Like many high-end race bikes, Ridley has opted for a skinny 27.2mm seatpost to enhance comfort on the Helium SLX without compromising the stiffness of the frame. What it hasn’t opted for is an internal seat clamp, preferring to stick with a traditional collar instead.
It may not be as slick-looking, and it slightly reduces the amount of flex in the seatpost, but a good old-fashioned seat collar has certain advantages over an internal clamp.
It’s far less fiddly when it comes to adjusting seat height, and it won’t accidentally drop inside your seat tube and get jammed. These are important considerations for anyone who likes to travel with their bike.