Shimano UN300-K Square Taper Bottom Bracket Fcolourfamily_Green Converts from PM brake caliper

Converts from PM brake caliper to PM frames/forks (bolt spacing 74 mm)

The B-Box is used to split the main wire from Junction A to the front and rear derailleurs

Quick change from 2 to 4 bikes

With a maximum weight holding capacity of 100 lbs

Shimano UN300-K Square Taper Bottom Bracket Fcolourfamily_Green Converts from PM brake caliperShimano UN300 K Square Taper Bottom Bracket SHIMANO Square Type Bottom Bracket MTB Standard Structure SHIMANO quality performance cartridge bearing square bottom bracket Better chainline stability with chain line stabilizer Series: Shimano Tourney TX800 Series Fits JIS square taper cranksets Hollow spindle Crankarm fixing bolts sold separately Adapter material: Aluminum