Haro Mid BB Kit

Mid is a specific bottom bracket standard common in BMX and freestyle bikes. It refers to the size of the bottom bracket shell on your frame, which is designed to press-fit the bearings directly into the frame without the need for an external cup.

This kit is designed for cranks that use a 19mm spindle, which is the standard size for Mid bottom brackets. Please verify your crank spindle diameter before purchasing to ensure a proper fit.

Sealed bearings are significantly more durable and require less maintenance than unsealed, loose-ball alternatives. They are encased to keep dirt, grit, and moisture out, ensuring your cranks spin smoothly even after heavy use in harsh conditions.

Yes, you will need a bearing press tool to install the bearings into your frame without damaging them. While some riders use a DIY method with a threaded rod and washers, a proper bearing press is the safest way to ensure they are seated perfectly straight.

The included alloy internal spacer sits between the two bearings to prevent them from being crushed when you tighten your crank bolts. The additional cone and crank arm spacers allow you to fine-tune the chainline and ensure your cranks are centered correctly within the frame.