How do I remove this?
#1
Senior Member
Thread Starter
How do I remove this?
My bottom bracket had developed a squeak and feels almost like it’s binding. How do I remove these crank arms? I’ve never seen this type before.
And the outer cups on the BB say do not disassemble, but there are arrows indicating which way to loosen.
I haven’t worked on this kind of BB before.
And the outer cups on the BB say do not disassemble, but there are arrows indicating which way to loosen.
I haven’t worked on this kind of BB before.
#2
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External bottom bracket:
should help. The cranks come off with a hex wrench, I believe. There are probably other videos on (for example) the Park Tools site.
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#3
Clark W. Griswold
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This is a standard Shimano Hollowtech II Crank.
You will need a 5mm hex wrench and a Hollowtech II crank cap tool and a hammer to gently get the drive side off once you have removed the non-drive side (and to put it back on). Think of it almost like a stem in that the crank cap is the top cap on a headset to adjust the preload and two bolts on either side just like a stem. You will want to adjust preload and then alternate tightening each bolt till you get to 12-14nm (use a torque wrench that is what they are for)
Here is a great video from master tech Calvin Jones at Park Tool if you are more visual:
You will need a 5mm hex wrench and a Hollowtech II crank cap tool and a hammer to gently get the drive side off once you have removed the non-drive side (and to put it back on). Think of it almost like a stem in that the crank cap is the top cap on a headset to adjust the preload and two bolts on either side just like a stem. You will want to adjust preload and then alternate tightening each bolt till you get to 12-14nm (use a torque wrench that is what they are for)
Here is a great video from master tech Calvin Jones at Park Tool if you are more visual:
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#5
Dangerous Old Man
Huh? I have had mega EXO/ EVO's give me a fit where a rubber mallet was necessary too install without bruising the palm of your hand...a rubber mallet is the way to go..depending on tolerances, your setup may require the same.
#6
Senior Member
Thread Starter
Thanks everyone. Ordering some tools so I can replace it. The bike is only 4 years old and didn't think it would wear out this quickly.
#7
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#10
Clark W. Griswold
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How do you remove external BB cranks like say a Hollowtech II crank? I tend to find it is quite handy to remove it with less time and hassle. With square taper cranks, no, a hammer should not be needed but that requires a less common tool.
#12
Clark W. Griswold
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#13
Senior Member
On the plus side the cap tool is relatively cheap, the BBs are pretty cheap, and the replacement goes very fast. A $20 BB and 15 minutes of your time every 4 years isn't terrible.
Depending wildly on your mileage and conditions, 4 years could be a pretty reasonable service life. However, if you're wearing bearings uncommonly fast it's possible you would get better bearing life if you brought your bike to a shop to get the bottom bracket shell faced to parallel and the threads chased. External bearing BBs are a little more sensitive to bearing alignment than cartridge BBs.
Depending wildly on your mileage and conditions, 4 years could be a pretty reasonable service life. However, if you're wearing bearings uncommonly fast it's possible you would get better bearing life if you brought your bike to a shop to get the bottom bracket shell faced to parallel and the threads chased. External bearing BBs are a little more sensitive to bearing alignment than cartridge BBs.