Yes, 5" diameter, 125mm width one piece rims
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So I did hack together some extenders with an angled grinder, a dremel, and a drill.
And I am not so sure what to think now.
First I made the truck drop through - this was wayyy to low. Scraping easily.
Then top mounted it - in hindsight should have skipped the drop through cutout.
This doesn’t scrape without flex, but the deck flex quite a bit. Note, only the front is mounted so it will sit a bit lower still. So probably would borderline scrape.
However, I am not a huge fan of the feel that I get from standing below the axle so deep, while standing on the board in room. It feels like the truck is progressive. I could try cone / cone, fatcone / fatcone maybe to get rid of this. Is this a good idea though? Not sure. Also, maybe it feel different when moving. I don’t know. Need to extend phase wires to be able to roll like this.
I am definitely considering bringing the trucks closer back to my feet now, instead of prioritizing being closer to the ground.
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Wonder if it’s because when you start getting to the edges of travel you’ve having to “lift” your body weight (your body weight wants the board to “fall” back to center?)
Would be very curious how such a low ride height would feel around high-g corners, especially fast ones.
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Thinking about it more, maybe the progressiveness is from the tires themselves, as they literally glue themselves down to my floor from the weight of the board already. And I’m feeling it now more because I am not limited my wheelbite anymore
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Hmm maybe that too. So much room for experimentation, but I’m a little worried because this is the part that’s gonna make it or break it 
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Put on the front and rear extenders.
She’s lowwwww. Gotta mount the alu plates below the deck for an extra 10mm ground clearance. Scraping right now.
Wheelbase measures 120cm 
I was running 37.5+12.5 angles at 106cm, so going to try 42.5+15 now. So glad the new front baseplate is 5 degree now!
Also we’ve got an ultraboard here! Technically after I raise 10mm ride height, the racebox will be scraping. But that’s removable with velcro and non essential to ride the board, so I’d still count that as an ultraboard.
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You’ve probably thought about it already but
can you mount the motors inward to keep shorter phase wires, at least the back motors so you have more weight forwards for accelerating hard.
Clearances wouldn’t work out, and even though it’s a track board I prefer not to have the motors too close the ground
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Some good progress today:
Pinions swapped to 12T from 22T, so I’ll finally see how much extra power these tires eat up.
Remounted the extenders under the deck, meaning I have okay ground clearance now. And turns out the previous wiring was just about long enough with routing the cable differently.
The electrical tape over the 90 degree extender bit is temporary, I’d probably grind that alu to a 45 degree angle whenever I have time, if I chose to stay with this cable routing.
Unfortunately deck flex is quite a lot from all the extra wheelbase (plus the swiss chese), so I have to make the steel tube reinforcements asap. Hopefully I can have some good progress on that tomorrow, but it’s gonna be a busy day so we will see.
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Spent most of the day welding together this chassis
Took some stainless steel antisink plates I had laying around and welded 25x25mm Q195 steel square tubing to it. At like 80% into the welding I glanced over my gas tube and realized I had it closed… Lmao. So 80% of the welds look shit and were a struggle, but I got penetration at least so not too worried. The remaining 20% actually looks decent when I turned on the gas 
Then I gave it a coat of metallic grey paint
Mounted it up to the deck
Ride height is now decently low and I even have about a finger clearance when turning - means I might be able to go a bit lower even but honestly don’t know if I want to.
Just need to reconnect the phase wires and then it’s rideable! I also want to cut an ABS sheet to cover up the wires on the bottom
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You are moving and grooving dude…
Makes all my tinkering look so easy…
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I like this project man! Excited for you
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Make a skid plate for that frame and you essentially have a bottom enclosure for your cables.
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You seem to already have a lot of experience with large/heavy wheels and tires, but how much does this wheel and tire combination weigh, and do you think that is going to be an issue?
I just made a bunch of changes to my board, and I’m not sure which of them did what entirely, but I managed to lighten my wheel/tire combo by about 300 grams per wheel, and I think that is where most of the upsides are coming from. I’d be concerned about the effects of having what seems like a really heavy wheel and tire setup. I’m a noob when it comes to this stuff, though.
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I bet it really changes things…
Maybe he feels glued to the ground…
Yes, that was the exact plan. Just have to cut out a rectangular section of ABS in the right size and drill a couple holes. Mounting it is gonna be the hard part though. I am considering just double sided tape and maybe some strategically placed safety zipties
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Could you tap the frame for some small m3 or m4 bolts? I would do double sided tape mostly and a few screws. Butyl tape could be good too…
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From my experience, their inertia actually means more stability! And the size means less jarring to hit bumps. Finding the perfect bushing setup and having good trucks matters much more though.
These wheels weight about 3kg each.
Each truck with it’s respective components attached weights around 10kg (including wheels motors etc)
Total weight of the board right now is 34 kg / 75 lbs
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Would be ideal but I don’t have cobalt bits so drilling would be a huge pain. Same for taps, I only have shitty ones, probably wouldn’t work for steel. So I’d need to buy new drill bits and taps which are good quality and the right material.
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Hm, like I said, I changed a bunch of things, but I went from 30 degrees front and rear to 35 front, 20 rear, and ended up with my deck about 2 cm higher and my wheelbase about 5 centimeters shorter. All of that has made it turn a lot easier, but it’s also much more stable at speed, which I don’t get. I thought it was due to the drop in the wheel weight, but maybe having the split angle is just that much better. The tires are actually the same. 8x3.00-4, but before I had them on Rockstar II Pro XLs and with tubes. Now I’m running them on Fivestars in a jerry-rigged tubeless setup. It felt to me like the wheels being lighter made little bumps and things cause way less instability. Maybe I’ll do more testing to try to figure out exactly what did it. I didn’t realize how much I was raising my deck with my changes until it was together, and I thought it was going to be awful, but it ended up feeling massively better.