Rear sprocket and hub issue

[Yodaman1]

Hello family.

I'm having a problem with my ebike. Forgive my ignorance as I'm learning as I go. This weekend as I'm riding up the driveway, I heard a loud noise and now the rear sprocket spins without moving the tire. Any idea what is wrong? Attached is the rear sprocket and hub. Any advice would be greatly appreciated

 

[stompandgo]

Sounds like you blew out the freehub.

 

[Yodaman1]

Sounds like you blew out the freehub.

Is there a better freehub available that will work?

 

[Jeremy McCreary]

Is there a better freehub available that will work?

To help with that, we'd need to know what bike you have.

 

[indianajo]

I've found 6 & 7 speed freewheels & freehubs are cheap chinese garbage. Even Shimano. Designed to last 1000 miles until the bike rusts away in the rain. I broke a 6 speed axle with my enormous 180 lb body. No, I don't jump rocks & picnic tables. The 7 speed has no locknut on the internal race, so the race backs off and drops the balls all over the road. Mind did. I don't have a support motor vehicle or person, so I pushed mine home.
8 speed shimano hub, I put 12000 miles on mine, no problems. Made in singapore I believe.
If you don't want to learn how to lace wheels, buy an entire rear wheel from a junk bike. Or buy the whole bike and make one out of two. Or ride around in a SUV or pickup late at night before garbage day, and pick up one for free.

 

[Chargeride]

Buy a quality replacement, not some cheap generic version and you will be fine.
Also check the hub axle bearing, if its even slightly worn in can mis align the freehub pawls and cause early failure.

 

[Base]

Today I am shooting tech videos at our show Bike Shop showroom... We have a few opend up components.


In the pictures below you see the internals of a DT hub, I am poiting out the freehub.

This free hub has a bit different layout, works the same.

Take your wheel out and unscrw the cassette and see if this is a "pop off" version of one which needs to screwed of. Usually there is also a laser printed partnumber on it so you could find a spare

 

[Base]

Shimano hg splined pull of freehub example

 

[harryS]

This might help, if it is a Quanta hub with cassette. Never opened a cassette myself.

 

[Yodaman1]

It's a Letli direct from manufacture.

48V30Ah Big Battery Long Range Electric Fat Bike Bafang G510 Mid Drive Ebike-Changzhou Leili Vehichle Parts Co., Ltd.

BIGGER BATTERY = GREATER DISTANCEThink of the battery as the gas tank for your eBike. The more gas y-Changzhou Leili Vehichle Parts Co., Ltd.

www.leiliebike.com

To help with that, we'd need to know what bike you have

 

[Base]

aha if ypur bike indeed has a pull of freehub design (as shown in the video above) you could remove the wheel from the bike, remove the cassette from the freehub body, remove the left/NDS hubcap, pull out the axle with the freehub. Than you can check if palls are are still there and if the cleaning and lubing them could help to get them back in position. Also check the internals of the hub interface, there should be teeth that are not worn (so clean them to check) . start reading here for a simple explanation https://www.parktool.com/en-int/blog/repair-help/freehub-service

 

[Yodaman1]

aha if ypur bike indeed has a pull of freehub design (as shown in the video above) you could remove the wheel from the bike, remove the cassette from the freehub body, remove the left/NDS hubcap, pull out the axle with the freehub. Than you can check if palls are are still there and if the cleaning and lubing them could help to get them back in position. Also check the internals of the hub interface, there should be teeth that are not worn (so clean them to check) . start reading here for a simple explanation https://www.parktool.com/en-int/blog/repair-help/freehub-service

Ok thanks! Strange though, as I've only ridden it 3 times on the road and up our driveway.

 

[Jeremy McCreary]

If you have a local bike shop willing to work on your ebike, I think that should be your next move. It's just a mechanical problem that any bike mechanic should be able to fix — provided they can get parts.

 

[gromike]

What gear were you in when riding up your driveway? Hopefully you downshift. The installed freehub might not be capable of handling the 170Nm of torque your mid-drive can produce.

 

[PedalUma]

The problem is that it has bike parts with a 140Nm motor that also has a throttle, when people don't shift because they do not know how to bicycle with high cadence and downshift. So, yes it is built to fail. And it can never go on a bike path, in a bike lane, or on a public street because it is an unlawful motorcycle that is subject to being impounded. A buddy thought that more was more, then tossed two grand into new wheels twice with this motor. It blows hubs. He would take off in high gear by hitting the throttle.

 

[Yodaman1]

What gear were you in when riding up your driveway? Hopefully you downshift. The installed freehub might not be capable of handling the 170Nm of torque your mid-drive can produce.

I was in second gear. See pic for that's how she sits.

 

[fooferdoggie]

Today I am shooting tech videos at our show Bike Shop showroom... We have a few opend up components.


In the pictures below you see the internals of a DT hub, I am poiting out the freehub.View attachment 199988View attachment 199989

This free hub has a bit different layout, works the same.

Take your wheel out and unscrw the cassette and see if this is a "pop off" version of one which needs to screwed of. Usually there is also a laser printed partnumber on it so you could find a spare

few have the cassette pop off. it freaked me out the first tiem it happned on my dt swiss hub. I found if I have to haul a back wheel around it needs a zip tie thtough the axle and zipped in a loop to keep it all together.

 

[Yodaman1]

Wow, never thought it was such a powerhouse!

The problem is that it has bike parts with a 140Nm motor that also has a throttle, when people don't shift because they do not know how to bicycle with high cadence and downshift. So, yes it is built to fail. And it can never go on a bike path, in a bike lane, or on a public street because it is an unlawful motorcycle that is subject to being impounded. A buddy thought that more was more, then tossed two grand into new wheels twice with this motor. It blows hubs. He would take off in high gear by hitting the throttlle.

 

[Gionnirocket]

Wow, never thought it was such a powerhouse!

I have the same motor and am not having issues. You need to apply power evenly and shift as needed not just slamming it in and you won't have any issues.
If I drove my sports car like I was on a race track or an 18yr old, I would be blowing rear ends and transmissions too.
So ride it as designed.. a power assisted pedal bicycle, not a motor powered vehicle.

 

[PedalUma]

I remember when people would drop a small block Chevy into a Volvo. Cool, right? But if you revved and popped the clutch like an 18-year-old the rear end landed on the tarmac.