bike help

Aluminum isn't bad, you just need to watch the frame for cracks. That's with any frame even steel. If you have a 2stroke inframe because of vibration aluminum might be more prone to cracks but a lot of folks have no issues. Most so called alum frames are alloys and for the same mass compared to steel they are stronger.
 
I'm not a metallurgist so I couldn't give you the exact terminology one would use but aluminum is much more sensitive to vibrations than steel is so aluminum bikes tend to crack at the welds.
 
steel maintains its strength till it is bent,.. until bent it is always the same strength,...
aluminum even if it not stressed to the bending point loses strength as it is stressed, and develops cracks,.. even if is not stressed to the bending point aluminum will eventually fail.
 
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