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


Go Back   > >

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-27-09, 02:18 PM   #1
VintageVdub
Junior Member
Thread Starter
 
Join Date: Aug 2009
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Downtube Shifter Question

I have a 87 Cannondale that I almost finished getting back onto the road, and have hit a snag.

I got the bike with an 8 speed cog on the rear which I want to upgrade to a 9 speed in the near future. The snag that I am currently dealing with is that the Suntour downtube shifters that are currently on the bike, is a 7 speed index shifter. I am currently running a 7 speed rear cog so that I can at least putt around on it, but the spacing is off and it doesnt ride "well".

I have looked around and the only person that I have been able to find (so far) that sells 9 speed capable downtube shifters are the Dura Ace ones by Shimano. Those exact ones are a little steep for my budget and was wondering if anyone else knew of others that made them/and maybe could hook me up with a model number so that I can futher my search.

Thanks for your time.
Bret
VintageVdub is offline   Reply With Quote
Old 09-27-09, 02:30 PM   #2
Oldpeddaller
Senior Member
 
Oldpeddaller's Avatar
 
Join Date: Apr 2008
Location: Maidstone, Kent, England
Bikes: 1970 Holdsworth Mistral, Vitus 979, Colnago Primavera, Corratec Hydracarbon, Massi MegaTeam, 1935 Claud Butler Super Velo, Carrera Virtuoso, Viner, 1953 Claud Butler Silver Jubilee, 1954 Holdsworth Typhoon, 1966 Claud Butler Olympic Road, 1982 Claud
Posts: 2,618
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Why not put a simple friction lever or a non-indexed ratcheting Suntour Powershift lever on the right hand side? This will handle any number of gears, you just adjust the travel stop screws on the RD to allow or limit the RD's travel. This would permit you to use 5,6,7,8 or 9 sprockets and to change between rear wheels with a different number of sprockets as often as you like. It's what I've done on a few of my bikes and I actually prefer friction shifting, it seems more satisfying somehow!
Oldpeddaller is offline   Reply With Quote
Old 09-27-09, 04:27 PM   #3
canopus 
Senior Member
 
canopus's Avatar
 
Join Date: Mar 2009
Location: Kingwood, TX
Bikes: 1985 Cannondale SR300, 1985 Cannondale ST400, 1984 Trek 760, 1984 Trek 610, 1984 Trek 720, 1981 Trek 710, 1979 Trek 710, Gary Littlejohn Cruiser, BMX
Posts: 1,218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You'll probably have to go friction but you will need to find some levers that move enough cable for your derailleur probably. I went with a new campy centaur rear and a 7 speed on my 85 cannondale but with older campagnolo downtube friction levers. I have just enough throw to cover the 7 speed. I would have to come up with something different if I tried to go 8 spd or more. My question is what are you running for hub spacing? weren't 87's spaced at 126mm? I wouldn't recommend spreading the frame on those...
canopus is offline   Reply With Quote
Old 09-27-09, 07:01 PM   #4
rccardr 
aka: Dr. Cannondale
 
rccardr's Avatar
 
Join Date: Jul 2009
Bikes: I'd rather not count how many, thank you
Posts: 3,113
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 56 Post(s)
Quote:
My question is what are you running for hub spacing? weren't 87's spaced at 126mm? I wouldn't recommend spreading the frame on those...
I too am curious as to the rear spacing on your 'Dale. If it came with an 8 speed (freewheel?) then it must have been spread somewhat. But I would also be a little hesitant to spread that 126 all the way to 9 speed territory.

The original Suntour 6 speed DT shifter will work fine with the spacing on a Shimano/Sachs 7 speed FW- the limit screws will act as the bottom 'index' and the index/cog spacing weirdness between Suntour and Shimano is all resolved with the difference between 6 speed ST and 7 speed SH. You can always go to a triple front if you need more gear. But curious as to which model this is...
rccardr is offline   Reply With Quote
Old 09-27-09, 11:49 PM   #5
VintageVdub
Junior Member
Thread Starter
 
Join Date: Aug 2009
Bikes:
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have no idea what model the Cannondale is, when I got it, it was a parts bike thrown together. The frame had been stripped and spray painted white, so I went to strip it down to the alum. and polish it out.

I didnt do the spacing myself. My LBS did the work, but he just put spacers on the rear hub of the rim (I am a newb so sorry if my lingo isnt correct) to make the 7 speed cog fit. It came with an 8 speed when I got it, and the rear derailer seemed to work fine, but he insisted that it didnt work correctly and that I needed to upgrade to a 9speed downtube shifter. But if I can use it as friction like the front derailer then I dont know what the hold up is.
VintageVdub is offline   Reply With Quote
Old 09-28-09, 07:34 AM   #6
Ex Pres
#39
 
Ex Pres's Avatar
 
Join Date: Dec 2007
Location: the 35223 (AL)
Bikes:
Posts: 6,279
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Or if you really like indexed, there are 8s DT shifters around for less than the DAs. 8s almost as many as 9.
Ex Pres is offline   Reply With Quote
Old 09-28-09, 09:40 AM   #7
Bianchigirll 
Bianchi Goddess
 
Bianchigirll's Avatar
 
Join Date: Apr 2009
Location: Camp Hill, PA
Bikes: Too many to list here check my signature.
Posts: 22,536
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 47 Post(s)
I am pretty sure the DA shifters are all you will find in 9spd. I am sorry you can only 'putt around' on that old 7spd bike. 7 seemed good enough when we upgraded from 6 LOL. why does the bike not shift well with the 7spd? are you using the Suntour DT shifter with a shimano cassette or freewheel? if most of your rear wheels are shimano 7 spd just find some shimano 7spd shifters and stick with it.
__________________
Bianchis '87 Sport SX, '90 Proto, '90 Campione del Fausto Giamondi Specialisma Italiano Mundo, '91 Boarala 'cross, '93 Project 3, '86 Volpe, '97 Ti Megatube, , '90 something Vento 603,

Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '09 Motobecane SOLD, '?? Jane Doe (still on the drawing board), '90ish Haro Escape
Bianchigirll is offline   Reply With Quote
Old 09-28-09, 09:47 AM   #8
Hydrated
Reeks of aged cotton duck
 
Hydrated's Avatar
 
Join Date: Oct 2007
Location: Middle Georgia, USA
Bikes: 2008 Kogswell PR mkII, 1976 Raleigh Professional, 1996 Serotta Atlanta, 1984 Trek 520, 1979 Raleigh Comp GS, 1995 Trek 950, 1979 Raleigh DL-1 Tourist
Posts: 1,175
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by rccardr View Post
But I would also be a little hesitant to spread that 126 all the way to 9 speed territory.
No biggie. As a matter of fact, I wouldn't even worry about actually spreading the frame. Just shoehorn the hub in there... it's only 4mm. 9 speed is only 130mm... just like all of the other ones.
Hydrated is offline   Reply With Quote
Old 09-28-09, 09:51 AM   #9
Homebrew01
Super Moderator
 
Homebrew01's Avatar
 
Join Date: Jul 2004
Location: Ffld Cnty Connecticut
Bikes: Old Steelies I made, Old Cannondales
Posts: 19,841
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 184 Post(s)
Do your existing shifters have a friction mode ? Some do. That will get you going for free.
Many of us put 130 mm wheels into old Cannondales without a problem. You just have to put a little muscle into opening the frame 4 mm when inserting the wheel. Not a big deal. Don't try to "cold set" aluminum though (permanently bending it to 130mm)
__________________
Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike
Homebrew01 is offline   Reply With Quote
Reply


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 09:53 PM.