The ground clearance and the motor from hanger clearance are the main reasons for the design. It’ll probably take a bit of testing prototypes to determine just how the smaller gears transfer torque.
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Okay at least I got that much lol, nice work eager to see how they fare in real world use. I should’ve looked up @MoeStooge’s build sooner lol
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Additional moving parts means another point of maintenance.
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I can’t say just yet since we haven’t made it yet, but in terms of calculations, the idler gear actually doesn’t affect the ratio from the first and last gear I found out. What’s yet to be determined is if it’ll be better to have an idler gear that’s exactly in between the sizes of the other two gears to keep equal torque applied to both sides, or if it’ll be better to just have two of the gears be the same size. All will revealed after testing 
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I’d also like to point out that @idea has some very awesome looking gear drives that’s he’s made and been testing for awhile now. I’ve messaged him a few times trying to get him to sell me a set, as his do work with PU wheels and so far as I’m aware they don’t have clearance issues, but I can’t say one way or the other as he doesn’t want to make claims without the testing to back it. These look very nice though!
He has a few other drives in the works as well, though this is the one I’ve been most interested in.
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Stunning! And the whole assembly is extremely compact with the 50mm motors that’s something I’d want for a compact/lightweight build! Is he using POM or steel?
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The gears are POM, case is steel.
Scorer for Derby days had Avg speed @ 46mph (74kph) for the 4.6 miles race on 56mph setup. Esc temp 135deg f (57c). Inrunner Motors cool enough to grab. Any doubts about the tourqe and speed if inrunners In the same package, the vid should clear it up.
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Yeah I messaged him about it and he also gets amazing range its crazy. Very efficient from his uses
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Seems like a very good option for compact builds as well I like the small diameter of inrunners and I believe you can run them with good performance just with a 4s right? How much current do they draw? I’d be curious to see if tiny 4s packs could sustain this setup that’ll mean insanely compact and light setups. How is the noise?
Not sure if the motors can affect the noise much when used with gear drives
Yeah I think unless you’re dealing with very well engineered helicals, such as @nowind has done (damn those are so crazy silent it’s incredible!) the louder sounds will be coming from the gears, not the motors… If for some reason the motor is noisier, you probably have bigger problems, lol 
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I’ve only seen photos of them reverse mounted though but they look really low to the ground or it may just be the perspective of the camera that may be doing that. Im all for lowered decks though for better stability
Well I’m asking about the noise since I believe the jed board uses gears and is super noisy (probably the noisiest complete esk8 on the market imo) and I’m not sure if it’s the gears or the motor. I’ve personally heard inrunners in rc planes and they’re very high pitched so I don’t know how it translate to esk8 in terms of noise
Looks like they’re almost touching the hanger so 50mm is probably the biggest your can fit and they’re mounted on evolve trucks so I’m not sure how it’s gonna translate to other trucks
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Looks pretty amazing.
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In terms of gear drive I don’t think the type of motor affects the sound much if at all as it still engages with the gears the same way which imo will be significantly more audible than the motor regardless if inrunner or outrunner
Edit: Even with the top notch Helicals that @nowind produces I still think that sound does come from the gears albeit way way less audible.
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