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


Go Back   > >

Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-23-09, 07:22 PM   #1
woodbuda
Newbie
Thread Starter
 
Join Date: Aug 2009
Bikes:
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Index shifting for Old Schwinn Twinn?

I bought an old modified Schwinn tandem late this summer to see if we like tandeming, and the good news is that we do! The tandem we bought is a 1970 Schwinn frame to which someone added 10-speed capability. While I am able to shift without indexed shifting, it's too much for my wife and daughters, and I'm wondering if I can add index shifting to this bike.

I don't know if the rear derailleur is original -- it's a SunTour AG -- tied to a 5-gear cassette that ranges from 14 to 38 teeth. Currently there's a flat bar handlebar on the front that looks like it came from a kids BMX bike, but ideally I'd also like to upgrade that to something like my Trek hybrid. Thus grip shifting would be nice, but not necessary. One thing that might cause a few chuckles out there -- the shifters are currently mounted on the stoker's handlebar. I've never seen or heard of that before!

And here's the cherry to top it off: I can't put much money into this, so replacing the entire cassette and derailleur is not an option.

Any thoughts? Any additional info that would help?
woodbuda is offline   Reply With Quote
Old 10-23-09, 07:49 PM   #2
TeamTi700
Senior Member
 
Join Date: Feb 2006
Bikes:
Posts: 167
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
It would really help if you could post some pictures. Are you sure it's a '70? What are the first two letters of the serial number? It could be a Twinn Sport, but they didn't start to make those until 1979. Twinn Sports were 10 speed, with 27" tires (Twinns & Deluxe Twinns had 26" tires).

If you were to move the shifting to your position, would your stokers be happier?

The truth is, you could find a decent used, more modern tandem, for less than it would cost you do modify this one.

Rick
TeamTi700 is offline   Reply With Quote
Old 10-24-09, 07:28 AM   #3
Stray8
Senior Member
 
Stray8's Avatar
 
Join Date: Aug 2008
Location: Nueva York
Bikes:
Posts: 647
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by TeamTi700 View Post
The truth is, you could find a decent used, more modern tandem, for less than it would cost you do modify this one.
Ditto.


Quote:
Originally Posted by woodbuda View Post
And here's the cherry to top it off: I can't put much money into this, so replacing the entire cassette and derailleur is not an option. Any thoughts? Any additional info that would help?
What is your budget? What type of tandem riding do you do with your wife/daughter (e.g. tooling around the neighborhood)? There are also inexpensive low end new tandems that are more modern (i.e. indexed shifting) that could be had for less than the cost of a component upgrade. Wouldn't be compaqrable to your Trek, but might still be enjoyable to ride Two up.


.

Last edited by Stray8; 10-24-09 at 07:56 AM.
Stray8 is offline   Reply With Quote
Old 10-24-09, 07:34 AM   #4
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,734
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
I doubt that anything is going to index with an Alpine Gear freewheel. My advice is to try to love it the way that it is.

If you happened to acquire that bike in the St Louis area please PM me. If that's the case, I'm probably the one that's responsible for recreating it. If you're interested, I'll tell you the long story of how it came to be.
Retro Grouch is offline   Reply With Quote
Old 10-24-09, 09:41 AM   #5
Duo
Senior Member
 
Join Date: Aug 2009
Bikes:
Posts: 244
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
We bought an old Schwinn Duo Sport this summer that was fairly beat up. The former owner put flat type of handlebars on the thing with an indexing thumb shifter. The wheel was an old steel wheel, so i replaced that and put on a new 6 speed Shimano freewheel and it indexes just fine with a 6 speed Shimano thumb shifter. The drop out measured 128 mm and i use a spacer so everything fits snugly.

The LBS just says to come on in whenever i want to upgrade the thing. We are thinking of a 7 speed cassette now or maybe trying a 700c wheel. If it doesn't work then he will just throw the part back on the shelf. The old Schwinn Duo Sport is probably the best kept secret in tandem riding affordability. Originally built as a premium bike and now can be had for cheap. Hard to get info about the bike, so i had to learn bike mechanics myself to get the thing on the road.

