The main difference between a fat bike and a mountain bike is the width of their tires. A 29er mountain bike has relatively slimmer tires compared to its counterpart, with a 3.8″-5.2″ width of tires. To accommodate such wide tires, fat bikes have wider rims. 300. 13. 47. 12. 12. 30.5. 305. The table above uses American shoe sizes as its base and gives conversions to other sizes that are correct for the top of the size, so if you are only just into a size you may need the size below that given here. US men's shoe sizes are based on a fixed scale, originating from the middle ages and updated in the .

difference between 26 27.5 and 29