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What road double cranksets will work with a 108mm JIS square taper bottom bracket spindle?

3 min read

Asked by: Mandy Perry

What is a JIS bottom bracket?

J.I.S. J.I.S. is the Japanese Industrial Standard, and is generally used on square taper cranks made in Asia. All of the common black spindles identified with standard numbering use the J. I. S. taper. Many of these have a threaded boss for a nut on each end, rather than being hollow and threaded internally for a bolt.

What is the difference between JIS and ISO square taper?

ISO and JIS are very similar – the angle of the taper is the same, but the ISO spindle ends are a little slimmer. In a pinch, you sometimes can use a JIS spindle with an ISO crank. To compensate for the wider JIS taper, select a spindle that is about 1-2 mm shorter.

Are all square taper cranks compatible?

Taper matching was important in the past but all modern day/currently manufactured Chainsets are able to cope with either the ISO or JIS standard taper if they require a square taper bottom bracket, so the products are compatible and work just as well together, just adjust your chainline.

Are Shimano bottom brackets JIS?

It is JIS. Shimano doesn’t have separate Italian taper cranks, and it does not make sense to them to make BBs that do not fit their other products.

Is Shimano JIS or ISO?

Shimano and most other Asian manufacturers employ the JIS standard. Campagnolo and other European manufacturers use ISO.

Is hollowtech better than square taper?

Hollowtech is a bit stiffer and easier to take apart, but square taper will last much longer.

Are square taper bottom brackets still good?

Square taper bottom brackets have been around for over 3 decades and are still being used today..

How long do square taper bottom brackets last?

As for a bottom bracket, on the low end, maybe 5000 miles. The basic Shimano one most people use (UN51/55/similar) can reasonably expect 10k+ miles. But sometimes you get unlucky and get a bottom bracket that lasts maybe 500 miles.

What is square taper crankset?

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What is the difference between ISO and JIS standards?

In addition, JIS uses accuracy class designations of “C” for positioning screws and “Ct” for transport screws, whereas the DIN ISO standard uses the designations “P” for positioning screws and “T” for transport screws. The JIS B1192-1997 standard also includes several accuracy classes that DIN ISO 3408 doesn’t address.

What are the different types of bottom brackets?

There are two main types of bottom bracket design, one with a threaded shell which the bearings screw into, or a press-fit design which the bearings press into the shell.

How do you identify a square taper bottom bracket?

Found at any point here by hitting the information icon in the corner. The bottom bracket is the bearing system between your bicycles cranks.

What is a BSA threaded bottom bracket?

The short answer to your question is that when you see BSA in terms of a bottom bracket, it refers to a 68 or 73mm shell with 1.370/1.375″ x 24 TPI threads and a left hand thread on the drive side cup.

How do I know which bottom bracket tool I need?

You will need the ISIS style bottom bracket tool if your bottom bracket has 20 notches you will need the square tapered shaft bottom bracket tools shown here.

What is the difference between BB30 and BSA?

BSA is English standard and have screw thread inside the hole ,usually use in shimano,while BB30 is Italian standard and don’t have screw thread, usually use in CP.