Mini Rock Crawlers
17/03/26(Tue)13:54


I guess I should start a new thread for the mini rock crawlers, so here we are :D

In the photo we have the original Traxxas TRX4M Chassis and a Carbon Fibre Competition Style Chassis.

I'll update in this thread as parts show up and the builds progress. They really are super tiny but should still be fun and capable rock crawlers.

Parts are cheap and there's a huge array of 3rd party bits to put on these cars. It should be fun trying out different things.

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25/03/26(Wed)13:12

>>39656 Yeah, the cheeky little buggers tried to escape! XD

24/03/26(Tue)08:40

EEK! THEY LIVE!

23/03/26(Mon)12:19
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Have you ever wondered why they call them rock crawlers?

20/03/26(Fri)12:50
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This is the body I'm going to put on the stock chassis. It's a close copy of a Toyota FJ40. I'm also thinking I'll 3D print some bodies for these cars in the future.

20/03/26(Fri)12:48
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The stock cars use 180 brushed motors, but performance at low rpm is apparently not great. Running a brushless motor is preferable.

I've ordered a super cheap open-source ESC from China, called an AM32, and a cheap brushless motor to try out. All in about £24!

The stock ESC is built in to the Traxxas ECM, which also contains the receiver. I don't want to use the Traxxas radio gear so I'm looking to see if I can find a cheap little brushed esc so I can check all that out.

The standard battery is a 750mah 7.4V lipo. The best performance using a brushless motor is to gear down and use 3S, 11.1V lipo instead. I'm not sure how room there will be under the body of the stock chassis currently so I'm waiting for that to arrive so I can measure up and find a battery to fit.

18/03/26(Wed)16:17

Do they normally use brushed or brushless motors? And what battery will fit?

18/03/26(Wed)14:46
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Transmission for the stock chassis

It's a stock transmission and plastic gears, but I've already replaced the sintered bushings with ball-race bearings. I have some metal gears ordered too which are a different ratio and will be better for slow rock crawling than these stock gears.

18/03/26(Wed)14:43
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The stock chassis gets links

But no axles to link to currently :D

The links for the carbon chassis arrived too, but I can't fit them until the skid plate arrives for that one.

17/03/26(Tue)21:40

Neat!

17/03/26(Tue)13:54
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17/03/26(Tue)13:54
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