Giant QR Seatpost Clamp W/ Rack Mount - Giant University City | Charlotte, NC | Bike Shop
Giant contend Seat-Clamp problem. Someone overtightened the bolt and now it's sheared. I'm riding about with my seat way too low. Any ideas to fix. : r/bikewrench
original D shape aluminum alloy bike seat post mountain bike special-shaped seat tube giant bike seatpost - AliExpress
GIANT ISP SEAT POST CLAMP ADAPTOR NEW 950839 | eBay