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@user8746
Hold a ruler against the bb cups on your bike. Measure the distance between the bb shell, ie. the bit thats a part of the bike frame, and the crank arm/bb interface. Include any spacers in this, but make a note of how wide they are. If the mtb cups have the same dimensions, or you can get the same dimensions using spacers, you're good to go.
Then use the spacing tube that fits. Theoretically you could use no spacing tube, but stuff might start getting rusty so this is probably not a good idea.