If you can find an old timey type of LBS i am sure they can help you out a bunch. Let us know what you do, it may inspire me to further mod this ole bike. Finding quality indexing thumb shifters is getting tougher to do, but i found that talking to the LBS many times they have stuff sitting on the back shelf.
Duo is offline   Reply With Quote
Old 10-24-09, 07:52 PM   #6
zonatandem
Senior Member
 
zonatandem's Avatar
 
Join Date: Dec 2003
Location: Tucson, AZ
Bikes: Custom Zona c/f tandem + Scott Plasma single
Posts: 10,858
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 29 Post(s)
Have seen a Gitane tandem with all shifting done by the stoker back in 1975 on TOSRV.
It makes for shorter der. cable runs, but pilot has to tell stoker when to shift as he has best view of the terrain uphead.
Agree with Duo the Schwinn DuoSport was an affordable tandem ($1,200 new); we did the test riding for Schwinn for 3 months on one of the prototypes and it was lotsa bang for the buck at that time.
Pedal on TWOgether!
Rudy and Kay/zonatandem
zonatandem is offline   Reply With Quote
Old 10-25-09, 03:58 PM   #7
woodbuda
Newbie
Thread Starter
 
Join Date: Aug 2009
Bikes:
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for input

Thanks all with your input. Retro Grouch, you comment was what I was worried about. I think I'll end up selling this Schwinn and looking for something during the off-season this winter. Here in the Chicago area, the market for tandems is pretty good in the summer for anything above the Micargi/Kent/etc. internet bikes. I paid $250 for this in August. To make it more marketable, I may just move the existing shifters up to the captain position.

For those that want to take a look at this beast, here are some shots taken this afternoon:
http://picasaweb.google.com/woodbuda...eat=directlink

For TeamTi700, the serial number prefix is HF, which I think translates into a 1970 frame. I can see on the frame where there was once a lever shifter for a 5-speed.

Anyway, thanks to all of you for your help! While I used to do a fair amount of riding myself, the tandem riding will mostly be with my daughters, who won't ride with me if I'm on my own bike. My wife doesn't ride at all, but I think she's intrigued with the tandem concept (i.e., shared pedaling, close enough to talk, etc.).
woodbuda is offline   Reply With Quote
Old 10-25-09, 05:09 PM   #8
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,734
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 140 Post(s)
I don't think that's my old bike. That looks like factory paint and I repainted mine. I also installed an aftermarket fork that's much different from the one shown.

My wife and I rode ours for about 8 years including some quite hilly 50 milers. At the time it was the best that we could afford. A few people skoffed openly but we were together and we were on the road having fun. I eventually sold it to a family who had a totally blind daughter. The daughter would ride a bike around and around their cul-de-sac. The dad wanted a tandem so he could do longer rides with her but they didn't have very much money. We worked it out. I still have fond memories of that bike.
Retro Grouch is offline   Reply With Quote
Old 10-25-09, 05:55 PM   #9
TeamTi700
Senior Member
 
Join Date: Feb 2006
Bikes:
Posts: 167
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
"HF" is August of 1970. It started life as a "Campus Green" Deluxe Twinn. It looks like the only original parts are the frame(but not fork), stoker's stem, and chain tensioner.

I would invest in moving the shifters to the captain's position and leave it at that.

Enjoy!

Rick
TeamTi700 is offline   Reply With Quote
Old 10-26-09, 09:59 PM   #10
Stray8
Senior Member
 
Stray8's Avatar
 
Join Date: Aug 2008
Location: Nueva York
Bikes:
Posts: 647
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Retro Grouch View Post
At the time it was the best that we could afford. A few people skoffed openly
There seem to be a-holes everywhere sometimes...

Glad that you had fun on it together despite the leers, and glad for the blind girl...




.
Stray8 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 09:52 PM.