We’re rewarding the question askers & reputations are being recalculated! Read more.
2 deleted 47 characters in body
source | link

When changing to another crankset, do I need to change to the brand's specific bottom bracket?

You need a bottom bracket that matches the crank, and there has to be a bottom bracket option that will fit in the frame.

Shimano MTB crank specs are here. The 1x XT cranks, FC-M8100-1 or FC-M8120-1 will work with a threaded bottom bracket of 68 or 73mm width (which you presumably have) and a Hollowtech external bottom bracket.

However, note the FC-M8100-1 chainline is 55mm and requires rear spacing of 142 or 148mm and the FC-M8120-1 chainline is 58mm and requires rear spacing of 148mm. (These are the 'Boost' and Boost+' standards.) Your 3x drivetrain almost certainly uses a chainline of 47.5mm, so the XT crank will not work. This is going to be true of any modern 1x drivetrain.

if you really want to convert from an older or lower-end triple to a 1x (which is possibly not a good idea as you are throwing away much of your gear ratio range) the easiest path is to just remove the outer and inner chainrings, and possibly fit a narrow-wide ring in the middle position.

https://productinfo.shimano.com/#/spec/MTB/Front%20Chainwheel

When changing to another crankset, do I need to change to the brand's specific bottom bracket?

You need a bottom bracket that matches the crank, and there has to be a bottom bracket option that will fit in the frame.

Shimano MTB crank specs are here. The 1x XT cranks, FC-M8100-1 or FC-M8120-1 will work with a threaded bottom bracket of 68 or 73mm width (which you presumably have) and a Hollowtech external bottom bracket.

However, note the FC-M8100-1 chainline is 55mm and requires rear spacing of 142 or 148mm and the FC-M8120-1 chainline is 58mm and requires rear spacing of 148mm. (These are the 'Boost' and Boost+' standards.) Your 3x drivetrain almost certainly uses a chainline of 47.5mm, so the XT crank will not work. This is going to be true of any modern 1x drivetrain.

if you really want to convert from an older or lower-end triple to a 1x (which is possibly not a good idea as you are throwing away much of your gear ratio range) the easiest path is to just remove the outer and inner chainrings, and possibly fit a narrow-wide ring in the middle position.

https://productinfo.shimano.com/#/spec/MTB/Front%20Chainwheel

When changing to another crankset, do I need to change to the brand's specific bottom bracket?

You need a bottom bracket that matches the crank, and there has to be a bottom bracket option that will fit in the frame.

Shimano MTB crank specs are here. The 1x XT cranks, FC-M8100-1 or FC-M8120-1 will work with a threaded bottom bracket of 68 or 73mm width (which you presumably have) and a Hollowtech external bottom bracket.

However, note the FC-M8100-1 chainline is 55mm and requires rear spacing of 142 or 148mm and the FC-M8120-1 chainline is 58mm and requires rear spacing of 148mm. Your 3x drivetrain almost certainly uses a chainline of 47.5mm, so the XT crank will not work. This is going to be true of any modern 1x drivetrain.

if you really want to convert from an older or lower-end triple to a 1x (which is possibly not a good idea as you are throwing away much of your gear ratio range) the easiest path is to just remove the outer and inner chainrings, and possibly fit a narrow-wide ring in the middle position.

https://productinfo.shimano.com/#/spec/MTB/Front%20Chainwheel

1
source | link

When changing to another crankset, do I need to change to the brand's specific bottom bracket?

You need a bottom bracket that matches the crank, and there has to be a bottom bracket option that will fit in the frame.

Shimano MTB crank specs are here. The 1x XT cranks, FC-M8100-1 or FC-M8120-1 will work with a threaded bottom bracket of 68 or 73mm width (which you presumably have) and a Hollowtech external bottom bracket.

However, note the FC-M8100-1 chainline is 55mm and requires rear spacing of 142 or 148mm and the FC-M8120-1 chainline is 58mm and requires rear spacing of 148mm. (These are the 'Boost' and Boost+' standards.) Your 3x drivetrain almost certainly uses a chainline of 47.5mm, so the XT crank will not work. This is going to be true of any modern 1x drivetrain.

if you really want to convert from an older or lower-end triple to a 1x (which is possibly not a good idea as you are throwing away much of your gear ratio range) the easiest path is to just remove the outer and inner chainrings, and possibly fit a narrow-wide ring in the middle position.

https://productinfo.shimano.com/#/spec/MTB/Front%20Chainwheel