Replacing Square Taper Bottom Bracket To Hollowtech II

One of the great things to upgrade an old bike is the drivetrain. Some people might want 10-speed and some might want singlespeed, it all depends on your preferences.

Today I’m going to replace the square taper bottom bracket, which is originally equipped with this 1994 Trek 720 Multitrack, to Hollowtech II in order to mount the new crankset.

The removal of the old bottom bracket is pretty straight forward, the bike hasn’t been left outside, so no major corrosion has affected to the removal of the components.

Before taking out the old bottom bracket, both crank arms have to be removed.

There are different cup diameters of Hollowtech bottom brackets, the most common sizes are 42 and 44 mm, this Shimano Ultegra is 42 mm.

The first impression after the install is the smoothness of the cranks. It used to have some resistance to the crankset, but now I couldn’t feel it, the spinning is much improved and I’m very impressed with that.

Parts installed:

Shimano Ultegra SM-BBR60 Bottom Bracket 68/70 mm Shell
Raceface Cadence X-Type Double Crankset 53/39t

Track: Lofi Mallet - Kwon

#trek #shimano #hollowtech

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