J Tires
Wheel sizes on the J series are 2.75" front and 3.50" rear
Radials: Your editor checked all the major tire manufacturer websites and none of them had any radials recommended for the (smallish) rim sizes on the EX250J, especially on the rear. There were one or two that said you could put a 110/70ZR-17 on the front, but none had a compatible rear. Do not combine one radial and one bias-ply tire.
The one exception to this is the Bridgestone BT090, which is a DOT-approved race tire and should only be considered for the track. These are usually only available from racing-oriented distributors.
Sport bias-ply
front 110/70-17 rear 130/70-17
Bridgestone BT45 / bias ply / $$$
110/70-17 H (3.00)2.50-3.50 110/80-17 V (2.50)2.50-3.00
130/70-17 H (3.50)3.00-4.00 130/80-17 H (3.00)2.50-3.50 140/70-17 H (4.00)3.50-4.50 140/80-17 V (3.50)2.75-3.75
Dunlop GT501 / bias ply / $$$
Metzler Lasertec / bias ply / $$$
Pirelli MT 75 / bias ply / $$
Pirelli Sport Demon / bias ply / $$$
Touring bias-ply
110/70-17 54V Recc rim: 3.00 alternate: 2.75 - 3.50
110/80-17 57V Recc rim: 2.50 alternate: 2.15 - 3.00
130/70-17 62V Recc rim: 3.50 alternate: 3.00 - 4.00
130/80-17 65V Recc rim: 3.00 alternate: 2.50 - 3.50
140/70-17 66V Recc rim: 3.75 alternate: 3.50 - 4.50
140/80-17 69V Recc rim: 3.50 alternate: 2.75 - 3.75
Kenda K671 / bias ply / $
Metzeler ME880 / bias / $$$ / rear only 140/80-17
Michelin Pilot Activ / bias / $$
IRC Roadwinner RX-01 / bias / $$
Don't put IRC tires on your bike. Just don't.
