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The tire and wheels are an exact fit in the CAD. If there's 10mm between then something is wrong. Sounds like you put two inner wheel pieces together.

Here's a screenshot from the tire profile and whee parts:
https://thingiverse-production-new.s3.amazonaws.com/renders/f4/9d/3b/31/81/5d2b0d8d1993100251263f061251f26f_preview_featured.jpg