if the truck is ready, i don't use connectors, because they need too much room, even the JST.
Best thing is soldering with (ultra) thin wires.
There are two supplier with different type of tires.
Wiking
Wiking part# 0140226 Breitreifen für Fendt Vario
This ist the correspondig modell
http://web94.go-server.com/catalog/p...oducts_id/7659
Do a search for "Wi-0140226" at
http://www.tyrotoys.de/en/index.php?
Busch
http://web94.go-server.com/catalog/p...fee793bd3665c6
I am sure you can get them at different shops. These are only the first i found!
diets - maybe they sell them in the staates as well?