The only dimension relevant to me is the Bolt circle diameter
That’s what D is.
d is the bolt hole diameter
Not looking for bolt hole diameter. Look at my drawing above. All the bolt holes are placed on a 80.3mm diameter circle. That circle dimension is what I seek. I think I understand what you are saying, I missed the small d verses the large d
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Finally a good fuckin street thane wheel with a metal core, cant wait til its released i may give it a try.
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In this image, that formula would be
(51.3mm - 4.1mm) / sin(36°)
(47.2mm) / sin(36°)
which is 80.3mm just like your drawing says
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Thank you, I am good with Solid Works but bad with formulas…
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Knock off already? Yikes, now 8 mount bolts? 6 is overkill as it is
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Okay. Holy shit I was fried earlier.
That picture I posted is completely fucking wrong and stupid dunno wtf it’s even about tbh. I was trying to confirmation bias Brad’s 75.75mm answer when looking for it and didn’t even process what the picture said, I was still doing math in my head and for some reason thought that picture said what I was doing. It, very obviously, does not.
Confirmation bias a hell of a drug kids.
When I said I was going into solidworks, I completely forgot about that STL that had been posted. It is… very wrong. Unless I have some older or newer evolve hubs than what it was based off of.
Brian, whatever you did math to (was it the stl?) is wrong
http://prntscr.com/1wwgbsn - STL is wrong - hole is 4.5mm irl
http://prntscr.com/1wwgzis - Whatever Brian worked off of, 80.3 definitely wrong (also, STL is wrong so it’s compounded)
http://prntscr.com/1wwkth5 - reconstructed from IRL measurements against the screw holes & a pin
& finally, measurements against an 8mm shaft & pin (4.5mm pin shaft, 7mm pin cap)
Outer shaft edge to outer pin cap edge: 46mm
46mm - 4mm - 3.5mm = 77m dia aka 38.5mm radius : This is the bolt circle diameter, aka the circle that the holes center points lie upon.
Sorry about all that, my brain has been really mush as of late. If @xsynatic wants to clean up thread of my dumb posts, feel free.
Looking forward to what Brad gets. The topography of that hub makes it a bit of a bitch to measure.
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Just stick bolts in two of the closest holes and measure them with calipers.
TFW u have an iPhone 13 pro max but still post pictures from your shit phone
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yes, for the stick bolts in holes, that is what I did for the third prntscrn screenshot. That SOLIDWORKS is made up from the bolt measurements of adjacent and non-adjacent, + knowing that it’s 72* spacing. Set all of the defined holes around a non-defined bolt circle until it matched up w/bolts in holes measurement.
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measuring the hub on a truck shaft against a single bolt is much easier, quicker, and more accurate IMO. That is the last information in that post.
The reason I’m doing this/completely wasting time
I was able to eye a fully assembled & pressurized wheel with calipers in 15 seconds last night to between 38mm-39mm radius. It had been a while since I’d done anything like that tho so I thought I was off by a bit.
So I wasted time checking it against two real methods today… and yeah, eyeing it was just fukn fine.
Pics from last night I was gonna post but didn’t want to clutter thread. Woke up and decided to clutter thread I guess, so I’ll post them
Doing this has made me salty at evolve tbh. Reeee
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OK, so I received the Evolve AT wheels and this is what I came up with. The 5 bolts are on a 76.76 mm circle
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Sounds likely to be 76.2mm (3.00 inches) maybe?
Hard to second guess parts designed in Australia and made in China. Seem to be good strong wheels though.
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I was going to make a small writeup but got really pissed about the whole thing…
It’s 100% 3", slight bit of leeway with tolerances. I think 3" + rather than 3" -
I was so confused as to why they felt the need to use such weirdass metric dimensions, but not once did I change my calipers to imperial because I knew the hub went together with M4 (not 5/16th) bolts, and surely they wouldn’t mix/match dimensions like that… but then I realized they’re hubs for 6"/7"/8" tires… and yeah, they mixed and matched and it’s 3" bolt circle.
Your picture of the trig equation is also spot on. FWIW, that’s what I was after when searching for a quick picture solution, but Google is shit anymore for search terms.
As @Venom121212 stated above, the pic I found is entirely based on estimations around the strange fuckery of measurements that deal with US car rims.
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I made that because I could not find any relevant formula. And I was even using duckgo 
Feel free to remake it with the “D” term explained in the image LOL
More refined measurements here so 3" bolt circle will work with the hole clearances.
Nice detail on the Evolve hubs are the valve stem counterweights:
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76.76 mm is also a common stock piston diameter…off topic, sorry
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I am guessing you want to make the evolve pulleys fit your wheel hub thing so they can be put on those boards?
For a bit I thought you might be somehow using that same outer mold but the resulting wheel fitting on the evolve hubs but I don’t think that is your plan.
The Evolve pulleys are press-fit so that would be more a matter of making sure the shape of the hub is right - rather than the bolt pattern.
If it’s to try and make these new-fangled urethane tyres fit the Evolve hubs in the same fashion as above, that would mean widening the hub. I’m curious how that would affect the torsional rigidity of the hub.
…but I think I see where this is going and it’s very exciting!
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