Upsizing to AT tyres on the Thar, does ABS need recalibration?

Thinking of moving to bigger AT tyres on my Thar for the wet months, something like a 265 section instead of stock. Saw a Team-BHP thread on tyre upsize vs odometer/MID reading saying speedo and ABS both work off wheel rotations, so the system still expects the old rotation count. Anyone here who actually went up a size, did ABS or traction control feel off on wet tar or mud, or was it a non issue? Did you get it recalibrated at a service centre or just left it running as is?