On a 68mm shell, with an MTB BB you'll have 3 spacers, normally one on the left and two on the right. All would be 2.5mm.
With a 73mm shell, you still have one spacer on the driveside, unless you're running an e-type (bb-plate-mounted) front mech or chain device, which noone does for polo.
On a 68mm shell, with an MTB BB you'll have 3 spacers, normally one on the left and two on the right. All would be 2.5mm.
With a 73mm shell, you still have one spacer on the driveside, unless you're running an e-type (bb-plate-mounted) front mech or chain device, which noone does for polo.