Wheels for bike avatar

I am riding on level 15 but still unable to display wheels on my avatar ? How do I proceed ?

There are different ways to use Zwift. In Zwft, go menu, then customize, you’ll see your rider and bike. Click wheels icon.

That’s the standard procedure and does not work for wheels, any unlocked wheels.

At level 15 you should have about 4 different wheels to choose from: http://titaniumgeek.com/zwift-user-manual-unofficial-running-updates/#gear

I can change frames, shirts, facial hair…but no wheels for my bike at level 15 although different sets are unlocked.