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

New: Take Part in the new April's Giveaway for a Chance to Win the Euybike S4 Pro Max ebike worth $1299


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...
Thread
Author
Replies
Views
Last Post
 
28,777
07-15-2013, 02:11 PM
Last Post: nfmisso

Forum Jump:

[-]
10 Latest Posts
2011 GT Tachyon upgrade/mod
Today 08:45 AM
Doctors are Prescribing Cycling
Yesterday 09:50 PM
What was your first bicycle?
Yesterday 09:17 PM
New Rider Here — Momo + Viribus = Ready ...
Yesterday 09:15 PM
The great thing about trikes
Yesterday 03:47 AM
New member old rider
04-22-2025 06:32 PM
Tubeless vs. tubes: What are the pros an...
04-22-2025 06:30 PM
Shoes for ingrown toenail
04-22-2025 05:13 PM
Good morning form Alberta CA
04-22-2025 12:24 PM
Let me introduce myself
04-22-2025 09:01 AM

[-]
Top 5 Posters This Month
no avatar 1. GirishH
24 posts
no avatar 2. SPINMAN
14 posts
no avatar 3. meamoantonio
13 posts
no avatar 4. Flowrider
13 posts
no avatar 5. enkei
11 posts