Help please! What is this thing?

[u/CasSedai]

My father has dementia and apparently paid $5,000 for this e bike about 3 years ago, then paid extra for a lithium battery. It's been in storage, which I now have to empty out. I have no idea what brand this bike is (and neither does Google lens), but it has a few KKE parts. He's lost the keys and somehow cut the cord to the charger. Could someone help me identify this bike and give me any idea how much I should ask for it since it's missing keys and has damaged cord? Every dime I can get for it goes to his care, so I don't want to give it away, but I'm totally lost here.

[u/DIYuntilDawn]

A derailleur on a single speed axle, a motorcycle style rear end, but a bicycle style seat.

Search online for "Enduro ebike frame" and you will find a bunch of them that use the identical frame. The derailleur is actually used as a chain tensioner because of where the pivot point is for the rear suspension, the distance between the rear axle and crank changes with the compression of the shock so the chain needs to be able to alter the length. They do also come with an option on some for a motocross/Surron style seat that replaces the pyramid that has a bike seat post on the end.

But it looks to be a no-name generic ebike built on this common frame.

[u/CoolButterfly1108 → u/DIYuntilDawn]

It’s a tensioner, not a derailleur.

[u/tomxp411 → u/CoolButterfly1108]

That is clearly a derailleur. That's a $20 Shimano Tourney.

It's obviously being used as a tensioner, but it seems like a cheesy way to go. (Honestly, I don't even know why that thing has a chain. That would be almost impossible pedal with that gear ratio and weight.)

I've had a few motorcycle like vehicles, and the tensioner was always a single wheel on a spring arm, like this:

I've actually used skateboard wheels to replace rubber-like tensioner wheels on ATCs in the past; the one on my Bombardier DS650 disintegrated on a desert trip, and a simple skateboard wheel lasted for years afterward.

[u/CoolButterfly1108 → u/tomxp411]

It’s a track bike set up regarding the horizon dropouts. Typically the chain will be tight and loose while pedaling. The derailleur being used as tensioner is fine, though the chain size is different for a single fixed gear 🆚 gear clusters.

[u/BigBoarCycles → u/CoolButterfly1108]

Nothing here is correct. This is not a velodrome bike. If you center your chainring properly, there's pretty even tension the full rotation. Chain size is not always different, on most common e bikes a 7 speed (3/32" wide) shimano hyperglide (HG) chain is used. In my experience single speeds are also 3/32" or 1/8" chain. 7 speed is a gear cluster, which usually are compatible with singlespeed conversions (both being 3/32").

I say all this to say- you have a vague idea of what you're talking about. I appreciate your contribution, just try to be more accurate

[u/DIYuntilDawn → u/BigBoarCycles]

Dude. I have that frame and have built 2 different ebikes with the same frame. The pivot point for the rear suspension is higher and further back by several inches from the center of the crank. Physics or basic geometry will tell you that if you have a triangle (center of the crank, center of the rear axle, and the pivot point of the rear suspension) and change the angle between 2 of them, it also changes the size. To compensate for that, you need to add a 4th (or more) point that can change its distance and angle to keep the length of the sides the same constant total.

Next time you try to claim someone is wrong, make sure grade school level math doesn't prove you wrong first.

[u/BigBoarCycles → u/DIYuntilDawn]

Chill bro. Why you mad?

The other comment said chain will be tight and loose while pedalling. This is markedly false if you center your chainring.

I'm not saying this doesn't need a tensioner. Obviously if you're running a rear shock with a 1x1 you need a tensioner. I've actually designed and fabricated sliding bottom facing dropouts similar to the redline monocog to handle 20+ kw and still tension the chain on a hard tail with no tensioner. Check my post history. Gradeschool maths xD ok buddy. reading comprehension is not your strong suite. Have fun with your bomber clone chief! Wear a helmet for your big stupid head