Originally Posted by Steve0000

I have a Swift and B17 imperial, the former on my commuting bike and the latter on my touring bike. The Swift has around 5K km on it and has become more comfortable as it has aged. It has no sag on it at all but I would not like to use it for touring (it is not that comfortable for long periods on the bike). The B17 has a lot of sag. I have tensioned it once but I do not wish to repeat this as I do not wish it to stretch too much. I live with the sag as it is not causing problems and is very comfortable for touring. The B17 has shaped itself well to my rear but the Swift has not shaped noticeably but it has become more comfortable.