Originally Posted by
sloar
42t chainring
42x15-40 covers a very similar range to 34x11-32 or 11-34…not identical, but in the same ballpark. Both 11-32 & 11-34 cassettes are fairly common. Depending on the bolt pattern on your 1x crank (and frame clearances) there is a chance you can find a 34t ring that will fit.