I was wondering if different foam might help as well. It's easy to find online nowadays, all different types available.
Cant' say for sure Georgesgiralt but that 160 KG number might be the firmness? I can't remember the term but they use weight to measure the firmness of foam, the bigger the number, the firmer the foam. I think it has to do with how much weight it takes to compress the foam by a certain amount.
I noticed when I got the R65 that the seat seemed incredibly more comfortable than most bikes that I have been on (haven't been on any extremely long rides yet, but very noticeable just sitting on it). Not sure if mine is original or not. I'd think that seats would be like mattresses where it's different for everyone - firm might be more comfortable for some, soft for others.
