The R80GS frame used was chosen because of it's single tube 'spine' and non-tapered front down-tubes. Earlier models used a tube-within-a-tube spine and tapered front legs. In stock configuration, the R80GS frame is lighter than those used on other models if NOT as 'strong'. It is likely that BMW's later model frame changes were simply a bean-counter's cost-cutting consideration – but perfect for those obsessed!

The 2 main diagonal frame members are put into place to stabilize the relationship between the head-stock and the swing-arm pivots:

And then it's chop-saw time for all that extra steel: