Difference between revisions of "PVD IS Head Tube"

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The head tube came in a little heavy due to a few manual machining considerations and some mistakes I made in the process. I would expect that a perfect CNC version to weigh in at ##.
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The head tube came in a little heavy due to a few manual machining considerations and some mistakes I made in the process. I would expect that a perfect CNC version to weigh in at 125g.
  
 
Comparing this to a "standard" [[PVD_Head_Tube|PVD light machined head tube]] (93g) and a Chris King 1 1/8" headset (98g), this design doesn't add any real weight but is a far superior design.
 
Comparing this to a "standard" [[PVD_Head_Tube|PVD light machined head tube]] (93g) and a Chris King 1 1/8" headset (98g), this design doesn't add any real weight but is a far superior design.

Revision as of 17:43, 1 August 2007

Most framebuilders that work with steel have ignored the newer integrated headset design. I belive that it is the future. I decided to make up some very special head tubes for my bike projects.

Design

IS-Head-Tube.gif

Stock

The 4130 stock required for this part is very rare. 1.750 OD x .250 Wall.

I ended up ordering the stock from Factory Steel and Metal Supply Co. out of Detroit, MI. EMJ Metals out of Freemont would be another good choice.

The price was $18.70 per foot with a $20 cut charge from 20 foot lengths. A six foot section should be enough to get 14 x 4.5" tubes.

Machining

A bushing was required to hold the part during machining.

Is head tube 4.jpg

Finishing

Special cutters will be required to finish the frame post welding. Cane Creek P/N TL0100. A little under $200 for these babies.

Is head tube 5.jpg

Is head tube 6.jpg

End Product

The head tube came in a little heavy due to a few manual machining considerations and some mistakes I made in the process. I would expect that a perfect CNC version to weigh in at 125g.

Comparing this to a "standard" PVD light machined head tube (93g) and a Chris King 1 1/8" headset (98g), this design doesn't add any real weight but is a far superior design.

Is head tube 1.jpg

Is head tube 2.jpg

Is head tube 3.jpg

On The Bike

Frame scheduled to be welded mid August.

see: PVD 5.5 Fork Hardtail