Sourced some suppliers for Doomwheels components in UK, that you might like to use:

Hubs:
http://www.kmxkarts.co.uk/kclass.html
Tel: 023 92 379 333
Plastic, 8 spoke, 12 " wheel hubs
£9 each

Tyres:
Chariots All Terain PushChairs
TeL: 01363 881110

http://www.pushchairs.co.uk/acatalog/miscellaneous_spares.html

4 x 12" Thorn Resistant Inner Tubes
£20

4 x 12" Chunky Off Road Tyres
£24


The tyres fit perfectly on the wheels
Both suppliers will ship to you.

If you are on a tighter budget, purchase the full wheel, tubes and tyres in one go from the USA on
www.northerntool.com

Have a blast!

Wzrd