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

Weird 90s mtb cable routing

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.

Weird 90s mtb cable routing

Old 04-22-20, 11:14 PM
  #1  
cb400
Senior Member
Thread Starter
 
Join Date: Sep 2019
Location: BC
Posts: 61

Bikes: 1990 Rocky Mountain Hammer, 19(7?)?Le Croco, 2000 Mikado Magellan

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Likes: 0
Liked 18 Times in 12 Posts
Weird 90s Rocky Mountain mtb cable routing

Hey everyone, I picked up a 1990 rocky mountain project yesterday and having only worked on old road bikes, I'm not clear on all of this new fangled cable routing.

I was told it had all original Deore DX components, which included what appears to be a Deore DX bottom pull front derailleur. What I am confused about is that the braze-ons seem to be for a top mount derailleur. Perhaps that is why it became a project, someone ordered an incorrect part back in the day. Can anyone confirm this?

Let me know if you need better pictures, I think these will work but they're all close up



Last edited by cb400; 04-22-20 at 11:26 PM.
cb400 is offline  
Old 04-22-20, 11:23 PM
  #2  
LesterOfPuppets
cowboy, steel horse, etc
 
LesterOfPuppets's Avatar
 
Join Date: Sep 2008
Location: Valley of the Sun.
Posts: 34,347

Bikes: everywhere

Mentioned: 56 Post(s)
Tagged: 1 Thread(s)
Quoted: 5368 Post(s)
Liked 1,070 Times in 571 Posts
Is that a threaded hole I see down towards the bottom, on the aft side of the seattube? If so, it was likely fitted with a pulley to run the cable on the top tube, yet still use the bottom pull FDs of the era.
LesterOfPuppets is offline  
Old 04-22-20, 11:26 PM
  #3  
LesterOfPuppets
cowboy, steel horse, etc
 
LesterOfPuppets's Avatar
 
Join Date: Sep 2008
Location: Valley of the Sun.
Posts: 34,347

Bikes: everywhere

Mentioned: 56 Post(s)
Tagged: 1 Thread(s)
Quoted: 5368 Post(s)
Liked 1,070 Times in 571 Posts
I can't find any pics of one on an old MTB, just CX ones, where they were used for a much longer period of time.

LesterOfPuppets is offline  
Old 04-23-20, 12:34 AM
  #4  
cb400
Senior Member
Thread Starter
 
Join Date: Sep 2019
Location: BC
Posts: 61

Bikes: 1990 Rocky Mountain Hammer, 19(7?)?Le Croco, 2000 Mikado Magellan

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Likes: 0
Liked 18 Times in 12 Posts
I believe you are exactly right, I remember wondering what that weird bit was in the box of parts and I'm fairly sure it was one of those pulleys. I will check in the morning and see if I can get it set up. Thank you!
cb400 is offline  
Old 04-23-20, 08:02 AM
  #5  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 13,623

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2441 Post(s)
Liked 502 Times in 389 Posts
These ST cable reversing pulleys are a common CX thing a few years ago. As internal cable routing took over the pulleys became a Dodo bird of sorts. Not the best design on a mud intended bike but did alloy bottom pull frt ders to have TT routed cables. Andy
__________________
AndrewRStewart
Andrew R Stewart is offline  
Old 04-23-20, 08:25 AM
  #6  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 32,184

Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!

Mentioned: 35 Post(s)
Tagged: 0 Thread(s)
Quoted: 1410 Post(s)
Likes: 0
Liked 239 Times in 190 Posts
Yep, I had a '92 Trek 7000 MTB and it had the same FD cable routing and the pulley on the seat tube to actuate the bottom pull derailleur with top tube run cables.
HillRider is offline  
Old 04-23-20, 10:07 AM
  #7  
cb400
Senior Member
Thread Starter
 
Join Date: Sep 2019
Location: BC
Posts: 61

Bikes: 1990 Rocky Mountain Hammer, 19(7?)?Le Croco, 2000 Mikado Magellan

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Likes: 0
Liked 18 Times in 12 Posts

Found the bit and installed it (I took it apart and cleaned it after this picture and then threaded it all the way in). The stock shifters even seem to work okay!

Having three sets of cable braze-ons on the top tube and random bits of housing everywhere is a big change from what I'm used to. I think I got the cable positions right with a derailleur cable on each outer braze-on, and the rear brake in the middle.
cb400 is offline  
Old 04-23-20, 12:29 PM
  #8  
Wilfred Laurier
Señor Member
 
Wilfred Laurier's Avatar
 
Join Date: Feb 2013
Posts: 5,031
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 627 Post(s)
Liked 260 Times in 191 Posts
Close, but the cable is routed wrong at the derailleur pinch bolt.

Under the cable pinch bolt on those derailleurs was generally a washer with a little tab. The cable should go from the pulley, over the tab, then under the pinch bolt. THe tab and cable should both be on the side of the bolt closer to the centreline of the bike.
Wilfred Laurier is offline  
Old 04-23-20, 01:54 PM
  #9  
cb400
Senior Member
Thread Starter
 
Join Date: Sep 2019
Location: BC
Posts: 61

Bikes: 1990 Rocky Mountain Hammer, 19(7?)?Le Croco, 2000 Mikado Magellan

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Likes: 0
Liked 18 Times in 12 Posts
You are correct although the picture is deceiving, nothing was actually connected at the time. I've since connected it on the inner side. There is only an indent on the rear derailleur for the cable to be clamped into but I will be looking out for a tabbed washer in the parts box just in case. .

Last edited by cb400; 04-23-20 at 01:57 PM.
cb400 is offline  

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 © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.