gearcased, The wire dia. is .196", the vertical section going into the fuselage wooden blocks is about 1" to 1.125" (can't measure as my plane is assembled), the horz. section in the slot across the bottom of the fuselage is 4.5", the down angled section is 6", and the horz. section where the wheel mounts is about 1.250" (can't get accurate measurement with wheels on). Hope this helps. Just make the vert. section long enough to go all the way thru the mount blocks, and the horz. wheel section as needed for the wheels you are using. BTY, Tower lists replacement main gear for the Tower J-3 ARF (I believe to be the same as the Great Planes ARF) using part # LXFBMN or # TOWA4041 @ $5.99 with a stock status of "late Sept". The G.P. J-3 Cub ARF is a great flyer, enjoy.