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


Replacement for RM40-7 hub and cassette
#1
I'm new to bike repair. I use an old bike to ride around my neighborhood with my kids so I'm not a serious rider. My bike has a Shimano FH-RM40 7-speed hub and cassette. It's been difficult finding direct replacements for those components. Is there anything else that will fit without having to change out the entire wheel? I don't mind upgrading if the cost isn't too high. What are my options?

Thanks...
  Reply
#2
(07-14-2015, 07:32 AM)vicnation Wrote:  I'm new to bike repair. I use an old bike to ride around my neighborhood with my kids so I'm not a serious rider. My bike has a Shimano FH-RM40 7-speed hub and cassette. It's been difficult finding direct replacements for those components. Is there anything else that will fit without having to change out the entire wheel? I don't mind upgrading if the cost isn't too high. What are my options?

Thanks...

Here a drawing if that helps. It should be serviceable.
http://www.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FH/EV-FH-RM40-7NT-1590A_v1_m56577569830608949.pdf
"Where ever we go, there we are"
  Reply
#3
What EXACTLY is the problem?

You can get a 7 speed freehub that will fit:
http://www.niagaracycle.com/categories/shimano-fh-rm30-7-speed-freehub-body

Lots of 7 speed cassette options:
http://www.niagaracycle.com/categories/components/drive-train/cassettes/7-speed

If you replace your cassette, you need to replace your chain.  I like the KMC X8.93 for my 7 and 8 speed applications.

It is easy to replace the ball bearings in the hub (not freehub), and as long as it is not too far gone, with regular servicing, the hub will last more than our lifetimes.
Nigel
  Reply
#4
(07-14-2015, 05:25 PM)nfmisso Wrote:  What EXACTLY is the problem?

You can get a 7 speed freehub that will fit:
http://www.niagaracycle.com/categories/shimano-fh-rm30-7-speed-freehub-body

Lots of 7 speed cassette options:
http://www.niagaracycle.com/categories/components/drive-train/cassettes/7-speed

If you replace your cassette, you need to replace your chain.  I like the KMC X8.93 for my 7 and 8 speed applications.

It is easy to replace the ball bearings in the hub (not freehub), and as long as it is not too far gone, with regular servicing, the hub will last more than our lifetimes.

Thanks...

The bike shifts up and down constantly and will not maintain a gear. Some of the teeth on the cassette look damaged. I haven't found any slippage in the gearing. If I need to replace the cassette, is there an upgrade available over what I have where I won't have to replace the hub?
  Reply
#5
"The bike shifts up and down constantly and will not maintain a gear."

Most likely the cable needs adjustment due to stretching.  

Other possibilities:
* shifters
* cable friction - replace and properly lubricate.
* damaged cassette - always replace the chain when you replace the cassette.

Does not sound like anything related to the freehub.
Nigel
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
26" Thruster® Street Style BMX | July 20...
Today 09:28 AM
COLSON TANDEM BIKE REAR STEERING
Today 08:44 AM
Work Table For Wheels
Today 08:29 AM
1980 Schwinn Suburban
Yesterday 11:06 PM
Need help finding a new rear derailleur
Yesterday 03:33 PM
Pain from bike saddle.
Yesterday 07:27 AM
Pinging noise fixed
07-02-2020 09:02 PM
road bike purchase help please
07-02-2020 12:27 PM
Saddle Height
07-02-2020 09:50 AM
What would be a fair price for this?
07-02-2020 02:54 AM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
58 posts
no avatar 2. Painkiller
18 posts
no avatar 3. CharleyFarley
15 posts
no avatar 4. Joe_W
11 posts
no avatar 5. Papa Dom
11 posts