I would just like to add to this thread from some experience I've had with my RTR mad force. I bought some LST2 Integy extended 23mm hex hubs and I've worked a few things out for us noobies:
1)The RTR mad force comes with 6mm axles (measured at the threaded point). The unthreaded point of this axle is 8mm.
2) 1/8 buggy output shaft/axles have no thread on them. They are a smooth shaft, measuring 8mm in diameter all the way. The hex system works by housing the pin in the wheel hex which has a threaded part for the wheel nut. This is one of the reasons you have to swap axles on the RTR mad force for use with 17mm items.
3)The drive pin (the pin inside each hex which drive the wheels) come in three sizes for all R/C as far as I know, 12mm, 17mm and the 23mm. The RTR mad force has the 12mm ones for 14mm hexes.
4) You can get various hex sizes (14,15,17,18,19,20,23) but they are designed to fit 8mm 1/8 buggy smooth shafts or 6mm threaded shafts with either a 12mm pin,17mm pin or 23mm pin.
5)Have a look at pics for what hex/extensions you get. An advertisement might say 17mm hex conversion but the hex works with 12mm pins. BEWARE OF MODELS WHICH HAVE CHANGED THEIR HEX/SHAFT SIZE AT SOME POINT,I.E. SAVAGE 21 & SAVAGE X4.6 OR LST & LST2 OR MAD FORCE KIT & MAD FORCE RTR.
6)Most extenders use a rubber ring to hold the drive pin in place. If they do not use the pin that comes with the kit they are designed for, they should include new pins in the pack.
There, I hope that helps everyone.
(Last edited by Demon Knight : 10.14.07 at 6:36 am)
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