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4

While the aluminum frame itself will be relatively ok, the problem will be your bottom bracket (almost certainly made in part of steel) which was most probably sitting in a big puddle of water. Even if the water didn't cause the bearings to rust, a freezing/melting cycle can cause damage to the bearings themselves, force lubricants out, and otherwise mess-up ...


4

Technically rust is limited to iron. What is bad is the rust starts and continues. The water / oxidizing agent is not consumed. Aluminum will oxidize but it forms a protective coating. An aluminum frame will not "oxidize out". Some iron alloys such as stainless steel prevent rust. I don't know why you don't seem to see stainless in bicycles.


1

Is the frame pure aluminium? Aluminium does not rust. If the frame is an alloy you would need to check whether or not the other materials are susceptible to rust.


1

If its better integration of rack & fender you seek, look into getting a rack with a centerline stud or nut that you can attach the outmost half of the fender to. See this pic for a rear fender+rack example.



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