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Swedish/Norwegian Bottom Brackets-One piece cranks

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Swedish/Norwegian Bottom Brackets-One piece cranks

Old 10-21-16, 03:33 PM
  #26  
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Originally Posted by fietsbob View Post
"Thun" Bike Bottom bracket The company of that name does not make them any More as I try to look them up
Did Thun make 1 piece and single cottered cranksets (where the non-drive side was cottered)?
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Old 11-11-16, 01:40 PM
  #27  
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Originally Posted by dweenk View Post
Did Thun make 1 piece and single cottered cranksets (where the non-drive side was cottered)?
The usual arrangement is a non-tapered splined spindle and a pinch bolt on the non-drive side crank arm. The arm has both a hole for the spindle and a slot going from the spindle hole out the edge of the head. What at first appears to be a cotterpin when set is fully assembled is actually a pinch bolt which pulls the slot closed.

Randy's Chiorda mixte came with a set of this type; in this case made by Agrati.

https://www.mytenspeeds.com/My_TenSpe...ll_TQF_L_1.jpg

https://www.mytenspeeds.com/My_TenSpe...l_Side_L_1.jpg

This bicycle's shell is threaded Italian but the crankset does not make use of the threads.

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Old 12-04-18, 08:26 AM
  #28  
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I will add my own experience with an old fauber BB. NDS cup unscrewed clockwise, drive side unscrewed anti-clockwise. Got the NDS off with moderate effort after having soaked in penetrant. DS cup was an absolute monster to get off. After having unscrewed DS cup, no penetrant was visible on the threads (5-56). I used a punch and a hammer to hammer the cup in the unscrew direction. The most important thing, after having appropriate tools, I found to be applying the punching force in a as tangential way as possible. If you are off the tangent too much, you make no progress even if you have broken it free. All tools and the cups survived the treatment. The punch was deformed, but luckily they are not expensive. The cups have some marks on them, but nothing major as they are made of a very hard type of steel.

The pliers are used to hold the punch while you hammer it.
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Old 12-06-18, 09:59 PM
  #29  
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Old 12-07-18, 07:16 AM
  #30  
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Originally Posted by fietsbob View Post
"Thun" Bike Bottom bracket The company of that name does not make them any More as I try to look them up
I recently installed a Thun torque sensing BB in a bike I coverted to electric assist, so that name is still around.
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