Ultegra bottom bracket removal

Nowadays, bottom brackets have disposable sealed cartridge bearings and, as frames have got beefier, bearings have increased in diameter to allow for lighter, stiffer chainsets using larger axles. And so goes the irresistible march of technological progress. However, while a traditional bottom bracket sits inside the frame and includes the axle in a single unit, Hollowtech bearings sit outside the frame and the axle is integrated into the crank. To check if your BB needs replacing, drop the chain off of the smallest chainring and spin the cranks. The left-hand crank is secured by two pinch bolts the compression cap in the end presses the axle against the bearings while the pinch bolts hold it in place. To remove the crank, first you must loosen the pinch bolts using a 5mm allen key.
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Bottom Bracket Standards and Terminology

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Bottom Bracket Standards and Terminology | Park Tool

The bottom bracket on a bicycle connects the crankset chainset to the bicycle and allows the crankset to rotate freely. It contains a spindle to which the crankset attaches, and the bearings that allow the spindle and cranks to rotate. The chainrings and pedals attach to the cranks. Bottom bracket bearings fit inside the bottom bracket shell , which connects the seat tube , down tube and chain stays as part of the bicycle frame. The term "bracket" refers to the tube fittings that are used to hold frame tubes together in lugged steel frames [1] which also form the shell that contains the spindle and bearings; the term is now used for all frames, bracketed or not.
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Crank & Bottom Bracket

Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It only takes a minute to sign up. When I tried to remove the bottom bracket bearing cups using the BB tool it was very hard to move or it's just stuck. Tried WD40 then slowly tapping the tool using a mallet didn't work.
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Sadly, no bottom bracket will last forever. Remove the pinch bolts bit-by-bit, then flip up the security tab and remove the pre-load collar. Next, using a soft faced mallet, you can tap the axle through, pulling the drive side chainset off. The next step is to remove the reducers that allow the bottom bracket to fit Shimano axles. If you want to remove the bearings only, you can use your punch again to tap it out of the bottom bracket assembly.
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