Very useful for those of us who build heavy vehicles!

Steered, non-driven suspension designed for truck models using 62.4 x 20 wheels, especially for heavy ones. Offers Ackermann steering geometry as well as pivot point located within wheels, resulting in their more realistic behaviour while turning, and in the possibility to place them inside a tighter structure (e.g. mudguards). Step-by-step instruction provided.

Lego 62.4 x 20 wheels are very popular with medium-sized models, and extremely popular with models of regular trucks. Having built a number of such trucks, and with more models to come, I was looking for a solution for a front axle that would solve two most common problems occurring with these wheels: the steering pivot point being located outside the wheel and the steering shaft being stressed under model’s weight. This is what I came up with.

Full article, including photo instructions, can be found here.

fmmjqtft made the interesting comment that this suspension as-is requires the rear axle to be located only 14 studs behind the front axle for true Ackermann steering, which is a bit short for heavy trucks. If you replace the two axle and pin connectors by something that's 5 studs long, there can be 28 studs between the axles (for true Ackermann steering).

Edited November 8, 201014 yr by jantjeuh

Technically it is good, but it is too spacy for me if you want to include some detail in the engine bay.

a little bit fat and ugly and with a big stability bug

i have made this on small trucks, and it is not solid. with every steering move it will go more loosely.

i think this looks better and is more stable. the pivotpoint is not "in" the wheel. but in real trucks this is the same. there is only a problem: you must use a "round to cross" bush, what is a little bit wobbly, or you use a axle 3 with knob and cut the knob without cutting the stop . the second version is not acceptable for Hardcore lego fans, but i can live with it.

That looks pretty sophisticated.. I guess you used that in your own trucks? How did it perform?

Edit: with 'round to cross bush' you mean this little fella?

Edited November 9, 201014 yr by jantjeuh

oh my goodness, bolt is the word i had want to say. sorry.

yes i use the axle in my longtime project

i think it performs great