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Heat treated will be safer (according to Nitto anyway), theirs come with a red band to indicate this.
withered_preacher-
Heat treated will be safer
All other things being equal, and assuming the heat treat increases the material strength. What actually happens in most cases is that manufacturers exploit a higher strength alloy composition or temper to reduce the amount of material, as everybody likes light weight bars until they break.
gbj_tester
Surprising conversation with a shop manager today about handlebars breaking where they meet the stem. Apparently aluminium handlebars should be regarded in the same way as chains and tyres, needing to be monitored and replaced every N km? News to me. I know (old, steel) rock climbing carabiners can develop micro fissures and fail catastrophically, but are properly manufactured and installed handlebars really also that vulnerable?