Disc Brake Bicycle Road Bike Quick Release Alloy Rear Rack Carrier Pannier Suit for Disc brake bike and V brake Bike Material: Aluminum Alloy Size: Rack platform: 355mm x 145mm; Main Post: 540mm Max Capacity: Manufacturer states 25kg or 9kg(when only install via main girder on seatpost); In fact it can carry over 60kg as we tested. But not suggest long time carrying over 60kg. Fits 15"~20" MTB, All 26" ~29" wheel bike can install it Color: Black