Tyres numbers in (brackets)?

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I just got a new Avon tire for my front and had the forks rebuilt with progressive springs. I asked the guy at the motorcycle shop to check out the back tire and if he thought it needed to be replaced I'd do it. The guy *sells tires*. Said the back tire was fine, lots of life left in it, there's no checking, dry rot, hardening, yadda yadda. My bro in laws that ride looked and it and said it looks great. The date code on it is 1089, March 1989. It's a Bridgestone Spitfire 11R that has somehow side stepped the space-time continuum or something. I'm imaging some early 90's Gen X-er jamming out to Nirvana and accidentally riding my XS11 through a worm hole into the future. I've put 660 miles on it this year. It gets a little squirrely in the cracks but otherwise rides fine. I was trying to look up the tire but there's very little info on it because (it predates the internet and) it's been updated by several models, but I did find one guy trying to sell one on ebay Might not be as old as mine, but it's still gotta be old, like swing in the back yard for the kids old.

I'm hoping to get a new back tire in the fall, but I need to get this new job lined up and get a couple checks rolling in first.

When I got my bike, it had the exact same tire as you have and it looked nearly brand new. Yours was made in Oct of '89 and mine had a date stamp of May of '89. That is the tire that blew out without warning on the way to work just as I hit 70mph. Luckily, it didn't happen in a curve. I'm thinking that you'd probably think the odds OK on a nice little game of Russian Roullette as well.