Quote Originally Posted by trista View Post
damn, 37 views and no one has advice....

maybe if i rephrase the question....

my sit bones are:
17 cm on the very outside to outside
82mm on the very inside to inside
and 133mm from center to center

Would I be best to start with a 143 or 155 saddle?
Ischial Tuberosity Spacing among women:
5th percentile 112 mm
50th percentile 130 mm
95th percentile 148 mm

I guess I'll dissent with some of the other posters a little and suggest you might already be on (nearly?) the right saddle. Here's my reasoning:

1. The Bontrager R1 saddle that come stock on Trek's WSD bikes nowadays is their mid-width shell, which is 150mm. It looks like that's what you have. (The width should be molded into the plastic shell on one of the rail sockets in the back.) Bontrager aimed that width at the 50% percentile.

2. You measured your sit bones center to center at 133mm. That's only 3mm more than 50% percentile, which is 130mm for women.

Based on 1 and 2, I'd say the width is about right.

3. You have no major discomfort issues.

So it might not be too bad!

That said, the stock Bontrager R1 saddle is a bit squishy. If you generally like it in other ways (IMHO it's fairly T shaped, it has a groove in the middle, etc.) then consider trying one of the Bontrager aftermarket versions of this saddle. They're called inForm. The inForm R is a little firmer than yours, and the inForm RL slightly firmer still.