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Vintage conversion help
Hi SS group.. I’m attempting my first single speed conversion on a 1977 Schwinn Traveler and need help figuring out my bottom bracket/crank situation. I want to get a more modern SS crank around 44T or so but not sure what to do about the BB. Attached are some pictures of my current crank and BB, which is just smoothed cups for the bearings. I assume I need to remove and replace with a modern retrofit BB but not sure?
Any guidance is greatly appreciated! https://cimg6.ibsrv.net/gimg/bikefor...478c79a7c.jpeg https://cimg8.ibsrv.net/gimg/bikefor...ec9b5c87e.jpeg https://cimg9.ibsrv.net/gimg/bikefor...c809f5cfc.jpeg https://cimg0.ibsrv.net/gimg/bikefor...ed714613f.jpeg |
I haven't worked with enough American/Ashtabula bottom brackets to be sure, but I think you need something like this - https://www.danscomp.com/truvativ-am...waAspfEALw_wcB
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maybe something like this...One piece crank to 3 piece square taper.
https://www.amazon.com/Fenix-Cycles-...f&gad_source=1 |
Originally Posted by Desert Ryder
(Post 23277446)
maybe something like this...One piece crank to 3 piece square taper.
https://www.amazon.com/Fenix-Cycles-...f&gad_source=1 Funny thing though. The boat anchor Ashtabula crank lasted twenty years, and the conversion didn't last five. All post apocalypse bikes will have Ashtabula cranks. |
Originally Posted by Desert Ryder
(Post 23277446)
maybe something like this...One piece crank to 3 piece square taper.
https://www.amazon.com/Fenix-Cycles-...f&gad_source=1 |
Originally Posted by downtube42
(Post 23277458)
i used something like that on my super sport.
Funny thing though. The boat anchor ashtabula crank lasted twenty years, and the conversion didn't last five. All post apocalypse bikes will have ashtabula cranks. |
Originally Posted by rustystrings61
(Post 23276877)
I haven't worked with enough American/Ashtabula bottom brackets to be sure, but I think you need something like this - https://www.danscomp.com/truvativ-am...waAspfEALw_wcB
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Originally Posted by GeezyRider
(Post 23277818)
This is the method I have used. It allows me to select the bottom bracket that achieves the best chain line.
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Originally Posted by FL_Gator
(Post 23277830)
Thanks, so if I install this kit then it allows me to install any standard threaded bottom bracket and then get a crank that works with that BB?
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Also, a quick tip for installing the adapter:
1. Lube the bottom bracket shell and press both sides of of the adapter into the shell. 2. Install the drive side portion of the bottom bracket. 3. Once the drive side of the bottom bracket is snug, continue turning it with your bottom bracket tool until the holes for the fastening bolts line up with the holes in non-drive side adapter. This is easiest way I have found to line up the holes for the adapter bolts. |
Originally Posted by GeezyRider;[url=tel:23277853
23277853[/url]]Also, a quick tip for installing the adapter:
1. Lube the bottom bracket shell and press both sides of of the adapter into the shell. 2. Install the drive side portion of the bottom bracket. 3. Once the drive side of the bottom bracket is snug, continue turning it with your bottom bracket tool until the holes for the fastening bolts line up with the holes in non-drive side adapter. This is easiest way I have found to line up the holes for the adapter bolts. |
https://cimg6.ibsrv.net/gimg/bikefor...14de49cad4.jpg
I used a Truvativ adapter for this bike. You have to hammer out the bb cups first. |
https://cimg2.ibsrv.net/gimg/bikefor...180086955.jpeg
I used the truvativ adapter and got it done, here’s the finished product. Thanks guys! |
Looking good.
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