For the most part, the personal endings of the strong preterite are used for the present tense; actually, the endings of the present tense of preterite-present verbs are more conservative, given that West Germanic retains the expected PGmc strong preterite 2 sg.
For the most part, the personal endings of the strong preterite are used for the present tense. In fact, in West Germanic the endings of the present tense of preterite-present verbs represent the original IE perfect endings better than that subgroup's strong preterite verbs do: the expected PGmc strong preterite 2 sg.