What does MID bottom bracket mean?
A Bottom Bracket is the bearing system within your bike that connects the cranks to the frame. Most BMX bikes currently have a MID Bottom Bracket, this represents the size of the bearing required to fit into your frame. Mid is a push fit style Bottom Bracket and the bearings literally sit in the frame.
What size is mid BB?
Mid bottom bracket: The most common in BB size, used in almost all modern BMX bikes. Bearings press straight into a frame with BB diameter of 41mm.
What is American BB?
American BB Looseball Retainer Bearing 9 x 5/16 (PAIR) Wheels Manufacturing looseball-bearing in retainer. Comes as a set of 2 bearing / retainers.
What is the bottom bracket on a BMX?
The bottom bracket allows the rider to spin the cranks freely while pedaling, having a correct running bottom bracket is important as it’s the core of your BMX bike. The bottom bracket is made up of 2 individual bearing rings and a center spacer piece.
What does BB mean in bikes?
Your bottom bracket is that hollow bit at the bottom of the frame into which the bike’s cranks fit, to allow you to pedal. Once upon a time, all bikes were made of steel. It’s a material which lends itself to reaming and threading, so all bottom brackets had threads into which the chainset bearings screwed.
What does the 30 in BB30 refer to?
The term PF42 refers to the inside diameter of the shell. The term BB30 was an early term in the history of this standard and refers to the 30mm diameter of the spindle used at that time.
What is a European bottom bracket?
Well a euro bottom bracket has an inside diameter of just 35mm compared to a BMX bottom bracket inside diameter of about 50mm. A normal Profile axle is ¾” (19mm) diameter, so with a euro bottom bracket we have a gap of 8mm to fit the bearing and that nice adjustable threaded cup into.