rear tire size

[Dale Sonnenschein]

What size rear tire does a 400x18 change over to in the new sizes?  Its for a 73 jackpiner.

73 Jackpiner
73 Husky 360 WR/RT
76 Husky WR360
78 husky cr250
10 ktm 250xc
02 bmw r1150r

[brian kirby]

Depends on the brand, some 100/100-18s would be correct and some 110/100-18s would be correct. The closest tire you can get today to the 400-18 Metzler is the Pirelli MT16 110/110-18.

Brian