Sunder
10 MW
Hey all,
I am trying to decide how to distribute the weight of the battery on a bike. In the past, 2-5kg on an eBike wasn't an issue, but now I'm talking about 50kg, and I think it will make a difference.
The rules of thumb I've heard are:
1. Lower on the bike is more stable.
2. More weight over the back wheel = more traction - to a point, after 60/40 or 55/45 or even 50/50, some magical number, there seems to be an agreement that more weight on the back isn't advantageous to handling.
So I've thought of four ways to mount it and its pros and cons, and I was wondering if anyone has any experience racing or designing motorcycles could give any advice?
Option 1: Diagonally
Pros - Easy. There are already mounts for engine and gearbox exactly where I need them, and I can do all metal fabrication myself.
Front/back balanced - battery is mostly weighted towards the back.
Cons: A fair bit of the weight is high.
View attachment 2
Option 2: Diagonally at the back
Pros - Almost all weight over the back wheel
Cons - Gonna be an awfully tight fit, if it fits at all. Don't know if I need custom metalwork.
Weight very high
Too much weight over the back wheel, given the wheel itself is already getting a few kilos of magnets, copper and stataor?
View attachment 3
Option 3: Low and centered:
Pros - Weight low and centered.
Cons - Need to modify the fairing (The box will come fairly close to touching the front wheel. Will look ugly.)
Will definitely need custom metal work to make a frame.
View attachment 1
Option 4: L-Shaped box
Pros - Weight low and centered.
Cons - Electrically annoying to build an L-Shaped battery.
Will probably need custom metalwork.
Thoughts would be appreciated.
I am trying to decide how to distribute the weight of the battery on a bike. In the past, 2-5kg on an eBike wasn't an issue, but now I'm talking about 50kg, and I think it will make a difference.
The rules of thumb I've heard are:
1. Lower on the bike is more stable.
2. More weight over the back wheel = more traction - to a point, after 60/40 or 55/45 or even 50/50, some magical number, there seems to be an agreement that more weight on the back isn't advantageous to handling.
So I've thought of four ways to mount it and its pros and cons, and I was wondering if anyone has any experience racing or designing motorcycles could give any advice?
Option 1: Diagonally
Pros - Easy. There are already mounts for engine and gearbox exactly where I need them, and I can do all metal fabrication myself.
Front/back balanced - battery is mostly weighted towards the back.
Cons: A fair bit of the weight is high.
View attachment 2
Option 2: Diagonally at the back
Pros - Almost all weight over the back wheel
Cons - Gonna be an awfully tight fit, if it fits at all. Don't know if I need custom metalwork.
Weight very high
Too much weight over the back wheel, given the wheel itself is already getting a few kilos of magnets, copper and stataor?
View attachment 3
Option 3: Low and centered:
Pros - Weight low and centered.
Cons - Need to modify the fairing (The box will come fairly close to touching the front wheel. Will look ugly.)
Will definitely need custom metal work to make a frame.
View attachment 1
Option 4: L-Shaped box
Pros - Weight low and centered.
Cons - Electrically annoying to build an L-Shaped battery.
Will probably need custom metalwork.
Thoughts would be appreciated.