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Drivetrain swap on Lankeleisi MG740 Plus

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Drivetrain swap on Lankeleisi MG740 Plus

Old 06-16-24, 09:02 AM
  #1  
E-Fatbike
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Drivetrain swap on Lankeleisi MG740 Plus

Hi, Iím brand new to anything about bikes so excuse me if I lack knowledge, vocabulary, precision or anything else.

So I recently acquired my first bike, a Lankeleisi MG740 Plus fat bike off leboncoin (Franceís eBay) and noticed that even though itís made in China the bike frame and motor/ battery is great quality. That said, Iím having a lot of problems with the entry-level drivetrain on such a huge and powerful bike. It consists of a 7 speed shimano freewheel (I believe 14-28t?), shimano altus derailleur and tourney shifter. Iíve counted 120 links on the chain and the chainring is 46t. The shifter already broke on me (stuck in 7th gear), I had to straighten the derailleur multiple times and since it has a high top speed Iím always ghost pedaling. I broke the bottom bracket (100mm long and 40 mm wide) so I decided to go and swap the entire thing out and upgrade it, this bike being my go-to vehicle for pretty much anything. Problem is, itís been a week of searching and learning about fatbikes and e-bikes and I still canít seem to figure out what is good for my bike and what is compatible or not. I started looking into SRAMís downhill groupset but figured out it would not be compatible. Iím kinda stuck and canít seem to find decent quality, durable and compatible parts, heíll even just parts that are the right size !

Any suggestions/recommendations/help would be greatly appreciated. Thanks in advance !
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Old 06-16-24, 01:09 PM
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I'd start with a list of the specs for the bike - what's the bottom bracket, what's the chainline, the rear wheel spec, etc.

If you've broken that much stuff, this bike is not as high quality as you think. Do you think this is maybe better in the ebike section? I'm anti-motorcycle.
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Old 06-16-24, 05:38 PM
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Originally Posted by Santi_Does_Know
Hi, I’m brand new to anything about bikes so excuse me if I lack knowledge, vocabulary, precision or anything else.

So I recently acquired my first bike, a Lankeleisi MG740 Plus fat bike off leboncoin (France’s eBay) and noticed that even though it’s made in China the bike frame and motor/ battery is great quality. That said, I’m having a lot of problems with the entry-level drivetrain on such a huge and powerful bike. It consists of a 7 speed shimano freewheel (I believe 14-28t?), shimano altus derailleur and tourney shifter. I’ve counted 120 links on the chain and the chainring is 46t. The shifter already broke on me (stuck in 7th gear), I had to straighten the derailleur multiple times and since it has a high top speed I’m always ghost pedaling. I broke the bottom bracket (100mm long and 40 mm wide) so I decided to go and swap the entire thing out and upgrade it, this bike being my go-to vehicle for pretty much anything. Problem is, it’s been a week of searching and learning about fatbikes and e-bikes and I still can’t seem to figure out what is good for my bike and what is compatible or not. I started looking into SRAM’s downhill groupset but figured out it would not be compatible. I’m kinda stuck and can’t seem to find decent quality, durable and compatible parts, he’ll even just parts that are the right size !

Any suggestions/recommendations/help would be greatly appreciated. Thanks in advance !
What's the goal?

Taking a guess, I'll assume higher durability.
The derailleur could be stuck due to derailleur damage, stuck cable, stuck shifter.
Best to figure out why there's a problem before replacing parts that may or may not be broken.

How many miles?

There are many MANY choices on drive trains. More gears, more gear ratio range, lighter.

On an e-bike, the drive trains tend to be lower quality since they aren't dependent on the meatbag power supply.

A bike shop can do a once over and immediately tell what the problem is.
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Old 06-17-24, 03:38 PM
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It is an e-moped and not designed to last long. You could put money towards it but honestly I would save it towards a more practical bike. Fat bikes are great for sand and snow and e-mopeds are great for existing but when you see Shimano Tourney there is really not a lot of point in putting a ton of money towards the bike and just ride it till it finally breaks. You will likely be dealing with a cheaper freewheel set up and that limits a lot drivetrain wise as freewheels as you add more gears get even less reliable and durable.

If the bike is semi-functional as intended by the people who put a logo on it, then enjoy it and ride it. If you are really just looking for a moped I would get a proper electric motorcycle or moped that isn't designed to seem more like a bike. Me personally a good mid-drive e-bike will be more practical. If you see something below 9 speed run away and if you see mechanical brakes or unknown brakes keep running. It will cost more initially but will likely work better and last longer and also have better support behind it. Plus if you go to a bike shop you will be able to test ride them and they can help you pick out a more practical one and also support your purchase where the online stuff doesn't want to.
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