Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

12 speed rear derail on 10 speed cassette/shifter?

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

12 speed rear derail on 10 speed cassette/shifter?

Old 09-09-19, 02:18 PM
  #1  
jzsoup
Senior Member
Thread Starter
 
Join Date: Oct 2008
Posts: 329
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Liked 0 Times in 0 Posts
12 speed rear derail on 10 speed cassette/shifter?

I'm paralyzed and on a handcycle that came with 3x10 drivetrain. The front shifting didn't work well (mostly due to my hand) so I converted it to 1x10 (bike came with SRAM GX). Then I needed a lower gear so I put on a 10 speed cassette from ebay with a 50 tooth low gear & added a Wolf Tooth to handle it. I've since stipped out the treads on the derailleur where the B screw goes through. A kind stranger helped me out by cutting new threads and used a larger screw so I could get home, but it's only a matter of time before this goes badly and I have to call my wife to bring my wheelchair to pick me up; and I'm sure it will be on the busiest traffic section.....

I am willing to go 1x12 but not sure about: A. my frame & wheel are old school style spline & QR. Converting to thru axle is not a possibility; but can I update the hub if I need to?
B. chainring is 36 tooth 110 bcd with 5 arms & custom crankarm attachment. I don't know if it can handle a 12 speed chain & I haven't been able to find a replacement that says it can handle the crankarms (I pedal with my arms).

In my head, the easiest solution would be to install a 12 speed NX or GX rear derail that can handle 50 tooth. Then I can get rid of the Wolf Tooth & my current 10 speed GX rear derail is gonna die anyway.

Would this ungodly set-up work???? Can a 12 speed rear derail work with a 10 speed cassette, shifter, and chain??? Thanks for any help and sorry for the long story.
Attached Images
File Type: bmp
dq8w8qlt.bmp (1.17 MB, 48 views)

Last edited by jzsoup; 09-09-19 at 02:21 PM.
jzsoup is offline  
Old 09-09-19, 03:28 PM
  #2  
dsbrantjr
Senior Member
 
dsbrantjr's Avatar
 
Join Date: Sep 2010
Location: Roswell, GA
Posts: 8,166

Bikes: '93 Trek 750, '92 Schwinn Crisscross, '93 Mongoose Alta

Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1377 Post(s)
Liked 917 Times in 637 Posts
Why don't you simply replace the existing derailleur and put the Wolf Tooth on it? Having said that, why do you think that the new, larger B screw will fail? It is not a high-stress part and should not need to be readjusted unless you install different parts and even then probably not if you change like for like.
dsbrantjr is offline  
Old 09-09-19, 10:48 PM
  #3  
jzsoup
Senior Member
Thread Starter
 
Join Date: Oct 2008
Posts: 329
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Liked 0 Times in 0 Posts
The b-screw doesnít push on the hanger now. I had to add a nut to the end of the screw so it will push against the wolf tooth at all. Iím thinking that eventually that nut is gonna vibrate out of place and the derailleur will end up jamming against the cassette & Iíll be stuck. Breakdowns werenít a big deal when I could walk; now Iím paranoid about it.

So my thought is a 12 speed derailleur that doesnít need a wolf tooth will eliminate an extra point that could go wrong. Thatís my theory anyway.
jzsoup is offline  
Old 09-10-19, 05:21 AM
  #4  
JonathanGennick 
Senior Member
 
JonathanGennick's Avatar
 
Join Date: Apr 2007
Location: Munising, Michigan, USA
Posts: 4,131

Bikes: Priority 600, Priority Continuum, Devinci Dexter

Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 685 Post(s)
Likes: 0
Liked 55 Times in 37 Posts
Originally Posted by jzsoup View Post
The b-screw doesnít push on the hanger now. I had to add a nut to the end of the screw so it will push against the wolf tooth at all. Iím thinking that eventually that nut is gonna vibrate out of place and the derailleur will end up jamming against the cassette & Iíll be stuck. .
What are those nuts called that have plastic in them to help lock them into place? One of those might give you some added security.

Going to your original question, Sunrace makes a 12-speed cassette that fits a standard Shimano hub:

https://www.jensonusa.com/Sunrace-MZ...SPEED-Cassette

Sunrace also makes an 11-speed 11-50 cassette that is claimed to work with a specific list of Shimano 11-speed derailleurs:

https://www.jensonusa.com/Sunrace-CS...Speed-Cassette

Drivetrain compatibility gives me headaches to think about, but it does like the Sunrace cassette provides a way to go 12 speed without having to change out your hub.
JonathanGennick is offline  
Old 09-10-19, 06:08 AM
  #5  
CycleryNorth81
Senior Member
 
Join Date: Jun 2014
Posts: 877

Bikes: custom Cyclery North (Chicago), Schwinn Circuit

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 350 Post(s)
Liked 202 Times in 117 Posts
Originally Posted by JonathanGennick View Post
What are those nuts called that have plastic in them to help lock them into place? One of those might give you some added security.

Going to your original question, Sunrace makes a 12-speed cassette that fits a standard Shimano hub:

https://www.jensonusa.com/Sunrace-MZ...SPEED-Cassette

Sunrace also makes an 11-speed 11-50 cassette that is claimed to work with a specific list of Shimano 11-speed derailleurs:

https://www.jensonusa.com/Sunrace-CS...Speed-Cassette

Drivetrain compatibility gives me headaches to think about, but it does like the Sunrace cassette provides a way to go 12 speed without having to change out your hub.
Nylock nut.
CycleryNorth81 is offline  
Old 09-10-19, 12:45 PM
  #6  
jzsoup
Senior Member
Thread Starter
 
Join Date: Oct 2008
Posts: 329
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Liked 0 Times in 0 Posts
The nylock nut is a good idea! Now I need to get to home depot...….
jzsoup is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
williamskg6
General Cycling Discussion
7
09-13-15 12:23 PM
bowlofsalad
General Cycling Discussion
14
04-05-13 03:37 PM
Atavar
Bicycle Mechanics
5
09-18-11 07:00 PM
oldacura
Tandem Cycling
7
07-20-10 07:07 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.