What size bottom bracket do I need for my BMX?

Most BMX cranks are 19mm, 22mm or 24mm so if your frame has a MID Bottom Bracket and you Cranks have a 19mm axle, you need a MID 19mm Bottom Bracket. Another example would be if your frame has a Spanish Bottom Bracket and your cranks have a 22mm axle, you need a Spanish 22mm Bottom Bracket.

Can you convert bottom bracket?

The potential uses for bottom bracket conversion, or adapter, sets are many. Adapting a bottom bracket solution to a BB shell that cannot be changed is easier—and cheaper—than changing the frame.

Are all BMX bottom brackets the same?

BMX frames are made in a variety of sizes and shapes and the tubing where the bottom bracket fits is no different. Bottom brackets for BMX bikes come in 19mm, 19mm mid, 22mm, 22mm mid, and 24mm. Make sure to check with your local store before buying your bottom bracket to make sure you get the right one for your ride.

How do you change the bottom bracket on a BMX?

(Check out the post on Bottom Bracket Conversion Kits .) You screw bearing rings onto the spindle thread, one on each side. Each bearing cage rests against each bearing; the bearings rest against the bearing cups functioning as a bearing race.

Do you need a bottom bracket conversion kit?

If your switching frames and are going from a American sized BB to a new Euro BB frame, you’ll need this conversion kit in order to use your Profile, Redline, or FSA cr-mo cranks. Everything you need for Internal Bearing English/European Style bottom bracket frame – Two Threaded Cups, Four bearings, Tube spacers, Cone Spacers, Aluminum Spacers.

Do you need to change the bottom bracket on a bike?

If you are building up a new bike, you will need to know if the frame has a threaded or press-fit bottom bracket shell, and also the width of the shell. If you are replacing a current bottom bracket, you also need to consider the spindle and crank interface.

What are the different sizes of bottom bracket?

If your bike is designed for a press fit bottom bracket, you have a number of sizes and standards to choose from. These include BB90/BB95 used in Trek road and mountain bikes; PF86/92 used by Giant, Scott, Pivot and many others for road and mountain bikes; and the BB30 standard popularized by Cannondale.