J Tires

Wheel sizes on the J series are 2.75" front and 3.50" rear.
Stock tire sizes are 110/70-17 front and 130/70-17 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

Bridgestone BT45

Front: 110/70-17, 110/80-17 Rear: 130/70-17, 130/80-17

Dunlop GT501

Note: The GT501s that were OEM on some 2008 bikes, in sizes 130/70-17 rear and 110/70-17 front, are only available if you live in Australia or Great Britain.

There are no recommendations for GT501s as of Feb 15, 2009.

110/80-17 Recc rim: 2.50

140/80-17 Recc rim: 3.50

Elmer's note: Avon Roadrider: 140/70-17 V Recc rim: 3.75 alternate: 3.50 - 4.50
Note 2: Metzeler ME880 rear only 140/80-17

Metzeler Lasertec

Front: 110/70-17, 110/80-17 Rear: 130/70-17, 130/80-17

Pirelli MT 75

The availability of these sizes in the US has yet to be confirmed.

Front: 110/70-17, 110/80-17 Rear: 130/70-17, 130/80-17

Pirelli Sport Demon

Front: 110/70-17, 110/80-17 Rear: 130/70-17, 130/80-17

Touring bias-ply

Avon Roadrider

Front: 110/70-17, 110/80-17 Rear: 130/70-17, 130/80-17

Kenda K671

Front: 110/70-17, 110/80-17 Rear: 130/70-17, no 80-series rear

Michelin Pilot Activ

Front: 110/70-17, 110/80-17 Rear: 130/70-17, 130/80-17

IRC Roadwinner RX-01

Front: 110/70-17, 110/80-17 Rear: 130/70-17, 130/80-17

Don't put IRC tires on your bike. Just don't.