Yes, indeed electrolytes are important, especially on longer rides. For a commute ride (45 min. at low intensity) I drink plain water and don't eat anything or supplement with electrolytes.

On longer rides (i.e. club rides or touring), I use a sports drink that is made from protein and electrolytes, but is carb free (again, remember I have impaired glucose tolerance). I supplement that with almonds after about 2 hours.