When I was working with your model it became apparent that the outer rim itself was to blame for the mesh failure. I then did a geometry check (via 'Tools', 'Evaluate', 'Check') and it revealed 4 general faults in your model.
I reduced the element size on the outer rim and it still could not mesh. You will probably need to go back and find out what feature is producing these faults to remove them before proceeding with your simulation.
I was going to assist you - but then on inspection of the geometry I found issues from the very first steps.
1. I would place the axis of revolution in Sketch1 at the Origin.
2. You have many dimensions in Sketch1 that are not manufacturable and/or cannot be inspected. I see little point in running an analysis on something that cannot be manufactured as designed (it appears that you use auto-dimension or simply "threw on" dimensions).
3. Fillet3 results in illogical and invalid geometry. I stopped there....
Examine this in Section View.
Thank you both for your time it would appear that my newness to 3D modelling as a whole is showing I will take a look at both suggestions and see what I can do.
I have now managed to get the model to mesh I reduced the size of fillet 3 to 50mm.
I do fully understand the modelling issues contained within the wheel when it comes to the items manufacturability but it's a little late in the day to start the model again, all I can say is I now have some excellent information to use in my evaluation and luckily for me there are a lot of marks available in that section of the report I may re draw the wheel at a later date to try and solve some of the issues mentioned.
Thank you again for your time.