The North Shore Billet Spider allows the use of smaller chainring combination like a 22/32T or 24/34T with 9 speed 104 BCD chainrings. North Shore Billet made sure the distance between the rings and the distance from the center of the bottom bracket is the same as the 120 BCD spider to keep the set-up simple and shifting precise.
'12 Spearfish came with S1400 PF30 cranks w 39x26 gears, and SRAM doesnt make a version of that crank with 36x22 gears. SRAM Guy at DirtFest said "get an X-9 BB30 spider (looked in his phone-) we're out of stock, but try THESE guys" and gave me a link for North Shore Billet's version, which fits the S1400 crank perfectly-S1400 appears to be a cheaper OEM version on an X-9.
Like the other reviewer I have a S1400 that came on my Devinci Atlas. The only difference is mine is a regular GXP. This bike of mine has a press fit bb and no ISCG tabs. So my only options was no protection, get the Sram spider/chainring/bash guard combo or this with my own bash guard. It fit perfect and now I can run a outer bash guard on my bike.
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