A new, accurate NMR titration method was utilized to determine relative basicities in four solvents of the two norbornylamines 2 and a series of cycloalkylamines 3-15, as well as some sec-alkyl amines. Cyclopentylamine (5) and cyclohexylamine (6) are substantially more basic than the small rings 3-4 and slightly less basic than the medium rings 7-11, with cyclooctylamine (8) the most basic. The large rings 12-15 are significantly less basic than 6. The basicities reflect CCC angles, hybridization, and also solvation. These results and their relationship to Baeyer strain theory are discussed.