Search found 766 matches

by Grantmac
Mar 01 2021 3:07pm
Forum: EBike General Discussion
Topic: E-S LMX 64 Bike Owners
Replies: 1094
Views: 99601

Re: E-S LMX 64 Bike Owners

In that situation you would have anti squat for the pedals but not the motor. Probably better to run the jack shaft on the left side pedal shaft.
by Grantmac
Feb 28 2021 12:03am
Forum: EBike General Discussion
Topic: E-S LMX 64 Bike Owners
Replies: 1094
Views: 99601

Re: E-S LMX 64 Bike Owners

A concentric drive won't have any anti-squat behavior during acceleration which reduces traction, especially on rough ground.
by Grantmac
Feb 27 2021 8:12pm
Forum: EBike General Discussion
Topic: E-S LMX 64 Bike Owners
Replies: 1094
Views: 99601

Re: E-S LMX 64 Bike Owners

Lightweight motorcycle with pedals vs powerful ebike.
I actually wouldn't want a concentric drive, especially not shared with the pedals. You lose the ability to control squat.
by Grantmac
Feb 27 2021 8:10pm
Forum: EBike General Discussion
Topic: Build pack onto and around frame tube, rather than inside?
Replies: 24
Views: 339

Re: Build pack onto and around frame tube, rather than inside?

Measure the frame then 3D print cell holders which snap around it with the cells arranged radially.
by Grantmac
Feb 27 2021 8:08pm
Forum: EBike General Discussion
Topic: Please help me critique my dream ebike.
Replies: 22
Views: 428

Re: Please help me critique my dream ebike.

Put all the motor mass into either a big hub or big mid-drive. Running both gives the worst of both without any advantages.
by Grantmac
Feb 23 2021 8:01pm
Forum: E-Vehicles General Discussion
Topic: Motorsport, Racing, The Future
Replies: 18
Views: 379

Re: Motorsport, Racing, The Future

There is an EV offroad racing championship going live this year:
https://www.extreme-e.com/

They ran the last stage of Dakar as a demo.
by Grantmac
Feb 23 2021 1:52am
Forum: E-Vehicles General Discussion
Topic: Motorsport, Racing, The Future
Replies: 18
Views: 379

Re: Motorsport, Racing, The Future

To be clear I'm talking about grassroots motorsport: AutoX, karting, MX, cross country motorcycle and similar. The kind of thing people do as a hobby. I remember karting in mall parking lots and riding crosscountry motorcycles practically in town. People didn't used to consider silence a right. Thos...
by Grantmac
Feb 23 2021 12:14am
Forum: E-Vehicles General Discussion
Topic: Motorsport, Racing, The Future
Replies: 18
Views: 379

Re: Motorsport, Racing, The Future

Both are low on the totem poll, motor sport events are usually in out of the way venues, except for the monster truck series which is in the same stadiums sports are played because they are located in centrally located areas with access via mainline transit routes. Race tracks are almost always on ...
by Grantmac
Feb 22 2021 4:47pm
Forum: Electric Aircraft
Topic: Battery pack selection for self-launching glider
Replies: 7
Views: 179

Re: Battery pack selection for self-launching glider

A very marginal battery could end up not working at all after losing just 20% capacity. So cutting it really close could result in a very short usable life span. Then again from what I understand once you've taken off a sail plane can climb very efficiently. Throttling down once you've reached a saf...
by Grantmac
Feb 22 2021 1:04pm
Forum: Electric Aircraft
Topic: Battery pack selection for self-launching glider
Replies: 7
Views: 179

Re: Battery pack selection for self-launching glider

Finding a way to eject the pack in event of a fire is much easier with the smaller pack.

Keep in mind that using Lipo at high drain will reduce pack life way down. But then again how many flights per year are you going to get?
by Grantmac
Feb 22 2021 12:54pm
Forum: E-Vehicles General Discussion
Topic: Motorsport, Racing, The Future
Replies: 18
Views: 379

Re: Motorsport, Racing, The Future

I think EVs are the only thing which will save motorsport from both noise and pollution concerns.
by Grantmac
Feb 18 2021 9:34pm
Forum: EBike Technical
Topic: 85 Nm torque vs 160 Nm torque
Replies: 8
Views: 384

Re: 85 Nm torque vs 160 Nm torque

If you are doing any jumping you'll break the BBSHD bottom bracket.
by Grantmac
Feb 14 2021 6:23pm
Forum: EBike Non-hub Motor Drives
Topic: My Bafang Ultra Mountain Bike! Frey AM1000
Replies: 2372
Views: 321995

