Porteur racks with expansive platform have become a great option for messengers or even folks that carry the occasional pizza or 6-pack of paper towels. Sometimes the platform can be inconvenient in tight spaces or crowds. The PortFolder can fold down its platform with the push of a couple of buttons. Aluminum construction Platform: 16" w x 13.5" d Adjustable height: Fits tires 26" to 29 x 2.25" Fits best on bikes with 72 degree head angle or slacker (Probably yes: cruisers touring, hybrids, some CX and gravel bikes; Probably not: Road race bikes or track bikes) When folded, the rack can fit some pannier bags. Best with bags with re-positionable hooks. Weight: 830 grams