They're standard-ish. My road bike and mountain bike are both 12 years old, which means I've learned the ins and outs. SRAM likes to abandon old derailleur tech

They're standard-ish. My road bike and mountain bike are both 12 years old, which means I've learned the ins and outs. SRAM likes to abandon old derailleur tech, but SRAM and shimano chain spacing are MOSTLY similar. On road bikes, the Shimano 9/10spd are the same, if I remember correctly. I think the 11 and 12 speed stuff use narrower chains, BUT conveniently front chainring spacing seems to not matter a whole lot. 10 speed ultegra chains and cassettes work fine with an "11 speed" generation front crank, thankfully.