whats the biggest mud tire i can put on my 300ex. ( no foot carriers)

 

if you take off the bck fenders you can put on 29inch vampires if you want all you need to do is unbolt the seat from the plastic and snap the seat back on . but with fenders probably a 25 any bigger and it would probably rub on the plastic when the rear shock sagged . also you will want a BIGGER rear sprocket if you run 25 inch tires 12/41 should be a good gear ratio . hope i helped