Does length of bottom bracket 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 bottom bracket length?

Road bikes usually use 68 mm (2.7 in); Italian road bikes use 70 mm (2.8 in); Early model mountain bikes use 73 mm (2.9 in). Later models (1995 and newer) use 68 mm (2.7 in) more commonly. Some downhill bikes even use an 83 mm (3.3 in) bottom bracket shell.

What length spindle do I need?

If you have a Mid or a Spanish BB on your BMX Freestyle bike, you need the 5 5/8″ spindle. If you have an American BB on almost any style of frame, you need the 5 5/8″ spindle. If you are using the Outboard BB and the Spline Drive Sprocket, and you BB shell measures 68mm wide, you need the 5 5/8″ Spindle.

Can I use a shorter bottom bracket?

Spindle length and the resulting chainline have some leeway. It just moves your chainline outward 1.5 mm. (The difference is split between both sides.) A slightly shorter spindle usually is OK as well, but check your clearances before deciding to move your cranks inward.

What do bottom bracket numbers mean?

5, BB92, BB107, BB121, BB132, PF24 and Shimano® Press-Fit. The numbers 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.

How do you measure a stair spindle?

Measuring for Balusters’ Length Measure the distance between a stair step and the banister directly above it. This provides the length you need for each baluster. Add 2 inches to this measurement if you are installing metal balusters, to provide extra space for you to drill the baluster into the banister.