The only non-SRAM part I’m using is a Wolftooth chainring, the Drop-Stop B 104 BCD 34T, which is made to be compatible with the new SRAM Transmission.
104 BCD chainring for SRAM and Shimano Drop-Stop wide/narrow sprocket
www.wolftoothcomponents.com
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I also replaced the OEM chainring bolts with Wolftooth ones. The OEM bolts are the old Shimano style that needs a special chainring bolt tool to remove the bolts, and which are not good because they strip easily. The Wolftooth bolts use two hex keys which is a much better design.
Alloy super light 6mm chainring bolt specifically designed for mounting single chainrings like the Wolf Tooth Drop-Stop® chainrings
www.wolftoothcomponents.com
Everything else is the new SRAM: derailleur, cassette, chain and shifter pod. My LBS sold me one of their XO upgrade kits minus the cranks/BB.
If you don’t want the Wolftooth chainring, SRAM has a T-Type chainring with 104 BCD in their catalog, but my LBS didn’t know when they could get one so I decided to go with the Wolftooth because it’s available now.
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