First off, study the instructions..
C1 C2 C3 C4 C5 C6 C7
The Tread pattern goes |Edge|_Gap_Bump|_Gap_Ridge|_Ridge|_Ridge_Gap|_Bump_Gap_|Edge|
It is very important to remember this pattern.
Sand each piece to make sure the ejector marks are flat, otherwise your Tyre will be ruined.
Place your parts in order. DO NOT MUDDLE THEM UP.
Place glue only on the inside of the ring. you dont want glue seeping onto the tread pattern.
Carefully squeeze together to ensure a tight fit.
Be careful whilst removing the next end connectors (Part C3)
Lightly sand with 1000 Grit then brush off the dust
Lay parts out and assemble as previously done, watch out for the Tread pattern and make sure you assemble it correctly.
You will end up with two parts, One one slice thicker than the other.
Remove and clean up your selected rim.
place on the thicker piece to the back.
Add the front piece, making sure to line up with the holes..
You can leave them unstuck for ease of painting later on...