HI all - need some suggestions if possible! I own a 5/6 yr old pro connect. For some reason unknown even to myself, I replaced it's 700x35c tyres with 700x28 Schwalbe Marathons. I believe (imagine?!) this resulted in the bike rolling better, being faster, climbing hills easier and has improved battery efficiency. The big downside is, of course, the bone-crunching, teeth rattling experience when riding over rough patches on road surfaces! Can anyone suggest a good shock absorbing seat post (believe they are called 'slung'?) that would fit on the pro connect? Many thanks! Tom