B2B, B to B, or B-to-B may refer to: Sports. B2B, a controversial and short lived class in the 1979 Sidecar World Championship. Bay to Breakers, an annual footrace in San Francisco, California on the third Sunday of May. Budapest-Bamako, now the largest amateur rally in the world, the largest rally across the Sahara and an important charity car race in Africa. Box-to-box, central midfielders who are skilled at both defending and attacking. Other uses. BtoB (band), a South Korean boy group.
https://en.wikipedia.org/wiki/B2B