Tallacs B2 Dual Cage incorporates two bottle cages within a single mount. The two cages are stacked with an the top cage offset for clearance of the seat tube mounted bottle cage. The aluminum models top cage has an adjustable offset. Weight is at 114 grams. The B2 Dual Cage offers additional carrying capacity for bikes with only one cage mount (comfort bikes, full suspension bikes, recumbent and exercise equipment). No modification or brackets are required to mount the product to bike frame.