don_k Posted May 9, 2011 Share Posted May 9, 2011 On my R1100 RT there is a small sub-frame part attached to the back of the frame and includes the two vertical supports for the aft end of the luggage rack. Both vertical supports have broken off. I plan to weld it back together but am unsure if it's stainless steel or just steel. A magnet is attracted to it so I know it's not aluminum but there are places where the paint has worn off and there is no rust on it. It would seem a bit unlikely to me (but what do I know) that the frame of the bike would have been made of stainless steel (because of the cost, but then again it is a BMW) but not impossible. Does anyone know for sure what kind of steel the frames are made of? Thanks, Don Link to comment
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