Combines DualsIJ Which size

Our walker has metric equivalants to 18.4-38s and they are really too short. It would be nice to get into a 18.4-42. You can always run a taller back tire and that is always a good thing to think about as far as weight with hopper extensions etc. We also run metric equivalants to 20.8-38s on our STS and they seem to be really about right in size although I prefer the taller tires if I can help it.

20.8x38 or 18.4x42 are both about the same height as your 30.5x32's. Either would work fine.

We have a set of each for our 9650 Walkers. I prefer the taller size. It has a larger footprint. If you have the adjustable rear axle, like we do, you can lift the rear end up a bit to make the walker steeper. We always run our combines leaning forward a bit. Watch out for the rim sizes. Different final drives take different rims.