Asked By: Philip Long Date: created: Oct 19 2021

How do I know what size my bottom bracket is

Answered By: Albert Henderson Date: created: Oct 19 2021

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.

Asked By: Horace Clark Date: created: Sep 19 2021

Do all cranks fit all bottom brackets

Answered By: Kyle Hill Date: created: Sep 20 2021

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.

Asked By: Patrick James Date: created: May 24 2021

Are bottom brackets all the same size

Answered By: Matthew Wright Date: created: May 24 2021

There are 4 widths available with BSA bottom brackets; 68mm, 73mm, 83mm or 100mm. … 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. The 83 mm and 100 mm dimensions have become rare these days.

Asked By: Malcolm Williams Date: created: May 25 2021

How do I determine bottom bracket spindle length

Answered By: Bruce Scott Date: created: May 28 2021

The only measurement for a bottom bracket you can do with the bottom bracket still on the bike is to do the shell width, which is the width of the frame where the bottom bracket installs. In order to measure the spindle length, you need to remove the cranks and then measure the spindle length.

Asked By: Walter Roberts Date: created: Feb 24 2022

How do I know if my crankset is compatible

Answered By: Oswald Thompson Date: created: Feb 27 2022

2 Answers

  1. Measure the length of the Bottom Bracket shell. …
  2. Count how many chainrings you have. …
  3. Count the teeth on the chainrings, or look for markings that may indicate the number of teeth (e.g.. …
  4. Count how many cogs you have at the rear. …
  5. Length of crank arm is less important for me.

More items…•Jan 2, 2015

Asked By: Henry King Date: created: Nov 04 2021

Will a 68mm bottom bracket fit a 73mm shell

Answered By: Colin Smith Date: created: Nov 06 2021

Multiple spacers are included in order to fit both sizes meaning if you see a BB for sale that says 68/73 it means it will fit both but it includes a couple spacers in the box to make it fit the 68, those spacers (or fewer of them) are not needed if the shell is 73mm wide.

Asked By: Evan Clark Date: created: Aug 01 2021

What is bottom bracket shell

Answered By: Ashton Jenkins Date: created: Aug 02 2021

The bottom bracket shell of a bicycle is the part of the frame where the spindle of the cranks go through. The bottom bracket and spindle together form the foundation of the drivetrain on your road bike or mountain bike. … The bottom bracket bearings are sometimes referred to as just the bottom bracket as well.

Asked By: Blake White Date: created: Nov 21 2021

What length spindle do I need

Answered By: Elijah Baker Date: created: Nov 22 2021

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.

Asked By: Gordon Cook Date: created: May 26 2022

How do I know what crankset fits my bike

Answered By: Reginald Lewis Date: created: May 28 2022

Crank length: This is measured from the centre of the bottom bracket axle to the centre of the pedal axle. Most stock bikes have cranks of 170mm or 175mm, but you can get them as short as 140mm and as long as 190mm. Choose crank arms that suit your inside leg measurement for optimum comfort and control.

Asked By: Matthew Barnes Date: created: May 22 2022

Will any crankset fit any bike

Answered By: Walter Reed Date: created: May 25 2022

Chainset choice is determined not only by the type of bike you are riding – BMX, MTB and road chainsets are not interchangeable – but also by the type of riding you prefer.

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