Re: My Bafang Ultra Mountain Bike! Frey AM1000

Hello everybody, after reading a lot about ebike conversions and failing to find a satisfying solution to convert my all mountain bike because of battery placement problems, I discovered the Frey brand thanks to this thread as a value for money option featuring the powerful Bafang M620 motor. So no...
by Grantmac
Feb 04 2021 10:02pm
Forum: EBike Non-hub Motor Drives
Topic: QS 3000 138 motor bike installation generalized
Replies: 15
Views: 1024

Re: QS 3000 138 motor bike installation generalized

Skip the bicycle freehub if you intend to push any real power. Just get the extremely robust and inexpensive Oset hub which has a 6 bolt pattern on each side, they sell a spider to mount kart sprockets directly from there.
by Grantmac
Feb 01 2021 12:13pm
Forum: EBike General Discussion
Topic: 3kw eBike Build Questions
Replies: 26
Views: 1116

Re: 3kw eBike Build Questions

BBSHD won't do what you want and a hub won't either. You need to consider the Lightning Rods LHD or a similar build.
by Grantmac
Feb 01 2021 12:10pm
Forum: EBike Non-hub Motor Drives
Topic: Rear Heavy Duty freewheel ?
Replies: 9
Views: 437

Re: Rear Heavy Duty freewheel ?

They also make direct fit sprockets and carriers to mount kart sprockets. Super useful parts and relatively cheap.
by Grantmac
Jan 31 2021 6:42pm
Forum: EBike General Discussion
Topic: Durable 10 speed cassette and chain?
Replies: 21
Views: 390

Re: Durable 10 speed cassette and chain?

I had a big reply typed and it didn't post. Basically the weak point in a chain is the rollers. They are the same width for all multi speed bike chains. Only the side plates are different and those don't typically wear. The ebike specific group sets use 11 or 10spd chains and spacing with fewer cogs...
by Grantmac
Jan 31 2021 3:58pm
Forum: EBike Non-hub Motor Drives
Topic: Rear Heavy Duty freewheel ?
Replies: 9
Views: 437

Re: Rear Heavy Duty freewheel ?

An OSET hub is probably easier and built for the task:
https://shop.osetbikes.com/hubs
by Grantmac
Jan 30 2021 9:11pm
Forum: EBike General Discussion
Topic: 3kw eBike Build Questions
Replies: 26
Views: 1116

Re: 3kw eBike Build Questions

The issue is the unsprung weight of the hub. Any offroading will be severely compromised.
by Grantmac
Jan 30 2021 7:45pm
Forum: EBike General Discussion
Topic: Durable 10 speed cassette and chain?
Replies: 21
Views: 390

Re: Durable 10 speed cassette and chain?

Modern ebike specific 10 speed stuff is stronger than cheap 7/8spd.
by Grantmac
Jan 30 2021 7:17pm
Forum: EBike General Discussion
Topic: 3kw eBike Build Questions
Replies: 26
Views: 1116

Re: 3kw eBike Build Questions

How much offroad use do you expect?
by Grantmac
Jan 29 2021 2:45pm
Forum: EBike Non-hub Motor Drives
Topic: Rear Heavy Duty freewheel ?
Replies: 9
Views: 437

Re: Rear Heavy Duty freewheel ?

I mean no freewheel at all. That part is to mount a freewheel onto a brake rotor mount, or so it looks.
by Grantmac
Jan 24 2021 11:42pm
Forum: EBike Non-hub Motor Drives
Topic: Rear Heavy Duty freewheel ?
Replies: 9
Views: 437

Re: Rear Heavy Duty freewheel ?

I would run a fixed rear gear with that much power. Any freewheel will be both a source of failure and also impair how precisely the power is applied. Modern controllers can provide a virtual freewheel for coasting if needed although personally I'd rather have a little engine braking.
by Grantmac
Jan 24 2021 11:33pm
Forum: EBike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 5396
Views: 605155

Re: Sur-Ron - New Mid drive Bike

Dishing wheels is very common on motorcycles, shouldn't be a problem.

Likewise running a smaller front tire is the norm on motorcycles. A regular 29er would probably work.
by Grantmac
Jan 23 2021 11:32am
Forum: EBike General Discussion
Topic: Giant Trance 3: How is this for a powerful conversion?
Replies: 15
Views: 516

Re: Giant Trance 3: How is this for a powerful conversion?

Way too expensive for a 26", worth maybe half that. Also no real point in using a full suspension bike if going with a hub motor. Why isn't full suspension compatible with a hub motor? The unsprung weight of the motor makes it unsuitable offroad. By the time you modify the suspension to handle...