What kind of bike? A TBR7 I'm guessing, based on your previous posts?
It should be a 14mm diameter. Same as the Hawk and its ilk as far as I know. As to why it's not going in, you need to make absolutely sure the swingarm is lined up with the holes in the frame. It'll be under spring tension from the rear shock unless you also pulled the shock out. I find it helpful to put a floor jack under the pivot point and gently lift/lower the swingarm until the holes are all lined up and you can push the bolt through.
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