  Reply
#2
(06-10-2020, 11:23 PM)Roman Fanian Wrote:  switch out my freewheel for a 9-speeder

Hi Roman,
There are a few factors determining compatibility. Most 7 speeds were freewheels, although there were some early 7 speed freehub/cassettes, but doubtful a 9 speed cassette would fit anyways). If your 7 speed is indeed a freewheel with a traditional screw-on hub and not a cassette fitted on a freehub, then you will have to replace the hub and rebuild the wheel with a freehub sized for a 9 sprocket cassette, more than likely needing new spokes due to length difference, and a narrower width chain (maybe length also). Also, the spread of the rear fork needs to be wide enough to accept a 9 speed set-up. I am not familiar with Shimano's shift compatibility concerning 7 to 9 speed indexing if you keep the 7 speed gear cluster. Hopefully, someone with experience will reply and give you more specific answers since I generally work on friction shift systems from the mid '80s and earlier. Certainly a bike shop should be able to provide to you that information. I have much newer and older parts that range decades difference in age, but most major changes came about in the very late '80s and later, much due to the evolution of mountain bikes and their designs. Really narrow chains don't work well on early freewheel (≤6 speeds) due to sprocket spacing, I can fully attest to this after trying to use them in certain instances. You may want to refer to Sheldon Brown's site concerning the changes you would like to make.

Take care,
Jesper
"I am become Death, the destroyer of bicycles." NJS
  Reply
#3
Measure the rear axle length. If it is 130mm you can use a road bike rear hub. The 9 speed MTB stuff fits the 9 speed road groups, so that could work.

I did that on an older Giant bike, 7 speed Shimano 200sl to 9 speed shimano... Deore (LX, I think). Rear hub is a Tiagra, circa... 2006?
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Front derailleur spring
Today 01:24 PM
TOMMASINI (EXPORT?) 80's
Today 01:08 PM
26" Thruster® Street Style BMX | July 20...
Today 12:18 PM
Post a photo for aeroe Spider Rear Rack
Today 03:20 AM
Biking inUtah
Yesterday 11:40 PM
BAGGI 1936(?)
Yesterday 08:14 PM
QUINTANA ROO "KILO" 1999
Yesterday 01:48 PM
QUINTANA ROO "KILO" 1999
Yesterday 11:06 AM
Taylor Phinney retires
07-10-2020 06:08 PM
Dork disc - remove it or keep it?
07-10-2020 04:12 PM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
79 posts
no avatar 2. CharleyFarley
23 posts
no avatar 3. Painkiller
13 posts
no avatar 4. Papa Dom
10 posts
no avatar 5. G_M
7 posts