What is "boston-montreal-boston"

Boston–Montreal–Boston (BMB) was a 1200 km randonnée bicycle ride held on an out-and-back course between the vicinity of Boston, Massachusetts (US) and Huntingdon, Quebec (Canada). It was held every year from 1988 through 2006 except for Paris–Brest–Paris years.

BMB was sometimes regarded as the North American equivalent of Paris–Brest–Paris.

It was a noncompetitive endurance bike event.