Unless they're made of carbonfibre they will add further to the unsprung weight and impact the handling (looking for good reasons not to want some....!)
I would suspect perhaps a reduction in weight if all aluminum as compared to steel rims and steel spokes. Would be swell if MMC wouldgive some specs on them, or one of the few dealers that might get them could weigh them and share the info. Better yet, divulge who provides them to MMC.
The light at the end of the tunnel is actually a train. 2019 M3W
