Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

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.

User Tag List

Thread Tools Search this Thread
Old 02-22-11, 07:50 AM   #1
Kid A
Thread Starter
TurbineBlade's Avatar
Join Date: Aug 2009
Location: Alexandria, VA
Posts: 1,778
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
1970's miyata - rear derailleur cable routing issue.

I have an older miyata with stem shifters, a boss on the downtube to fit the cable housing, and a boss on TOP of the right chainstay to fit the RD end loop.

However! There's no plastic guide under the bottom bracket (obviously because the next housing stop is on TOP of the chainstay) and there's no brazed on, half-moon type guide above the bottom bracket - nor is there a pulley or anything.

Any ideas here? I'm not opposed to drilling the bottom bracket for a plastic cable stop, but then I'd have to deal with the boss on the chainstay.

Recommendations? I tried using a long piece of housing to route the cable over the bb and toward the chain stay, but it bends like a SOB and just doesn't seem quite right when shifting. Plus it requires zipties and looks pretty stupid.

Thanks for any help
TurbineBlade is offline   Reply With Quote
Old 02-22-11, 07:53 AM   #2
cowboy, steel horse, etc
LesterOfPuppets's Avatar
Join Date: Sep 2008
Location: Rock Springs, WY
Bikes: everywhere
Posts: 28,935
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1542 Post(s)
You'll need a guide that clamps onto the seat tube. There are two common types depending on your front derailer.

Front derailer with just a pinch bolt, but no cable stop need this type: (I haven't found any cheaper yet, surely they're out there somewhere)

Front derailer with a cable stop needs this type:
LesterOfPuppets is offline   Reply With Quote
Old 02-22-11, 10:42 AM   #3
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 34,068
Mentioned: 82 Post(s)
Tagged: 1 Thread(s)
Quoted: 2838 Post(s)
You could also mount a seat tube clamp on pulley of the type used for 3-speed internal hub cables. Anything that mounts above the bottom bracket to make a turning point for the wire will work.

BTW- many bikes of similar vintage to yours have 2 bosses, one near the base of the down tube, and one on the chainstay near the bottom bracket ans use a short section of housing to make the turn. If you see two unused bosses, that's what they're for.
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

All times are GMT -6. The time now is 11:53 PM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.