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  1. I

    Help Needed to figure out how to remove wheels on unusual German (Draisin) Trike

    Hi folks Got some broken spokes on the rear wheels of one of my trikes so need to get the wheels off. However, they aren't held on by a nut or in any way I can figure out, never seen anything like this before. The hole in the side of the hub doesn't have a grub screw in it, it seems to be a...
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    Controller with LCD display?

    Hi folks The 48v 1000w controller that came with my hub kit has given up the ghost, dead. So I thought, instead of replacing it with an identical one, why not have an upgrade to one that has an LCD display. Just looking for some feedback from people who have owned and used these things before...
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    Feedback on ebay mid drive kit?

    Hi folks This 700w kit is quite cheap, anyone got any experience with them? http://www.ebay.co.uk/itm/ELECTRIC-BIKE-KIT-48V-60V-700W-BRUSHLESS-NEW-UPGRADED-MID-CHAIN-DRIVE-MOTOR-/131599453004?hash=item1ea3f04b4c:g:Ld8AAOxy5rpSTvvM The bafangs, being 250w don't appeal to me much, although the...
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    Headtube - need new bearings, help identify type

    Hi folks I know nothing about the different types of bearings, all I know is when I was putting a new set of handlebars on one of my bikes, all the ball bearings fell out of the headtube, so I need to replace them. How do I identify what the correct part I need is? I see a ton of different...
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    Have a laugh at my expense - I need to relearn to ride!

    Finally got my ebike working. Took it for a test, fell off after half a mile. Has anyone else had the experience that cornering on an ebike requires a bit of a different technique? Or maybe I needed to slow down a bit more, although I didn't think I was going too fast. I haven't fallen off a...
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    Where can I buy a left side sprocket?

    Hi folks I;m looking to find a sprocket of at least 48t to fit on the left side of my rear wheel. The hub has the 6 bolts for a disk brake so I was wondering if it is possible to buy a sprocket that will mount using those 6 holes, like a rotor?
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    18650 pack got extremely hot - WTF?

    Hi folks I soldered together an 1850 pack earlier, 13s12p. After I'd finished the multimeter shows a bit over 50v, so all seemed fine (not fully charged). Had a break for a couple of hours and went back to work, picked up the battery pack and nearly dropped it as one part of it was really hot...
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    How to wire two brushless motors in series?

    Hi folks I have two 24v motors which I want to run in series using a spare 48v 30A controller I have (the motors are rated for 23A). What I'm wondering is how will it work with the hall sensors? i understand how to connect the power in series, that's obvious, but I'm clueless about the hall wires.
  9. I

    I think I'm a big sissy, but.....

    Finally finished my first ebike build today. Put a pair of '1000w' Chinese hub motors on my old Kona MTB and built a pair of 48v 20Ah 18650 packs for it. It's just too powerful, this thing isn't an electrically assisted bicycle, it's an electron fuelled rocketship. The tires and lightweight...
  10. I

    Any issues with going 13S 18650s on 48v controller?

    Hi folks I have a pair of 48v battery packs I made using laptop grade sells in a 12s10p config. My bike uses a pair of 1000w ebay hub motor kits. The controllers with both motors are identical but I don't know who made them. They are marked 42v LVC. I am worried about the amount of sag I am...
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    48v PSU for charging

    Hi folks My bike has two 48v 20ah batteries I made from 18650 cells, they are 12s8p so 50.4v fully charged. They each have a BMS for charging, I have wired them both to the same socket. Now I need to select a PSU. There are lots of 48V 7.5A units on ebay cheap and they have a adjustment pot...
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    Upgrade tires that came with chinese 1000w kit?

    Hi folks I've only done a few miles on my new bike with a pair of 1000w Chinese hub motors, running the tires that came already fitted, and I'm not all that confident they grip all that well. I do 90% of my riding on tarmac, so I was wondering what people recommend for a replacement/upgrade to...
  13. I

    Big pancake motors on ebay UK

    I have no connection to the seller, just spotted these and thought I'd share as they look ideal for building a very powerful bike. 48V 8.5kW: http://www.ebay.co.uk/itm/172299237913?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT 24V 4kW...
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    '250w' hub motor - what will it really take?

