1896 Crescent Pedal Crank Thread Change


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GiovanniLiCalsi

Cruisin' on my Bluebird
Jun 29, 2012
3,006
744
Alameda, California
#1
I have found a left hand pedal crank to replace my broken right side crank.
My question is what is the best way to modify the left side crank to accept a right side pedal?
I’m thinking about boring a larger hole and silver soldering a threaded busing into the bore. Does anyone know where I can find the bushing, with threads or should I just use a threadless bushing and thread it myself. I have new pedal taps, courtesy of Geobike.
Thanks
 

GiovanniLiCalsi

Cruisin' on my Bluebird
Jun 29, 2012
3,006
744
Alameda, California
#3
Not sure how that would change thread direction. Also there is not enough inside diameter inside threaded crank. Seems like it would be easy enough to bore threaded hole larger and silver soldering a bushing inside bore and thread it with a hand tap.
 

TR6SC

I live for the CABE
Jun 12, 2016
1,003
2,619
66
Eureka, CA
#4
It sounds like you need right hand threads in a left hand crank. The Heli-coil is an insert of threads. You drill out the existing threads, tap the hole, and screw in the right handed Heli-coil. The coil is put in under tension. It will not come out once inserted. Google up on it. I'm fairly certain this is the fix you are looking for.
 

GiovanniLiCalsi

Cruisin' on my Bluebird
Jun 29, 2012
3,006
744
Alameda, California
#5
I’m going to nickel plate the crank.Wouldn’t it be better to silver solder a smooth steel bushing?
 

GiovanniLiCalsi

Cruisin' on my Bluebird
Jun 29, 2012
3,006
744
Alameda, California
#6
This story gets worse!
I finally compared the found crank with my Crescent crank and they are two completely different sizes. There is no way it can be used.
If I can’t find an original crank, I’m going to have to cast one in steel....
 

tommydale1950

I live for the CABE
Jun 12, 2012
1,346
402
Fredonia, NY, United States
#7
This story gets worse!
I finally compared the found crank with my Crescent crank and they are two completely different sizes. There is no way it can be used.
If I can’t find an original crank, I’m going to have to cast one in steel....
Can you post a photo of the crank you need ? I have some loose ones Tom
 

GiovanniLiCalsi

Cruisin' on my Bluebird
Jun 29, 2012
3,006
744
Alameda, California
#8
Thanks!

1896 Crescent No.1 pedal arms.
• 9/16” bottom bracket x 1/2” pedal threads
• 7/8” profile width on bottom bracket end of arm
• 7-3/8” overall length of arm
• 25/64 smaller diameter of tapered arm
• 33/64 larger diameter of tapered arm

7E40B0C3-05F5-4CEA-A4AF-CC370B85B3F9.jpeg


C17676B6-45C3-40E3-98DC-67CDC13ABAF5.jpeg


4BD21705-6DD8-48FB-A282-1BA7A8CB8C2D.jpeg


3FA2BF28-B8FD-4154-B215-FB41CF04C44F.jpeg
 

GiovanniLiCalsi

Cruisin' on my Bluebird
Jun 29, 2012
3,006
744
Alameda, California
#10
The cranks that we’re sent to me are the wrong lengths. I will either need to find exact originals or have them cast in steel.
 

tommydale1950

I live for the CABE
Jun 12, 2012
1,346
402
Fredonia, NY, United States
#11

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