new tires

i have a race tomorow (oly) and i have put 1,100 miles on my tri bike tires... the middle of the tire is flat.

Do you think i should put my road bike tires that have 600 on them. but the back one is flat from using it on my trianer or...

should i go buy some new ones for tomorow? i wont get a chance to ride on them today. it sounds like kind of a bad idea. to me...

OR i could put the front tire of my road bike on to the back of the tri bike....

or should i just not worry abotu it and get some new ones next week.

(pre day race nerves... my training was solid so now i just have tec stuff to worry about)