Shimano UN55 English SQUARE-JIS 73x110mm Bottom Bracket giant When all you need is

When all you need is a shield to block wind

Advanced knob shaping creates extra gripping edges

9mm max dimension is controlled by the Shimano spec

It delivers precise and consistent shifting performance across a wide range of MTB conditions

Heat Sink: No

Shimano UN55 English SQUARE-JIS 73x110mm Bottom Bracket giant When all you need isShimano's BB UN55 Square Spindle Bottom Brackets are the unofficial standard for English threaded cartridge bottom brackets. Quality, value, and durability come together to keep you cranking for many, many miles. Fits JIS Square Taper Cranksets Hollow spindle Crankarm fixing bolts not included