You have to split the weight between the two tires, i would guess that the rear has more weight on it when loaded, i'd have to get two scales to weigh it to see the difference between the two tires, but when i add 160 pounds to the bike, the rear sags more than the front, so without doing the math that i can't do, i'm guessing 60% total weight on the back with 40% on the front,, like i said, just a rough guess, someone with two scales could really give the right ratio between the back and front.
2016 wee strom -- when in doubt, give it gas
2009 KLR 50k
2005 KLR 25k stolen
1982 XJ1100 200k miles and going, only oil and plugs
1976 XS750 special
1966 international pickup, Harley retrieval vehicle