Image
e*thirteen's new 40 or 42-tooth cassette add-on allows you to get a greater gear range out of your 10-speed SRAM or Shimano cassette. It retails for a little less than most of the competition at $70, and weighs 70 or 77 grams. Pairing it with the $55 narrow/wide tooth profile of the Guidering M makes for a good 1X drivetrain solution.
Credit
Brandon Turman // Vital MTB
