Interloc Racing Design QB55

The QB55 is designed for frames with a standard 68mm bottom bracket shell and English threading (BC1.37 x 24tpi). If your frame uses a different shell width or an Italian thread standard, this will not fit.

This unit uses a JIS 2-degree square taper interface. It is compatible with most vintage and modern square taper cranksets that adhere to the JIS standard, which is the most common type found on road and mountain bikes.

No, this uses a sealed cartridge bearing design. While you cannot service the internal bearings, the sealed construction is highly effective at keeping out dirt and moisture, offering a 'set it and forget it' experience until the unit eventually needs replacement.

Steel cups are significantly more durable and less prone to stripping or galling during installation compared to aluminum. While they add a negligible amount of weight, they provide a much more secure and long-lasting fit in the frame.

Yes, you will need a standard splined bottom bracket tool compatible with Shimano-style cartridge bottom brackets. Because the cups are steel, ensure you apply a light layer of grease to the threads before installation to prevent seizing over time.