I bought a Trailblazer 250, the guy said it was a 2003 and I put a new chain and sprockets on it. Turns out its a 2005. I put a 11/36/76 on it. is that compatible with the 2005?

 

I don't think much ever changed with the Trailblazer the whole production run. If it fits a 2005, I'm pretty sure it will fit a 2003. The only thing is that if the sprocket is a different size than stock, it will affect your gearing. A smaller one will give you better acceleration but less top speed. A bigger one will do the opposite.

 

2003 and 2005 had the same front and rear sprockets(11,36) and 76 link chain.

 

Great! thank you.