sakarias
12-22-02, 06:38 PM
I have installed a Shimano ES-70 bottom bracket cartridge on my bike (as part of changing from Shimano 105 to XT series to move my bike's gearing down for a better range for touring).
I have done this on another bike without problems. This time I have an unexpected issue.
My problem: When torqued to about 450 in-lbs (the specification range is 435-608 in-lbs -- from Shimano's literature), the spindle has an over tightened feel, not turning smoothly and being rather stiff. When I backed the lockring off to the point where the spindle just ran smoothly, the torque was only about 200 in-lbs.
All one bike maintenance book I have says about a situation like this is to "... try again." Ok, fine. What is this supposed to mean?
Anyway, I greased the right side threads before I installed the main body of the BB. I used anti-seize compound on the lockring (since it is aluminum alloy while the frame is cro-mo and the cartridge stainless(?) steel.
I tightened the right side tight against the BB shell.
In addition to the anti-sieze on the lockring threads, I spread a layer of Phil Wood grease on the hard rubber seal on the inside of the lockring.
Initially I tightened the lockring by feel using a 12" wrench. Then I checked the spindle. When I found the spindle felt over tightened, I brought out the torque wrench.
I am guessing the BB may be defective, though brand new. That is a bit unexpected. Any thoughts? Any similar experiences?
(I have searched the Bike Mechanics Forum and not found anything similar brought up before.)
I have done this on another bike without problems. This time I have an unexpected issue.
My problem: When torqued to about 450 in-lbs (the specification range is 435-608 in-lbs -- from Shimano's literature), the spindle has an over tightened feel, not turning smoothly and being rather stiff. When I backed the lockring off to the point where the spindle just ran smoothly, the torque was only about 200 in-lbs.
All one bike maintenance book I have says about a situation like this is to "... try again." Ok, fine. What is this supposed to mean?
Anyway, I greased the right side threads before I installed the main body of the BB. I used anti-seize compound on the lockring (since it is aluminum alloy while the frame is cro-mo and the cartridge stainless(?) steel.
I tightened the right side tight against the BB shell.
In addition to the anti-sieze on the lockring threads, I spread a layer of Phil Wood grease on the hard rubber seal on the inside of the lockring.
Initially I tightened the lockring by feel using a 12" wrench. Then I checked the spindle. When I found the spindle felt over tightened, I brought out the torque wrench.
I am guessing the BB may be defective, though brand new. That is a bit unexpected. Any thoughts? Any similar experiences?
(I have searched the Bike Mechanics Forum and not found anything similar brought up before.)
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