Burgtec Seat Clamp - 34.9mm - Purple Rain YGroup_7033413533741 They use a captive steel

They use a captive steel washer under the head which reduces friction on the dropout face

Awesome airflow

Reinforced Steel Core

It’s 520% range has been optimized with larger 38 and 44-teeth cogs prior to the 52-tooth cog for improved gear steps in the low end (compared to the Eagle drivetrain 10-52-tooth cassette)

the SW-15 features a comfortable

Burgtec Seat Clamp - 34.9mm - Purple Rain YGroup_7033413533741 They use a captive steelEffortlessly subtle and minimal design to keep your seat post secure and add the perfect last splash of colour to your build. No edge left unsmoothed, and no detail overlooked, even the split in the back has been machined wide enough so you don't need to detach your dropper cable which makes installation a breeze. A stainless steel bolt gives reliable clamping power and ensures no rust even in the grimmest conditions. Features Stainless Steel Hardware