1986–87 Primera División B de Baloncesto

The 1986–87 Primera División B was the second category of the Spanish basketball league system during the 1986–87 season.

Format
24 teams played this season.


 * First phase
 * Two groups; called Even and Odd, with 12 teams each, where they all play against everyone in their group at two laps.


 * Second phase
 * Group B1: Made up of those classified in the 1st, 2nd, 3rd, 4th, 5th and 6th of each group.
 * Group B2: Made up of those classified in the 7th, 8th, 9th, 10th,11th and 12th of each group.


 * Promotion
 * Top two teams of Group B1 are promoted to the ACB League.


 * He had planned a third phase of play-off, where those classified 2nd to 9th of B1 would play for the second promotion and from 3 to 10th of B2 would play to avoid two of the four relegations. However, this phase was never played due to a conflict between the clubs and the FEB on account of the number of promotions, which finally went from three to two. Thus, there were no decreases, increasing the category from 24 to 28 teams for the following season.

Promotion and relegation (pre-season)
A total of 24 teams contested the league, including 11 sides from the 1986–87 season, three relegated from the 1985–86 ACB, four promoted from the Segunda División and six Wild Cards.


 * Teams relegated from Liga ACB
 * CD Cajamadrid
 * Coronas Las Palmas
 * Metro Santa Coloma


 * Teams promoted from Segunda División
 * BC Andorra
 * Caixa Ourense
 * CB Guadalajara
 * Elosúa León


 * Wild Cards
 * Coalsa Bosco
 * Tradehi Oviedo
 * Pamesa Valencia
 * Colecor Córdoba
 * Ecoahorro Maristas
 * CB Badajoz


 * Teams that resigned to participate
 * RC Nautico sold his place to Tenerife AB
 * Seguros Caudal
 * Canoe NC
 * CB Hospitalet sold his place to Valvi Girona
 * Institución Logos sold his place to Júver Murcia

Second Round

 * The results of the first phase are maintained, therefore 12 matches are played in total.