That was the joke…
They are .405" +/- .003". 8mm spacers are too small
Bigger softer wheels will help but not completely alleviate the noise.
Pneumatic wheels are wildly more inefficient if you are just riding on sidewalks
@swagimir It’s a skateboard, dude. Don’t mean to sound rude, but this is how skateboards sound when going over cracks. Try riding some 50mm 100A wheels for awhile and then you will see how much better your Kegels are…
Your board is done. Ride it. Enjoy it.
could be fun too if you’re skilled enough and the board is light
You are right. I should stop finding out new problems 
I road on street and it is really awesome. Just have to make Nunchuck to control speed (now I’m using car transmitter) and check my VESC because it resets after 20-30 minutes of riding (maybe it overheats - there is no colling system and I use 10000mAh 6S battery pack so 60A current maybe is too high for my one).
Thank you all for help. At least I know that it should work like that
yeh, ‘brick’ layed sidewalks will be your worst nightmare… not to mention occacional other gaps (like the ones bridges have) etc… and high curbs/sidewalks, where it is impossible to get up to unless you lift the whole board up somehow… that is just the real life situation of such ‘vehicle’ in city terrain not adjusted / made for such small vehicles / transportation
So i wish u to find plenty of road space / best roads u can to enjoy riding it… otherwise just go ride in the dark or after busy traffic is gone to truly enjoy it (with good lights of course, if you do it in the dark )
I can say from experience there is still terrain types / roads where even with mountainboard tires it is not the most comfortable… one such example could be cobblestone streets (small or large rock)… but these are just bad with all vehicles I think