Looking for a Thompson stem for my road bike with about 15-17 degree rise but they do not make that size for a 26.0 handlebar. They do make a 5 degree rise and you can flip their -10 degree to get +10 but that is the limit on what they make for a road bike bar. They do have what I want for a 25.4 and the 31.8 handlebar. Is there any kind of standard shim that can be used to adapt a 25.4 or 31.8 stem to a 26.0 size? Even if there is, am I asking for trouble using them?
(Yes...I want that much rise. You will too when you get older)