Brakehose: simple sweep, based on a circle and a 3D sketch.
Fork crowns: Just some extrudes, that's it.
Forkdecals: Decal function with photoworks
Handlebar and headset decals: Projected curves onto surface or wraps.

good luck!

 thanks i didnt realize it was as easy as that are you going to make a full bike?

 Yes, I am.

 nice cant wait to see that, what will the bike be?

 something you've never seen before
But be patient, it's gonna take a while.