With a large 14-tooth X-Sync lower pulley it is matched perfectly for those whopping 11-50T and 10-50T cassettes

The tips open from 21mm down to 2mm (centre to centre)

then this product is for you

XTR BR-M9120

Clamping diameter/bore: Available in both 31

Ergon SM Women's MTB Sport Gel Saddle - Stealth Black - M-L 155mm PLP|Model Year With a large 14-tooth X-SyncThe Ergon SM Women's MTB Sport Gel saddle is specifically designed to provide extra comfort with large gel pads placed where you need them. It features a cutout for pressure relief, sportive comfort padding and a flat rear section to allow freedom of movement. All these features make this a great saddle for Touring, All Mountain and Enduro. Specs: Available in a Medium (143mm) or Large (155mm) 261mm long and weighs approx: 275 grams Nylon composite