Its because like me, you changed the tires from 40mm wide to 50mm wide (Keuzotter gives also 2.21 for 52x32 with 40mm tires) and for this reason, I moved to a 50t chainring.

With the original 9-32 cassette and 42t chainring you can have 6.7-1.87, not so far from what is obtained with a double chainring.