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@Shanghaied
On a 68mm mtb bb shell you use three 2.5 mm spacers, one on the left, two on the right. On 73 mm bb shells you use just one spacer on the right (drive side). Makes sense that there are no spacer on a 68 mm road bb - that last spacer on the right on mtb presumably both makes room for the triple mtb crank and gives the correct chainline for a wider rear spacing (135 mm for mtb vs 130 mm for road).