u/Lordy8719

Hi Y’all!

Years ago I’ve bought a Samebike 20LVXD30-II because I’ve needed a folding ebike.

The build quality was quite bad, so I’ve made it into a project bike and ended up removing the original hub motor and installing a Tongsheng TSDZ2B mid-drive, among other things, like replacing the tires, adding hydraulic 4-piston brakes, Racktime pannier rack, etc. At this point, only a few parts are factory, like the frame, the rims and the battery. Everything else has been upgraded.

It was fun and working like a completely different bike (which it was, honestly), but now we’ve travelled to rural Greece for a 2-months long trip, and at week 3, I’ve noticed that there’s a bit of a rattle going on when the motor is powered.

The hills are really steep here, for example, going to the neighbouring village is a 7km ride, but with 500m elevation. The TSDZ2b can’t really handle the heat going on. The factory battery of the Samebike (marketed as 10 Ah but more like 8Ah) is also not enough here, I can barely get 30kms of riding out of it at assist level 1 (I only use assist level 2 out of 5 on super steep climbs)

So as far as I see, my options are the following:

• buy a new battery, cooling kit, fix whatever was damaged by the climbs and is causing the rattle (about 600 EUR and days of work)
• buy a new battery and a Toseven DM02, sell the Tongsheng (~900 EUR-ish, somewhat less work)
• buy a new battery and a CYC Photon Gen 2 (~2000 EUR-ish, same work as any other mid-drive install)
• buy a Cube Fold Hybrid 545 Comfort with the belt drive, sell off this bike (~3500 EUR - whatever I can get for my bike)

What would be the reasonable solution? Throwing another 2000 on a bike that originally costed 700 seems unreasonable, but the CYC I could just transfer to my next bike, provided it won’t start dying like these cheaper mid-drives. Buying the Cube would be a simpler solution, but it’s an “as is” solution with no chances of ever changing anything.

Hi Everyone!

My girlfriend has "inherited" my old EbikeSpecial eFirenze 20" folder from me about 2 years ago, and she's been having a blast with it.

She loves the form factor, which is perfect for a petite woman weighting 48kg, I've did some necessary upgrades over the years: hydraulic brakes, Shimano Altus rapid trigger shifter, etc.

An issue she had with the super basic controller (generic controller with G51 screen) was that PAS was very erratic and since she doesn't have much mass, whenever PAS decided to engage, the bike essentially JUMPED, which was super dangerous when we were exploring on some bike trails in Croatia.

So after we got back from our trip, I've started rebuilding the bike. I've first bought a KT sine wave controller + display + sensors set. Imitation torque is far better than the generic controller was, takeoff is soft, easy to control.

However, there's some weird buzzing that keeps occurring at random with the KT controller. I've replaced the controller but it happens with the new one too. It seems to be related to the P1 parameter.

What I did for troubleshooting:

• Built a test harness and checked if all hall sensors and phase wires are well connected and the order is right.
• I've tested the Hall sensors in the motor
• I've tested P1 from 50 to 120 and settled with the one that made the motor run the best

My GF says that this is not a dealbreaker but I like to do quality work with my tinkering.

Recently I've seen that Lishui apparently makes controllers with torque sensors (T15, T17 and the likes) and I've been thinking of trying one out.

The system I'd like to integrate it with:

• "XOFO 7.820.100A5" 36V 250W hub motor (9 pin Julet plug)
• 36V battery in great condition
• hydraulic brakes with 2-pin brake cutoff signals
• BB size is a bit odd, BB83

The controller kit I've found:

• T15 or T17 BB83 torque sensor
• Lishui LSW1728-1-1F controller with S2 display
• (don't know what else I might need, maybe a throttle and compatible lights?)

Does anyone have any experience with these?

Hi all,

So my GF has inherited my old 20" folder (a Chinese ebike assembled by a local company).

It's a 250W "XOFO 7.820.100A5" hub motor at 36V. The bike was originally supplied with a low-quality generic controller with a very jerky startup which was an issue for my GF as she only weights 48 kg, so startup/stopping was super erratic for her.

To make the rides feel better, I've decided to replace the generic controller, G51 screen & all with Kunteng parts, I've bought a 15A sine-wave KT controller, new screen, PAS sensor, etc. All connected via Julet plugs.

Ramp up and general use is significantly better now with the imitation torque assist mode, but there's one remaining issue: at around 180W, just normally cruising on a slight elevation, there's a noticeable rattling noise coming from the controller (at least, I think it's coming from the controller and not the motor).

According to GPT, this is caused by the P1 setting not being set up correctly, so I've been experimenting with it, but I couldn't get it disappear completely.

Does anyone have any tips for me to set P1 correctly besides trial and error? Or should I try a different controller instead?