BB spindle length standard for single speed bike?

Asked by: Michelle Torres

The range is much smaller than with gears, track bb axle lengths mostly go from 103mm – 112mm (there are smaller and longer for less common cranksets). I think 103mm and 107mm are the most common sizes, given that their respective cranksets would be the most common cranksets.

How do I choose a BB spindle length?

The best way to find out which spindle length you need is by looking up the specs. (The alternative is trial and error…) Spindle length and the resulting chainline have some leeway. If you are within 2-3 mm of the “correct” 43.5 mm or 45 mm, you are doing quite well.

How do I know what length bottom bracket I need?

To find out the size of bottom bracket needed, measure the inside of the bottom bracket shell in your frame, it will be 73mm, 70mm or 68mm. Some older frames may have Italian threaded bottom brackets, instead of the more modern English.

Does bottom bracket spindle length matter?

The critical thing is your spindle length: as long as you can set up the correct chainline you will be good to go. But, again, best never to mix standards if you can at all avoid it. If you are looking to replace a cottered crank setup with a square taper setup, then look no further than a cartridge bottom bracket.

What is crank spindle size?

Spindle size:



The majority of crank spindles come in either a 24mm or 30mm diameter.

How do you measure a spindle?

Quote from video: The first method is the use of a digital caliper. Place the caliper at the bearing locations on the spindle the resulting. Number is the diameter of the spindle.

Can I put any bottom bracket on my bike?

To a certain extent which bottom bracket you end up buying is up to what kind of frame you have. Certain frame materials and drivetrain options only support one type of Bottom Bracket. There are two main types of bicycle bottom brackets in today’s market, namely, threaded and press-fit BB’s.

Is BB92 the same as PF92?

The frame’s bottom bracket shell inner diameter is 37mm. A bearing with an OD of 37mm is pressed directly into the frame. Trek is moving away from the BB90/95 system to what they call PF92, which is the same as a BB92 (41mm ID shell and 92mm width).

Are all bottom brackets the same size?

There are 4 widths available with BSA bottom brackets; 68mm, 73mm, 83mm or 100mm. This bottom bracket clearly shows you on the outside what bearings have been fitted to the bike. For road bikes, a BSA bottom bracket is always 68 mm wide. Other sizes, and particularly the 73 mm width, is commonplace with mountain bikes.

What cranks will fit my bike?

The three most common crank lengths for bicycles are 170mm, 172.5mm and 175mm. What size your bike has will likely depend on what size the frame is. Small bikes tend to come with 170mm cranks, medium with 172.5mm and large with 175mm.

Do all cranks fit all bottom brackets?

In general terms, most cranksets can be fitted to a variety of bottom bracket shells, though much of this compatibility depends upon the availability of suitable hardware (see next section). Any incompatibilities that do arise are often related to the length and/or diameter of the crank axle.

Do bottom brackets make a difference?

(Click here to read BikeRadar’s complete guide to bottom brackets.) According to Friction Facts’ latest report: “No statistically significant difference exists showing a general advantage or disadvantage of a standard type under similar loading conditions.

Are all square taper bottom brackets the same?

Whilst both versions of the square taper Bottom Bracket look the same, the European made ISO square taper spindles are slightly longer, tapering down to a small end than the Japanese Industry Standard (JIS) Bottom Bracket spindles do.

How long is a spindle?

The length is usually around 11 inches. The whorl of bottom whorl drop spindles is much like top whorl spindles where the whorl is rim-weighted and well-balanced. And also like top whorl spindles, a notch can be added to the whorl, if requested.

How do you measure hub size on a bike?

If you are unsure of your frame spacing or have an older bicycle, measure the hub width to ensure a proper fit. To do this, remove the rear wheel and use a pair of calipers or a ruler to measure the distance between the inner surfaces of the dropouts.

What is A2 spindle?

Type A2 – Short Taper

What do the numbers on a bottom bracket mean?

The numbers ranging from 86 to 132 refer to the nominal width of the shell in millimeters, which is not related to the press fit of the bearings. These bottom brackets will vary in the width of the dust sleeve used for that different widths.

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.

What is the difference between BB386 and BB386 Evo?

BB86 and BB386(Evo) are different standards and should not be included in the same conversation. Bb386 overall shell diameter is 46 mm diameter and the BB86 is 41 mm. 386evo BB with adapters, can run either 24 mm or 30mm styles. So if you are looking to run a shimano crank (24mm) that can be done on your 386.

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

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.

How do you measure a bottom bracket spindle?

Quote from video: So it's at its maximum width and then you come in here and just measure it and you're going to measure from the base. All the way to the tip of the splines. Okay easy enough right.

Will a 68mm bottom bracket fit a 70mm shell?

No. There are two different tapers, several different threads and several different lengths. Different bottom bracket shell widths.