Sur-Ron - Belt upgrade KIT

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madin88   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by madin88 » Mar 06 2020 1:25pm

sens_dep wrote:
Mar 06 2020 1:00pm
I heard the gear ratio of this kit is 1/8.5, sound correct?
It is 1 : 8.25

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Allex   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by Allex » Mar 07 2020 7:43pm

sens_dep wrote:
Mar 06 2020 1:00pm
Hey Allex! Just purchased one! Super excited.

Just a few questions:

I’ll be testing this up against Luna’s belt drive... I should expect more torque out of yours, right?

I heard the gear ratio of this kit is 1/8.5, sound correct?

Where can I buy extra belts? What’s the length on them? And where do I get that awesome looking red belt!? :twisted:
Yes, you will have more torque as it is a 52t eqv where 48t is the stock sprocket on a surron.
I will send you a red belt, those are the ones we have in stock for now. I have extra belts as well, they are 1440mm

PellyNV   1 µW

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Re: Sur-Ron - Belt upgrade KIT

Post by PellyNV » Mar 27 2020 9:46am

I've been battling a dreaded squeal sound at higher speeds (and once it shows up, it will start happening at lower speeds) since I purchased this kit. In between juggling work and family meltdowns with this pandemic, I've been trying to get to the source of the issue. Confirming belt tension (on both belts), confirming alignment, trying cold-weather surf wax, spokes tight, etc.

Last night, I finally disassembled everything and went through assembly from scratch to ensure I wasn't missing anything.

I'm still hearing the same high-pitch squeal once I hit higher speeds....and once it shows up, it even stays at lower speeds.

Any suggestions on what else I can do to get rid of this? :?:

PellyNV   1 µW

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Re: Sur-Ron - Belt upgrade KIT

Post by PellyNV » Mar 27 2020 10:08am

The same sound is heard in this video:

https://www.youtube.com/watch?v=jdGNE343-mU

Bullfrog   1 kW

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Re: Sur-Ron - Belt upgrade KIT

Post by Bullfrog » Mar 27 2020 10:53am

No clue what the squeal is but I don't think it is drivetrain related because the tone doesn't change with the speed.

Wild guess...I'd say it is something electrical/electronic that is resonating.

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madin88   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by madin88 » Mar 27 2020 2:31pm

PellyNV wrote:
Mar 27 2020 10:08am
The same sound is heard in this video:

https://www.youtube.com/watch?v=jdGNE343-mU
The noise you talk about is it the high pitch wine which is getting louder when you film on the controller?

This sounds like typical noise from the controller and/or motor which comes from PWM frequency being in audible range.

Do you mean this?

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fechter   100 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by fechter » Mar 28 2020 12:43pm

I found the spokes were resonating on mine. I placed zip ties on the spoke crossings and it was greatly reduced.
"One test is worth a thousand opinions"

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Re: Sur-Ron - Belt upgrade KIT

Post by PellyNV » Mar 31 2020 6:45pm

Here's a quick video I took today showcasing the exact sound....

https://youtu.be/FpXsnf7TVTI

Any other feedback greatly appreciated!

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sens_dep   1 mW

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Re: Sur-Ron - Belt upgrade KIT

Post by sens_dep » Apr 17 2020 1:13am

PellyNV wrote:
Mar 31 2020 6:45pm
Here's a quick video I took today showcasing the exact sound....

https://youtu.be/FpXsnf7TVTI

Any other feedback greatly appreciated!
I had a similar issue with the Luna belt drive kit as well, and it never went away. It was a bit more frequent than yours, as you can hear the rotation of the motor. Mine was a constant whine, at any speed. Some people suggested primary drive belt tension (you can look up a tutorial on how to do that, its super easy), but that only made the whine stop for a few minutes. High top speed would make it come back. And it wasn't spoke resonance, like the above comment suggested. As i had the vibration-like noise before and after i completely swapped the wheels.

After installing this kit, i get the noise right when i start up the bike, HOWEVER after the first few hundred feet it goes away and doesn't come back until the bike has sat overnight. Very strange. My bet is on something within the primary drive belt and the shaft, NOT this kit. Saw someone selling a chain drive for the primary belt... I wonder how loud it would be to remove the primary belt and swap it... My personal preference is a dead silent bike.

FYI this kit has been FANTASTIC. It skips WAY less than the tiny Luna kit (actually never) with my Nucular 24f controller. If i could rate it? 5/5 :flame:

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Allex   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by Allex » Apr 17 2020 5:08am

Hi,
The whole purpose of this kit was that we wanted to avoid the belt skipping, especially at high power, this is very important, otherwise you will just damage the belt.
If you install chain drive on the primary, the bike would be very loud.

