We had to raise the fender on this tractor to get 26-12-12 ag tires to work.
You will have clearence problems where the fender angles down to the foot rest.
I would consider getting 23-10.50-12 ag tires for your 1650. You have ther correct rims for 23-10.50-12 ag tires. The best rim for 23-8.50-12 tires is a 7 inch wide rims.
This was my plow crew in 2008:
Rear view:
My Son's 86:
My 100. It has 23-8.50-12 tires on it.
My 149. It has 23-8.50-12 tires on it. I run a dual on the left side.
Which tire works best???
The 23-8.50-12 gives me the best traction when moving earth and snow.The wider tires will need more weight to get the same amount weight (pounds per square inch) to the ground. I have plowed snow with 10.50 and 8.50 ags.....8.50 ags had better traction.
My 149 has a set of 23-10.50-12 turfs that I run during the summer and 23-8.50-12 ag tires I use for plow days and snow removal in the winter time. I don't like to run ag tires on the road....the road is hard on the bars/lugs on a ag tire.