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Schwinn Tandem Cranks!

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Schwinn Tandem Cranks!

Old 02-08-10, 10:26 AM
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dixonmcqueen
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Schwinn Tandem Cranks!

Hello! I am revitalizing a Schwinn Deluxe Twinn, I believe a 1971 model.

Unfortunately, a previous mechanic was learning when working on the bike, and the stoker crank is stripped on the non-drive side. The cone can be pushed past the threads without really threading it. I really like the idea of converting the bike to modern bottom bracket cartridges, but am unemployed so I'd like to keep the fix as correct as possible while also as cheap as possible (and, since its a tandem, am slightly intimidated that I'd screw up the chain alignment or something).

Question: are all schwinn one-piece cranks the same? Did the tandems receive special cranks at the stoker since there are (2) chainrings? The threads on the adjustable race seem serviceable for the time being, the bearings are soaking, and I'll need to replace the washer (but that'll be easy). I don't see any egregious pitting, etc. I'd like to simply replace the crank and keep going for the time being, if possible.

The current crank has the marking "SA 1 70"

ANY help is appreciated! Thank you.

(i've attached a picture just so you have something to look at...)

IMG_3320_1.jpg
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Old 02-08-10, 11:53 AM
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I had a similar problem on a Twinn. Except my stokers crank was bent. A fellow forum member hooked me up with a crankset from a Varsity or similar 10 speed. Worked like a charm! Didn't match perfectly but it was cheap (free actually...Thanks Stringbreaker!) and worked perfectly.
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Old 02-08-10, 12:32 PM
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Schwinn in 1978 to 1980 built a tandem that was basically a Twinn but with three piece cranks and 10 gears. The bottom brackets were BMX parts off Schwinns BMX shelf that used the big bearings of a Twinn but tapered three piece crank arms. Google Sports Twinn and you can find information about it. Roger
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Old 02-08-10, 12:34 PM
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I'm doing a Twinn now, and I'm hoping to go with 3-piece cranks. Thanks for the info.
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Old 02-08-10, 09:30 PM
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Originally Posted by rhenning View Post
Schwinn in 1978 to 1980 built a tandem that was basically a Twinn but with three piece cranks and 10 gears. The bottom brackets were BMX parts off Schwinns BMX shelf that used the big bearings of a Twinn but tapered three piece crank arms. Google Sports Twinn and you can find information about it. Roger
Here is a picture of my Twinn Sport BB and shell as it came to me.



Since I converted mine to a 3 piece crank, I had these BB as spares and decided to use one in my circa '39 New World.



Originally Posted by RobbieTunes View Post
I'm doing a Twinn now, and I'm hoping to go with 3-piece cranks. Thanks for the info.
I did this. It was a challenge to find the correct width BB, but I finally found what I needed to work with the cranks I used.



DixonMcQueen,

If you would like to try out a Varsity-Continental-Super Sport crankset, PM me. I have a spare or two I can give you.
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Old 02-25-10, 07:45 PM
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Alright! for posterity's sake, here's what I've learned so far:

Pastor Bob sent me a crank off a varsity. For the most part it worked beautifully. The bike rides! Two small differences:

1) the drive side journal is a wee bit shorter. I was able to thread the race on, and it is snug, but it does not thread COMPLETELY on. works for me, but someone in the future may have different goals. i'll post pictures within a week or so.

2) the crank Bob sent me hugs the frame a little tighter than the stock crank. as a result, it conflicts with the chain guard so I've had to leave that off for the time being.

However, for now, it rides! a lot of cleaning and a lot of lubrication have gone a long way. Ive included a picture below. Old tires, and the fenders are off cos i'm still cleaning them. I've polished a lot of chrome since I took the picture, but here's Daisy Mae Buttercup in her in-progress glory:

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Old 02-25-10, 07:47 PM
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this got left out of my last post:

Thank you Bob! And thanks to my neighbor down the street for his freewheel tool. He's on here somewhere, but I don't know his handle.
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