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https://www.youtube.com/watch?v=1BoWQ54NpU0&t=715s
MXR pack has 4*21*6 = 504 cells at 10.8Wh per cell (VTC6) = 5.4kwh
The pack also has cells that don't have contact with the thermal casing which means there is a long path to conduct the heat out.
Stark pack is here at 10:02 - https://www.youtube.com/watch?v=ozEEvlgtTPE&t=986s
Each cell bottom goes into the metal case. Heat path is a lot shorter than with the MXR.
Takeaway: the Alta battery was far less capacity KW and voltage than advertised when actually measured.
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This would do two nifty things, in my opinion. Number one, it would make it so the bike an average person rides (the lightweight bike) would be light as a feather and thus not quite as perilous to crash as even a 250F, and two, it would almost certainly bring back a sort of "works era" to our world, as all the OEMs would no longer be limited in terms of the DISPLACEMENT or POWER of their bikes, only the WEIGHT. They could be as radical as they wish to be in terms of design. If you remember the 80s-era Honda twin-cylinder RC125 with Ribi forks (my all-time favorite bike by a mile), then you see where I'm going with this thought. Further, if you remember the 70s era, when there were so many different brands (Maico, AJS, CZ, Rickman, Bultaco, CCM, etcetera, etcetera), then you see where I'm going in that direction too. Electrification might bring dozens of new bike brands to our world, because there's not all that much more front-end development costs than there are on today's electric mountain bikes. This new bike proves that point, does it not? I mean, who'd ever heard of them before now?
Anyway, this was kinda my point when I said it would be nice if the pessimists could maybe start their own thread and just go bitch and whine there. I think there's much to discuss, many new ideas to ponder that are exciting and uplifting, and spending time and energy trying to defend against things like SilverSpurs' kooky rant that this new bike doesn't actually "exist" and that Tortelli and Hill are only saying good things about the fake, photoshopped, bikes they're riding because they've traded their integrity for a few bucks, is like your car getting stuck in the mud. It just goes nowhere, and it ends up a big mess.
As a motocross racer, I prefer quantifiable movement. I'll be the first to concede that whatever happens to this sport, it will happen with me being irrelevant due to my age. That doesn't mean I don't care, though. I do, and if you ask me, the future is gonna be AMAZING........ provided the AMA and FIM don't screw it up with short-sighted bureaucratic thinking, that is.
If these battery bikes are gonna run a professional 30 plus 2 mudder with a restart at marketed power the lightweight ones will need to weigh at least 300 lbs.
Usually the heavier the vehicle, the more severe the crash.
And that thing about the mudder with the restart. Good grief. I remember living in NYC back in 1990 right before the Iraq War. I was having dinner with two friends and they said the Iraqis were gonna kick our ass because we didn't have tanks that could go through sand. I said, "You really think we don't have any tanks that can go through sand?," and they replied, "As usual, your optimism is blinding you and making you SO NAIVE. We saw it on 60 Minutes last night, The Iraqis have an elite guard who are better than our soldiers and our tanks can't go through sand. We can't win."
Turns out they were right, and thats why we're all now ruled by Saddam Hussein. Wait, that didn't happen? Amazing. And now, the only electric motocross bike that will ever be able to endure a mudder will weigh 300 pounds and I'm a naive optimist to think otherwise, Stamp it.
Tiresome, just so goddam tiresome.
There are a few design differences with the Stark pack as far as I can see from the CAD images.
First, it appears they are using a larger cell than the 18650; probably 21700's. There appear to be 400 of them, and the math checks out. 400cells x 3.75v x 4.0aH = 6kWh. At a maximum charge probably 4.1v, 6.5kWh? Depends on the actual cells they use. These cells can go up to a maximum of 4.2v but you can't run the bike that way since you can't allow regen (engine braking) to pump more energy into the cells at that point. Would be kinda sketchy riding your first lap without engine braking.
The second major difference is that, unlike the Alta pack where the cells are standing up vertically in a module and 4 modules sandwiched together, the Stark pack has the cells laying horizontally and in 2 case halves, which means every cell is in direct contact with the exterior case with the same distance to airflow. Thermally this should allow for more efficient and even cooling of the cells, but there still will be a temperature gradient where the warmest areas will be in the internal center of the pack.
