Hi just go o MTH website and order the size you need there much better tires then Lionell ever was!
TRACTION TIRE USE CHART_REVISED.xlsx (mthpartsandsales.com)
MTH Electric Trains (mthpartsandsales.com)
here is the MTH traction tire chart
Alan
p.s. you probably need DE0000025 part number 24.4 mm!