Originally Posted by wroomwroomoops
There are 6-spoke wheels that are lighter than the lightest traditional spoked wheel. But I have no idea about their roundness. I would guess that, given precise casting and subsequent machining, their geometry could be made within the same tolerances as a well-trued traditional wheel.
Lester cast magnesium wheels were put in to a laythe and turned to true. From my under standing of the casting proccess the rims are made extra large in diam and turned down on the laythe. Most of the out of roundness comes from the edge of the rim and not on the inside towards the hub.
I personalyy dont know how far id trust a cast rim on mtb or roaad biike do to lateral flexxing esp around corners they could easly snap.