#declare TopFrame=union{cylinder {<44.7,0,28>,<38.1,0,30>,.65} //top steer tube      
                        cylinder {<38.1,0,30>,<37.1,0,30.303>,.55}          //skinny inny
                        difference{cylinder {<37.9,0,30.0606>,<35.9,0,30.6666>,.75}     // the fatness  
                                   cylinder {<36.5,0,29>,<36.5,0,32>,.13} }  //brakehole
                        
                        difference{torus{2.25,.61  scale<1.3,1,.95> rotate <90,18,0> }  
                                   torus{2.25,.59  scale<1.3,1,.95> rotate <90,18,0> }
                                   box{<-5,-5,-5><.5,5,5>}       
                                   translate <34.3,0,31.3>}    
                                   
                        difference{cylinder {<23,-1.8,11.5>,<23,1.8,11.5>,1} //top bb  
                                   cylinder {<23,-1.9,11.5>,<23,1.9,11.5>,.9}  }  //with the middle cut out
                        cylinder {<23, 0,11.5>,<39,0,29.5>,.6} //top bottom tube
                        cylinder {<23,0,11.5>,<41,0,7>,.6} //top seat tube/post
                        cylinder {<34,0,9>,<43,0,28.5>,.6}//top top tube}
                        }//end topframe