The non-drive side (left side) on the English standard is a right hand threading, tightening clockwise. The drive side (right side of the bike) uses a left hand thread, tightening counterclockwise. ... These are: BSA, BSC, BC, ISO, British, and Euro, the name used in BMX bike circles.

Is BSA same as English?

These days, BSA, ISO, and English are used interchangeably to refer to what is now considered to be a standard threaded bottom bracket shell or bottom bracket.

What is a BSA threaded bottom bracket?

BSA. The BSA and Italian thread bottom bracket shells are predominantly something you find on bikes made before 2010. These two types of bottom brackets are the so-called threaded bottom brackets, which feature a thread on both sides of the shell. A frame with a BSA fit is incredibly commonplace.

How do I know if my bottom bracket is English or Italian?

The key difference is in how the two thread into the bottom bracket shell. Like pedals, one side of a BSA standard bottom bracket shell is reverse (left) threaded, while both sides of an Italian standard bottom bracket shell are regularly (right) threaded.

What is English threaded bottom bracket?

The common threading for bottom bracket shells is called “English.” The left-side cup is a right-hand thread direction, which tightens clockwise and removes counterclockwise. The right-side (drive-side) thread is a left-hand thread, which tightens counterclockwise and loosen clockwise.

Italian Bottom Bracket Threads vs English - What Da Diff - BikemanforU

35 related questions found

Can I use a 68mm bottom bracket in a 73mm shell?

This is the most common. There are two sizes for the width, 68 mm or 73 mm, and the inner diameter is 34.8 mm. Both the left and right threads go anti-clockwise. A 73 mm bottom bracket can be mounted in a 68 mm box using spacers, but it is not possible to mount a 68mm bottom bracket in a 73mm case.

What is the difference between English and Italian thread?

English (practically universal now) has left (reverse) threads on the non-drive side, and the shell width is 68 or 73 mm. Italian has conventional (right) threads on the non-drive side (which makes it try to unscrew itself) and 70mm shell width.

Are all bottom bracket tools the same?

There are many different brands and models of bottom brackets as well as many variations on tool fittings for their service.

Is Shimano Italian?

Shimano Yamaguchi Co., Ltd. (present Shimonoseki Factory) is established in Yamaguchi Prefecture, Japan.

What BSA means?

Body mass index (BMI) and body surface area (BSA) are two measures used frequently in health care, however, they are not well understood. While they are both indicators of body size, they provide very different information.

What is the difference between BB30 and BSA?

While both standard BSA threaded frames and BB30 frames have 68mm shells for road bikes, the external bearings of the BSA frame when used with an outboard bottom bracket would render a standard BB30 crankset's spindle too short to use with a BSA30 bottom bracket.

What is dub groupset?

In 2018, SRAM introduced mountain bike cranksets which use a new technology name DUB™ (Durable Unified Bottom Bracket). Meant to simplify frame BB and crankset compatibility across their product lines, it brought about yet another standard to understand.

What is BSA MTB?

English-threaded bottom brackets are known as BSA; it comes from British Standard Cycle. English threading on MTBs mean a 73mm wide, 34mm inside diameter shell with reverse threading on the drive side. It's the most common threaded standard employed today.

What is BSA 30 bottom bracket?

Product Description. ROTOR's BSA 30 Bottom Bracket is the solution to your quest to pair a modern, 30mm axle with your favorite English-threaded frameset. It'll work with both 68mm and 73mm shell widths, with the durability to last over the miles coming complements of a precisely CNC-machined alloy body.

Are threaded bottom brackets better?

Arguments in favor of threads are numerous, but only three are viable: Threaded cups can be serviced with simple wrenches that almost everyone owns; threaded cups allow component makers to have complete control over every moving part of the crankset from pedal to pedal; and finally, threaded type bottom brackets seldom ...

How many types of bottom brackets are there?

There are two basic bottom bracket systems in use: “threaded” bottom brackets and “press fit” bottom brackets.

What are English threads?

Thread pitch is the distance from the crest of one thread to another crest measured along the length of the thread. Pitch is best measured using a thread pitch gauge. So-called “English,” “Standard,” “Imperial,” or SAE threads are designated by the frequency of how many threads are counted along one inch.

What is French thread?

French lift is a thread that can stretch accordingly with the facial mimics, lift the face without causing distorted facial expression and is permanent for 4-6 years. Our skin that has difficulty in resisting gravity over time due to environmental and genetic factors, may get loose, sag and develop deep wrinkles.

Are all BB92 the same?

The end result is that the bearings are in the same spot as they would be with threaded cups outboard of a 73mm BB shell, and so all the dozens and dozens of cranks designed for that traditional system can be used in BB92. This means all 24mm high-end Shimano (Hollowtech II) and SRAM (GXP) cranks fit into BB92.

How many spacers does a 73mm BB have?

If your bottom bracket shell is 73mm wide, you only need one 2.5mm spacer fitted to the drive side.