You can see the inserted 27.2mm diameter x 1500mm length of standard Columbus tubing required for the round seatpost.
To the rear, you see the final aero shape of the airplane strut seat tube, two bolts to solidify the seatpost once mounted, plus the standard seat clamp lug. The bottom of the Columbus insert required a LOT of finessing, to taper it into the poly-conical shape of the aero seat tube.
Towards the bottom the upper intersectional gusset at the downtube and towards the front, the headtube/downtube gusset.
All in all, this was the most difficult frame build and design we had ever undertaken (although the racing tricycle and a couple of tandems, were pretty difficult as well). The carbon fibre came along and well that was the end of steel, until recently, when there has been a huge resurgence in the craftsmanship, and especially the lively ride feel of steel frames, has returned.
Finally a shot from the rear.
You can see the inserted 27.2mm diameter x 1500mm length of standard Columbus tubing required for the round seatpost.
To the rear, you see the final aero shape of the airplane strut seat tube, two bolts to solidify the seatpost once mounted, plus the standard seat clamp lug. The bottom of the Columbus insert required a LOT of finessing, to taper it into the poly-conical shape of the aero seat tube.
Towards the bottom the upper intersectional gusset at the downtube and towards the front, the headtube/downtube gusset.
All in all, this was the most difficult frame build and design we had ever undertaken (although the racing tricycle and a couple of tandems, were pretty difficult as well). The carbon fibre came along and well that was the end of steel, until recently, when there has been a huge resurgence in the craftsmanship, and especially the lively ride feel of steel frames, has returned.