I have a YM1700, and am looking for chains for the upcoming winter. I have the original jap tyres with the big cleats - size 8.4/8 - 24. I spoke to a supplier, and they have chains for tyre size 8.3/8 - 24. So my question is, what do the numbers mean (obviously the 24 is the rim diameter), and will chains for 8.3 be suitable for 8.4?