The rear diff post size (the part that the cup is hooked to) is 5mm on the CRT.5, while 1/8th scale posts are 8mm...

i don't understand why not try 5mm shaft motor with steel motor gear?

Well, there have been a number of people who have tried it and the pinion doesn't last long at all despite the fact it is hardened steel. Read this thread for more information; RCM Mike even has his take on them.

ok, i think that is not a problem.
pinion gear maybe try use like SCM-21 steel materials with "Heat Treatment" process.

we have alot people convert X1CRT to BL with stock steel spur not problem.
gear not eat and great.
it's look like http://www.rcbig.idv.tw/bbs/rcbig/upload/18059-2-1.jpg

Here is some driver CRT stock gear clip.
http://www.youtube.com/watch?v=sajULgawAgo


so i think maybe gear is not a problem , this CRT.5 can more easy to convert right?

Yes, it would be much easier to convert. :)

I've been talking to Mike (owner) and we've been throwing ideas back and forth, so there IS a solution. I just want to find the "right" one.

That backflip on flat ground was pretty impressive.

Huh?

In andywpj's youtube video that he linked to (post #154), one of the cars does a wheel stand which ends up being a full backflip, I don't think I've seen that before.

They were speaking Chinese (I'm 1/2 Chinese, and can speak Mandarin fluently). The last 10 seconds or so the camera guy is saying "one more time" in reference to the backflip. :)

Looks pretty awesome. I'm hoping my .5 will do the same.

Anyone happen to know the inner diameter for the bearing used on a standard 1/8 scale center diff?

Not sure about the bearing...

What I am sure about is that those trucks in the video had spooled center diffs and kinda low gearing... man tha thing was super punchy.. but no much on top

Looky what me seee.... :004:

http://209.2.68.15:8011/pics/rcx11.jpg

Damn GD, where was that?

Look at the trash can. It says "FAIRPLEX" which would mean RCX! I wonder how long those will last.

yep... rcx good sleuth work :)

1/8 buggies/truggies use mostly 8x16mm bearings all around. The center diff is no exception :).

And I should be seeing some in person tomorrow ;). Same with BP-Revo.