The X0 DH rear derailleur uses the same construction and carbon cage as the standard version, but a shorter P knuckle allows it to track close ratio cassettes closer.br>br>span style='font-size:19px'>X0 DH rear derailleur details:/span>br>br>- A shorter P knuckle lets the upper pulley wheel track a tight ratio DH cassette closerbr>- Will work with up to a 28 tooth cogbr>- Works with any SRAM 10 speed shifterbr>- Cage length is the same as a standard X0 short cage unitbr>- 2 graphic colors: New Silver and Redbr>- 203 gramsbr>- MSRP $234 USD