Ouch!!! I agree with xdiver86, you should look into getting that tire sectioned. I do field service mechanic'in on heavy equipment, and we have it done to loader tires all the time. At least then you would have a good spare for the future. Most large commercial tire places can do a section job for you. costs about a quarter to half what a new tire costs. It is kind of like a recap except for the sidewall.