How To Install A Spanish Bottom Bracket Bmx

1 of the frequently asked questions is, what type of bottom bracket practice I need for my bike? To help you out, We take created this article with every information yous need to know near lesser brackets (BB). Nosotros have 4 basic types of BB (Euro, Spanish, Mid, USA).

The bearings on the picture above are sorted from the smallest to the largest - Euro size, Spanish size, Mid size and Us size. Find that the EURO and the USA size bearings are both pressed in a example. EURO and USA size bearings aren't sold separately.

Before nosotros dive into the detailed clarification of each BB blazon, let's take a look on what does mark SB or BB mean.
SB - Sealed Bearings: Quality sealed bearings
BB - Ball Bearings: unsealed bearings (less quality plus difficult maintenance). Nowadays the ball bearings are simply used on some of the lower level complete bikes aimed at beginner riders.

CHOOSING THE Right BOTTOM Subclass
If you desire to be sure what blazon of bottom bracket y'all should become, then you need to know these three basic specifications.

1. Bottom subclass shell type: USA, MID, SPANISH, EURO. Each name stands for the different bearings size which but fits with frames that have the same lesser subclass shell.

ii. Diametter of your crankset spindle: 19mm, 22mm or 24mm.

3. Bearings version: BB (ball bearings) or SB (sealed bearings)

TBB-BIKE marking example: "3457 WTP Mid size BB kit 19mm" // production number, manufacturer, blazon, kit=complete set (bearings, spacers etc..), spindle diameter.

Bottom Bracket BEARINGS BY SIZE
Bottom bracket vanquish inner bore determines the bearings outter diameter size. There are 4 basic types of bottom brackets in BMX. The smallest one is Euro size (rarely used today), than Spanish size, Mid size and the largest one is USA size. It is safe to say that most used lesser bracket in bmx today is Mid size with the Spanish size on the second place.

Euro size BB
Smallest 1 out of all the other bottom brackets. EURO size bearings are pressed into aluminium case with outter thread that is screwed into the bottom bracket shell. This type of BB is rarely used today as it was very deffective and hard to maintain.

Marker example: 22x31x72xRS // ISK or 1905137 - 2RS // NBK

Specifications:
- diameter: 31mm
- width: 6,9mm
- inner thread: 1.370" 10 24tp

Spanish size BB
Bottom bracket shell is more lightweight than Mid size. Bearings are pressed right into BB shell. It is mostly used by the companies producing frames of the everyman possible weight (Fly bikes, Macneil..).

Marking case: 22379 - 2RS // NBK

Specifications:
- diameter: 37mm
- width: 9mm

Mid size BB
Nigh used bottom subclass in BMX. Stronger, more than durable and a lilliputian heavier than the Castilian BB. Mid size bearings are pressed direct into the bottom bracket shell.

Marking case: R12 RSD 22

Specifications:
- diameter: 41,3mm
- width: 11mm

USA size BB
Original BMX bottom bracket with bearings pressed into steel case which is afterwards pressed into BB shell. Information technology is no longer used.

Marking example: R12 2RS // ISK

Specifications:
- diameter: 51,5mm
- bearings diameter: 41,3mm
- bearings width: 11mm

HOW DO You lot Discover OUT WHAT TYPE OF BB Exercise YOU HAVE?
Information technology'south simple, simply google the type/model/name either of your frame or complete bike and await for this information in description bellow the product. Everything yous need is right at that place. If you are not able to detect your frame/bike online, so take a ruler and measure out all neccesery sizes to detect out what type of BB yous have (utilize the details in a higher place). Don't forget to check the spindle size of your crank gear up and then you lot know exactly what yous need.

GENERAL DESCRIPTION OF BOTTOM BRACKET
The BMX Lesser bracket is composed of the parts you can see in the movie beneath. Information technology is recommended to always get the whole BB ready instead of simply replacing some parts.

TIPS FOR BOTTOM Subclass INSTALATION
Bottom bracket instalation is non an easy task and if information technology's your first time doing it, we recomend you to get some profesional assist.

- do everything with deliberation and patience
- lube all the parts well ( bb trounce, bearings, spindle, cranks, bolts..)
- easiest manner to press the bearings into the BB beat out is to put them directly on the hole, place a small wooden plank over and hit it with a hammer to printing the bearing in
- spacer tube has to fit tightly, otherwise the bearings will be destroyed within a short catamenia of time
- for 48-groove splines you will need a crank arm remover

HOW TO INSTALL A MID BOTTOM Subclass WITH JIM BAUER - TRANSWORLD RIDE BMX MAGAZINE