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madin88   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by madin88 » Apr 19 2020 12:07pm

sens_dep wrote:
Apr 17 2020 1:13am
After installing this kit, i get the noise right when i start up the bike, HOWEVER after the first few hundred feet it goes away and doesn't come back until the bike has sat overnight. Very strange. My bet is on something within the primary drive belt and the shaft, NOT this kit.
Yes i did listen the vid a few times and given the slow speed he was riding, the noise would more suit to the primary drive with it's higher RPM and belt speed.

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Allex   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by Allex » Apr 20 2020 4:31pm

I usually release the primary belt tension by one click from the factory setup. The is less drag in the bike, there is less noise and it does not skip at 12kW of power.

Terrified   1 µW

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Re: Sur-Ron - Belt upgrade KIT

Post by Terrified » May 13 2020 6:01am

Why on earth doesn't the rear sprocket have an inner retaining ring?

Please don't say 'because it doesn't need one', that would be lame. As I see it if I hit anythingfrom the side the belt will just come off and I'd be stuck. Is that the idea, for it to come off for sfety reasons?

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fechter   100 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by fechter » May 13 2020 8:58am

I'd recommend installing the rear sprocket so the flange is on the inside. This way if the belt decides to come off, at least it won't get caught on the spokes. It also makes it easier to inspect the teeth and makes it easier to take off the rear wheel.
"One test is worth a thousand opinions"

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Allex   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by Allex » May 13 2020 12:45pm

If the belt comes off to the outside where the riders right leg is, well that can get dangerous.

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madin88   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by madin88 » May 14 2020 5:30am

Terrified wrote:
May 13 2020 6:01am
Why on earth doesn't the rear sprocket have an inner retaining ring?

Please don't say 'because it doesn't need one', that would be lame. As I see it if I hit anythingfrom the side the belt will just come off and I'd be stuck. Is that the idea, for it to come off for sfety reasons?

This is standard on most belt drives. Two guide flanges on the small pulley and only one flange on the large. It is what manufacturers recommend.

If you hit anything from the side i think it will be possible to put it back on with your hands.
Normally if it comes off then you have a big alignment problem and you better have the tools with you to fix that (for axle nut and tension screws).

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fechter   100 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by fechter » May 14 2020 9:44am

Allex wrote:
May 13 2020 12:45pm
If the belt comes off to the outside where the riders right leg is, well that can get dangerous.

If the belt comes off either side it can get dangerous. Once the belt comes off, it will immediately stop moving.
That said, as long as the sprockets are properly aligned and the axle doesn't come loose or something there isn't much chance the belt will ever derail. I've had several belt driven scooters and never had a belt come off, but have had belts break.
"One test is worth a thousand opinions"

srapy   100 mW

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Re: Sur-Ron - Belt upgrade KIT

Post by srapy » May 22 2020 10:39am

After 500km my belt drive looks like the following pictures.
The teeth look good, but at some places the belt starts to come apart.
It does not slip until now, but I had squeaking sounds until I started spraying "Mannol 9897 Belt Tensioner" all over the belt.
Now I just have to spray every second/third ride depending on dirt to not make it squeak.

And attached a video of the belt drive on a 15KW Surron

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Merlin   10 MW

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Re: Sur-Ron - Belt upgrade KIT

Post by Merlin » May 23 2020 6:34am

Is your belt equal to 42T?

Power from zero looks more like 6-8kw only.
Stock tires and pretty low wheelspin on dirt.


Controller? Can't see what it is.

srapy   100 mW

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Re: Sur-Ron - Belt upgrade KIT

Post by srapy » May 23 2020 12:58pm

Merlin wrote:
May 23 2020 6:34am
Is your belt equal to 42T?

Power from zero looks more like 6-8kw only.
Stock tires and pretty low wheelspin on dirt.


Controller? Can't see what it is.
Its the one from Allex, see Post 1.
Who says that I am always full throttle in the video?
15,4KW is Peak, logged in Vesc-Tool.
Vesc 75 300, as written in video discribtion.

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Merlin   10 MW

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Re: Sur-Ron - Belt upgrade KIT

Post by Merlin » May 23 2020 2:48pm

Nobody says... You can see it that you pinned the throttle. :D
300 means? Phase? Would fit how it looks.

No offense buddy... Not bad for the tiny vesc.

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Allex   1 GW

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Re: Sur-Ron - Belt upgrade KIT

Post by Allex » May 25 2020 12:33pm

Good pictures, looks like that spray attract a lot of dirt and the belt is stuffed with it? This leads to excessive sprocket wear.

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Re: Sur-Ron - Belt upgrade KIT

Post by Hummina Shadeeba » Jul 05 2020 2:15pm

I’m trying to convert a regular bike to electric and wondering if it’s possible to mount these sprockets and belt on a regular bike.
I’d mount the motor cog hopefully on a “freewheel” on an 8 or 10mm motor shaft and hopefully can get the wheel cog on the brake rotor mount (I want to still pedal and would leave a chain on the other side of the hub and single speed on the wheel Freehub body). Anyone do similar?

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