I said it was the builders crazy idea when he built the rafty as it looks homemade not the design thats crazy. Anyway the S-Bike is crazy, its weak due to no seat stays, the chainstay can and has broken on some S-bikes. The Trimble however due to glassfibre or carbon fibre is as tough as old boots and gets away without the seat stays. Note the rafty does have seat stays, perhaps the designer thought I'm not making the same mistakes S-bike made.