Originally Posted by prorace

TRG Superion or super soft, are intended for qualifying.
Try rcmarket.com.hk for TRG medium rears.

Also, you can fit 104 wheels on your 103 with a little modding.

You will need a 2-3mm spacer between the motor mount and the T-Bar, found on F103Gt T Parts 51229 "part 2"

For the front you'll need to shave 2 mm in the upper portion of the uprigth to allow it to mount up.

Also, you'll need 104 front wheel bearings, because are bigger than 103's