At 10/21/2007 01:22 AM -0400, Doug Fattic wrote:
>I don't think their is a risk of failure if the sleeve joining the 2 parts
>of the steerer is thick enough and long enough and perhaps tapered at the
>ends.
Doug Once I determine the angle of taper of the butted section of the existing steerer, I'll externally taper the sleeve to match. This will allow a longer sleeve and avoid a stress riser. Internally tapering the upper end of the sleeve is a given.
At 10/20/2007 09:34 PM -0700, James Valiensi wrote:
>Hullo,
>I would never lengthen a steerer tube. I'd replace it by removing the
>original one. Having this part of the bike fail is quite disastrous,
>and I would not take on the risk.
James, What failure mode do you envision? A properly chosen sleeve will be as strong as the steerer itself, so the steerer isn't going to snap in half at the joint unless it's poorly brazed or the sleeve creates a stress riser. Not a job for a newbie, but I've been brazing and machining since the '70s.
Mark Stonich;
BikeSmith Design & Fabrication
5349 Elliot Ave S. - Minneapolis. MN 55417
Ph. (612) 824-2372 http://bikesmithdesign.com
http://mnhpva.org