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It is not suspension. It is a way to allow the rear end of the bike to flex a bit more than usual without putting huge stresses on a carbon T-joint. This might be useful if you have a really rigid seatpost (i.e. dropper) or are underbiking. Bear in mind that the front of the bike already flexes very differently to the rear. A straight fork with a stem and handlebar =/= a closed triangle with a seatpost on top.
Wondered if anyone had any experience of a Cannondale Topstone gravel bike using their ‘Kingpin’ rear suspension system. Not a lot of user reviews on line that I could find with opinions on it.
Long story short, am getting a C2W voucher this month for up to 3.5K, was looking at a Ribble gravel Ti , but after seeing the red flags on their (lack of) accounts submission to Companies House this week I am shying away from placing an order with them and after further research got interested in a Cannondale carbon Topstone in same price bracket, but have not seen anything like this Kingpin suspension before. In theory it looks appropriate especially for a gravel bike that is likely to be used mostly off-road rather than as a do-it-all bike.
Thanks for any input.