The saddle you have is probably the Affinity R, which is the most padded version. If the size and shape is otherwise good, you can get the RL or RXL , which have less padding. The RXL is the firmest, but is also expensive and has different (carbon) rails which will require a different seatpost clamp due to their shape.
If your LBS sells Trek bikes, they should also carry the Bontrager saddles. Or you can get one from http://www.bontrager.com/products/components/saddles. They offer a 30-day unconditional guarantee.
As for determining the size of your current saddle, measure at the widest part. It would be either 134, 144 or 154 mm, if your bike is a WSD model.
BTW I think if you look at the specs for your bike you can tell which version of the Affinity you have -- I think "Affinity 1" on the spec list means it's the Affinity R and Affinity 2 means RL.
Last edited by ny biker; 09-23-2013 at 01:53 PM.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles