wheel adapters

Here's some hubs for Traxxas 14mm to the 17mm, so you can use 1/8 wheels and tires. Hope this helps.

http://www.hobbyetc.com/cgi-bin/item.cgi?part_id=47945

Sorry, I re-read your posting so you need 12mm to 17mm. I have a link to that somewhere. I'll start looking...