Longer axle + washers.
OLD (over locknut dimension)
Mtb spacing 135 mm Fixed /single speed 120 mm Road modern 130 mm Road old 126 mm
Be careful of chainline though. I could not run a 42 mm chainline on my mtb unless the chainring was very small due to the chainstay.
@TheBrick(Tommy) started
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Longer axle + washers.
OLD (over locknut dimension)
Mtb spacing 135 mm
Fixed /single speed 120 mm
Road modern 130 mm
Road old 126 mm
Be careful of chainline though. I could not run a 42 mm chainline on my mtb unless the chainring was very small due to the chainstay.