    Hi folks I picked up a front hub motor from a Raleigh Velo XC bike and as with all bikes sold in the UK, it's rated at a supposed 250w. It's a 36v motor but I have no idea who made it or it's specs. The bike it was intended for was fitted with a puny 8ah battery, so I'm wondering how many...
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    Battery building woes

    Hi folks I made a 4s10p pack from Chinese cells from new laptop batteries, I happened to have these cells and decided to use them to practice my soldering technique. I had done a full charge-discharge test on every cell to check they were working and what their capacity was. It worked...
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    Battery pack destroyed by too high charging current?

    Hi folks I built a 48v battery pack for my dad a while back, it worked great, 96 Samsung 26F cells in a 12s8p setup. Long story short, he connected up a 48v 7.5A PSU directly to the battery terminals for an hour, figuring this would do a rapid charge. Since then, the battery has registered...
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    WARNING: Gearbest sold me FAKE Samsung 18650s

    Hi folks I recently built two 12s 8p 48v battery packs using Samsung 2600mAh cells. All of the cells were from unused laptop packs apart from four that I bought from Gearbest: http://www.gearbest.com/batteries/pp_190732.html I charged the pack and ran it for a couple of days on my bike...
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    How to wire BMS

    Hi folks I bought two BMS boards to connect to the two 48v 20Ah batteries I have made for my bike. However, the terminals on the boards to connect to the 48V PSU are a mystery to me. They are labelled C, B and P so I have no idea how to connect it to the 48V positive and negative from the PSU.
  19. I

    Wiring two controllers to one throttle - no wiring diagram

    Hi folks I'm trying to connect both of my controllers to one throttle. The controllers are the same model, but no idea who made them, so don't have a wiring diagram. The connector for the throttle is the same on both controllers and has 6 wires, Red, Black, White, Green, Brown, Yellow. I'm...
  20. I

    Two controllers and motors, one pas sensor?

    Hi folks I'm building a dual hub motor bike. It's running on one motor a the moment, not connected the second one yet but it's installed. I know how to wire up both controllers to one throttle, but I'm wondering about the PAS sensor. Obviously, the way it is setup now, with one motor, the PAS...
  21. I

    Help me with brake confusion

    Hi folks I need to buy a set of brakes to replace the crappy things on an MTB I just electrified with a 48v 1000w hub motor on the front. A disk brake won't fit, the frame lacks the brackets and the forks aren't wide enough to fit the motor with a disk mounted on it. So it's rim brakes. After...
  22. I

    Two hub motors on one bike - 2WD

    Hi folks I have a 48v 1000w hub motor on the front of my bike with a 48v 26Ah battery. I have enough cells to make a second identical battery and space to mount it. So I'm thinking of adding a second hub motor on the rear, identical to the front one, same motor and controller. Is it a simple...
  23. I

    Cheap Chinese 48v 1000w hub motor

    Hi folks I've got a 48v 1000w Chinese kit from ebay, just fitted it to my Kona MTB today. The battery I'm building for it is a 12s 8p of Samsung 26F 2600mAh 18650s. These have a 2C constant discharge rate so they will put out 5.4A continuous. 8x5.4A = 43.2A. So the battery is a 40A output...
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    Electronics needed to run 3 phase induction motor on dc

    Supposing I have a 3kw 3 phase AC induction motor sat here doing nothing and I wanted to run it on dc from a big lithium battery pack. What electronics are needed? I've tried to figure this out from looking at various sites and I; m flat out confused. A brushless dc motor is a 3 phase moptor...
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    Revive Roodog 36V 10A LiPo battery in deep sleep

    Hi folks I've just bought a brand new unused Roodog Chic eike for my dad. British built bike, 899ukp but I paid just 160ukp because the battery is not charging. It's been sat for a year so has deeply discharged below the level the BMS will allow charging. I took the end plate off the battery...
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