Boardnamics M1 Gear Drive + Other News

[b264]

Love the prime numbers

[pmg]

#metoo

[Boardnamics]

Good for the tooth wear.

[realistic69]

alright I better find myself a torch to use. I emailed about adding the new axles to my order in progress.

Anyone got a good source for 10mm bearings?

[moddedlife]

@Boardnamics

must buy their own spacers for it

How? Why can’t I just put it on the same fivestar hub as my 8inch? Why must something need to change?

[ShutterShock]

I would assume it is because of the extra step on the AT type trucks. It changes the spacing

[moddedlife]

@ShutterShock

AT type trucks

Is this just for the boardnamics trucks? I want to use 9s on matrix ii

[Boardnamics]

That’s fine then, I will ship with what spacers are required.

[moddedlife]

@Boardnamics

The M1-AT fits 220s but it requires a different spacer combination. One must buy their own spacers for it. If there is enough demand, I’ll buy the spacers.

Wait am I confused here? Are you talking about fitting 220mm tires or using the BN 220mm axle? I won’t have a problem using M1 AT with matrix ii trucks and 225mm (9inch) mbs t2 tires with fivestar hubs and also mbs t3 200mm (8inch) tires?

[sleepless]

@jack.luis

Do you plan on adding BN220 support to the M1AT?

@Boardnamics

The M1-AT fits 220s but it requires a different spacer combination

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[moddedlife]

I didn’t see the first message I was confused about why 9inch tires would be a problem. Thanks

[sleepless]

I’m curious, what gear ratio are people choosing for their M1-ATs?

I’ve no mtb experience. Is it like 5.20 == torquey, 4.60 == balanced, 3.95== speed? (ignoring all the other variables of course)

[Nacho]

How much do you weigh and what size tires?
I’m going 3.95 on superstars metr155 I’m 235lb on a good day i’m a little hesitant I might upgrade to 4.6 but definitely not 5.2 I want a little torque but not mountain climbing torque

[pmg]

I like to put in the calculator all the variables including a standard kv like 190 and from then find the gear ratio that meets the top speed you wanna reach.

[ShutterShock]

I think that is the general idea?

I can tell you this, like I just said to @Paul77

@ShutterShock

I went with the highest (5.2) ratio with my 190kv 6384’s.

My thoughts thus far are that I still have my motors set at only 77a instead of like 120, and I haven’t gone past like half throttle yet.

Everything on this board is too new to me to ride it hard yet. When I release my review video on the drives, I’ll have put at least 100 miles on it, but I can’t offer too many solid opinions yet.

I’ve only ridden it a little bit but it’s been awesome so far, with tons of torque.

If you are getting a lower KV, feel free to go with a lower ratio, but if you go with 190, I think you will be happy with the amount of torque on 5.2 for a mountainboard. Again, preliminary thoughts.

I ride my bergs street board pretty hard and this has WAY more torque than that. My street hummie is 15:40 ratio on 145mm wheels with 190kv motors.

[sleepless]

@pmg

ratio that meets the top speed you wanna reach.

Sure, but that doesn’t give any indication of how quickly you’ll reach that top speed.
The 3dservisas calc gives a torque value, but I have no context for what’s strong/weak.

@Nacho

weigh and what size tires

Let’s say 200lbs / 90kg and 200mm / 8in tires. I’m still unclear on how to balance motor kv vs gear ratio vs battery voltage. It’s a multi-variable equation!

Edit: generic setups

---

#1 [Balanced A]
Battery - 12S (43.2V nom)
Motor - 170 kV
Tires - 200mm
Gears - 4.6
→
Avg Loaded Speed: 33.6 mph / 54 kmh
Max Torque: 22.7 ftlbs / 30.8 Nm
*this works out the same if you choose 190 kV and 5.2 gear ratio. interesting.

---

#2 [Balanced B]
Battery - 12S (43.2V nom)
Motor - 170 kV
Tires - 200mm
Gears - 5.2
→
Avg Loaded Speed: 29.8 mph / 48 kmh
Max Torque: 25.6 ftlbs / 34.7 Nm

---

#3 - [Max Torque]
Battery - 12S (43.2V nom)
Motor - 140 kV
Tires - 200mm
Gears - 5.2
→
Avg Loaded Speed: 24.6 mph / 40 kmh
Max Torque: 31.1 ftlbs / 42.1 Nm

---

#4 - [Max Speed]
Battery - 12S (43.2V nom)
Motor - 170 kV
Tires - 200mm
Gears - 3.96
→
Avg Loaded Speed: 39.2 mph / 63 kmh
Max Torque: 19.5 ftlbs / 26.4 Nm

Per https://calc.3dservisas.eu with default efficiencies, power consumption, etc

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Still curious if anyone can put a quantitative value to SUPER TORQUEY

@ShutterShock , what size tires are you running on your setup?

[moddedlife]

I went with 140kv and 5.2:1 because I’m building a 16s so that’s gonna push the max speed way higher than what I need and this configuration will lower the speed the most and give me the most torque (something like 60kph/38mph for 9inch tires)

[ShutterShock]

Yeah if you go higher voltage that makes all the diff. I’m only on 12s so I’m more limited in that regard. I think mine will max out at 33 loaded right now, but since I picked the highest, I suppose I can always upgrade to 16s later if I wanted

[ShutterShock]

I’m running 8 inch MBS T1’s

@sleepless

quantitative value to SUPER TORQUEY

No idea haha, we would need qualitative data like how fast acceleration to 20mph is or something

[pmg]

@sleepless

Sure, but that doesn’t give any indication of how quickly you’ll reach that top speed.

True, I guess experience is a big helper with this. I tried 3:1 with 6" tires which for me didn’t have enough torque even with 130kv. Also tried 4.8 with 7" tires and I was pretty happy with plenty of torque.

Personally I would consider this a reasonable setup with 12S:
At least
4 with 6"
4.5 with 7"
5 with 8"

Assuming 190kv and 12S one will probably have enough torque if the top speed stays under 50-60 km/h. This is not based on exact math, just from trying with a sample of 4 different setups.