I'm probably asking for trouble, but in my searches so far I haven't been able to find a taller quill stem with a long enough extension.
My bike has a 1 1/8" steerer, and 25.4 mm handlebars. My current stem is an adjustable model with about 60mm from minimum insertion to center and a 120mm extension set at 15 degrees positive rise. I can get the height I want by moving it up to 45 degrees, but then I lose the reach.
Picture of my stem.
Anyhow my "best" idea so far for getting things where I want them without a new fork and such was to use a threadless adapter like
this Nashbar model and then use a threadless extender like
this one by delta.
If anyone has any tips on a good stem I'm still open to that, but otherwise I'd like to know if this is reasonable and safe. I'm primarily concerned that (I think) the extender attaches to the star nut of a normal threadless setup, but I'm thinking the clamping bolts will probably be enough to hold it in place anyhow. Any thoughts/experience?