Have you considered a fat bike? They are more than half an inch wider on each side than standard cranks, though they are not compatible with regular frames. If you don't like the tires you can buy/make a "Krampug" build where it's got 29er rims
__________________
Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."