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[QUOTE=pat_t;10154542]Genuinely interested in what you think are the answers to these questions Pete?
I see many other manufacturers using hollow anti roll bars on both road and race cars.
I imagine solid are cheaper to produce.
I can't think of an engineering reason why larger-diameter-hollow isn't better than smaller-diameter-solid for an equivalent torsional stiffness.
(assuming one has the space to fit the larger one)[/QUOT
Maybe I can help. Well yes a given bar size is what it is , not sure what that meant.
Hollows more expensive to make I read. A 35 hollow is like a 32 solid depending on wall thickness. Would have to be about a 3/16” Wall. Gm went to same size solid vs the 2010-11 hollows I bet so same clearances for fit , cheaper to make(?) and they are stronger size for size.
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