Stark pack for reference:
E-motocross bike is not for everyone it has its advantages and disadvantages. It’s all about having fun.
.Before I depart, though, I'll leave you with a few simple questions:
1. What if you never hit another false neutral because you COULDN'T?
2. What if your bike never seized it's crank because it COULDN'T?
3. What if your local track held Saturday Night races and no one complained about noise because they COULDN'T?
4. What if YOU and YOUR FRIENDS held races in a nearby field and no one complained because they COULDN'T?
5. Lastly, what might happen to your life if you stopped conflating being pragmatic with being sage and being curious with being negative?
My outlook on life was once so dark and dour it almost killed me. I barely - BARELY - made it out of my twenties. In a hospital bed long ago, I vowed to change my outlook once and for all, and against all odds, I did it. I embraced blind faith and bold optimism like they could cure my incurable disease, and they did exactly that, despite the utter impossibility of it. Forty years ago I was told I only had a few years to live. Optimism healed me. Learn from that, young moto-heads, and run headlong toward your future like it's full of guaranteed bliss, for like life itself, it will likely mirror your approach.
Off I go. Be well, and take care who you let bend your ear. Bye now.
I may buy one in a few years, right now I am damn happy with my YZ250F.. maybe my 4 years old is going to start with an electric bike and he will be happy I'm sure and it´s going to be all he knows.
I consider myself lucky to have ridden 2 strokes and 4 strokes and maybe electric in years, what is not to like???
2. What if your bike never seized it's crank because it COULDN'T?
So E Bikes don't break?
Do they need a rider?
How many newbies are going to enter the sport because of electricity? "Oh, now that off-road motorcycles aren't polluting the Earth, I think I'll get one. I may as well get the 80HP version, because my car has 120 HP. I can handle it. Just twist the throttle WFO - the bike does all the work." Whiskey throttle follows...
Pit Row
My fiance who had never ridden a dirtbike before (had street experience) was able to hop on my Alta MXR that has "up to 50hp", and within minutes felt confident to go roll around a kids track. Why? Because in map 1 it doesnt have nearly the amount of max power and acceleration as the fastest power map does.
Thats one of the advantages of electric. 1 bike can be tame enough for the 0hr beginner all the way up to the person who has been riding their whole life, and everyone inbetween, all due to how flexibile the power mapping is. Not only that, but no shifting, no clutch work, and smooth predictable power makes riding much less scary for beginners. And thats a good thing. We want more people joining the sport.
Go back and watch some of the footage from the early Alta demo days and youll hear average Joe Motocross say things like "map 2 was plenty fast, map 4 is to just impress your buddies!"
https://www.vitalmx.com/forums/Moto-Related,20/STARK-FUTURE-VARG-An-Ele…
Im waitin for my tesla truck an now seeing ill be lukcy to get it In 2023
If musk can't make a truck happen since 2019 $100 downe, no chips battery design fails ECT how'll newbs make a bike in 6 monhts?
Wotn happen
The team behind Stark atleast has mx background... Also you don't need that much electronics on dirtbike. (if cruise control, abs, traction control, air conditioning and massage seat isn't included in options ofc) Phones are still being made so that's like 50% of the chips you need for varg right there. It is reasonable to expect delays but comparing it to stainless steel meme truck is ridiculous.
- snapped chain -> cause = you are moron or run the chains rockstar husky did in 2021 (sincere condolences)
- torn off sprocket -> cause = you are moron and don't torque your sprocket bolts properly
- electro motor bearings going bye bye-> cause = there are (most likely) three bearings in the motor but since you were sipping on Kool aid and blasting tunes into your helmet you didn't hear them howl loudly last 30 minutes before the fatal accident
I encourage others to add other mechanical failures (the complete destruction of rotor during use seemed unlikely to me so i didn't mentioned it; but i see it as likely as grenading the engine of your brand spanking new factory edition VetC class bike)
Post a reply to: STARK FUTURE VARG - An Electric Bike that is Faster and Lighter than a 450?