[MOC] The Most Ultimate Sequential Gearbox

[paave]

I've been thinking of a simple yet effective sequential gearbox for a long time, and since LEGO had released a 18T clutch + 14T gears, I've come that now it's possible to partially reveal it

It's a kind of successor of the Anto's 6NR gearbox 

The main difference is that there are no multiplier gears. There are straight up-down transitions connected left-right with equal gear ratio. With the current 6 clutch gears existing, it's possible to make 6 speeds, but to fit the 15x11 frame, only 5 speeds for now. There are still no studio files for new gears, so I used 16 gear recolored. The orange is 18T clutch, and the white is 14T. The upper 16T gear - axle - is connected to engine, the yellow connector - to wheels, the red connector - to turn drums on 45°

It will be possible to create 8 speed gearbox (or 9 with specific drums?), when LEGO releases 14T clutch + 18T, 10T clutch + 22T, and 22T clutch + 10T gears. If someone can design these parts for 3D print ready, that would be nice

All the possible gear ratios:

1. 8/24 = 0.33
2. 10/22 = 0.45
3. 12/20 = 0.6
4. 14/18 = 0.77
5. 16/16 = 1
6. 18/14 = 1.28
7. 20/12 = 1.66
8. 22/10 = 2.2
9. 24/8 = 3

I don't have all the gears needed now, but with what I have, it works well

You can use this gearbox wherever you want and I wouldn't mind to see it in the future ultimate set with probably different drums

 

Edited July 18 by paave

[danielhstahl]

You can also make a very efficient (two "axles") 6 speed plus neutral with the new gears.  It would be still be compact but longer than your solution.    

 

The new drums, alas, I think are pretty useless outside of a complex nine speed.

[1963maniac]

16 hours ago, danielhstahl said:

You can also make a very efficient (two "axles") 6 speed plus neutral with the new gears.  It would be still be compact but longer than your solution.    

I would like to see and build that!

[danielhstahl]

3 hours ago, 1963maniac said:

I would like to see and build that!

I haven't built it (even virtually) but it would be like https://rebrickable.com/mocs/MOC-201002/paave/realistic-4-speed-sequential-gearbox/#details but with the 24x8 (clutch) and 14x18 (clutch) and the three blue (motorcycle) drums with the 8 gear ratchet.

[SNIPE]

Great work, perhaps this can be the basis for a more compact 9 speed transmission for the 42232 koenigsegg set!

[paave]

On 7/18/2026 at 11:37 PM, SNIPE said:

Great work, perhaps this can be the basis for a more compact 9 speed transmission for the 42232 koenigsegg set!

Thanks!

[Anto]

That's exactly what I thought when I saw the new gears of the Koenigsegg!

On 7/17/2026 at 5:21 PM, paave said:

On this view, on the right, I think that you can find a way to use the free space to move the 16t gears inside of the frames. For instance, you can go from the green 12t (under the 20t on the right top of the image) and add:

• Free 20t - 12t - free 20t - 12t on the other axle with driving rings

For this, you would need an extra structure to hold the drums and you would need to shorten their axle, but I beleive that it's possible.