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  1. T

    Cycle Analyst speedo noise

    When accelerating speed reading jumps around, speed reads fine when not under power. I put a .1uf cap across the that hall I'm reading and ground. Still seeing unstable hall signal when under power
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    Sine wave controller recommendation

    I’m back on the sphere after several years, I have been using a 18FET BT controller from ES member PowerVelocity. The controller worked great for a few years albeit some beta Bluetooth problems. Anyway I blew some fets and fail replacing the failed fets so now I’m looking for controller...
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    What would happen if batteries with a voltage difference of 0.1v are paralleled?

    I have two 20s batteries, one 10ah and the other is 12ah both are multistar batteries. I would like to occasionally fully utilize my 18 FET controller without stressing the batteries too much. I plan on drawing about 70 amps when paralleled. My question is what would happen if there is a...
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    2004 Raleigh Ram build

    Here is my most recent build: 1500W leaf motor laced into a 19'' moped rim, 18 FET controller from Powervelocity.com, 20s 10ah of multistar batteries to abuse, second xt-90 connector paralleled to add an additional 12ah in a battery pack. I run it at about 3KW which is probably a little too...
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    What might cause an xt-90 anti spark mechanism to fail

    The title pretty much says it all. I've been using an xt-90 antispark connection on one of my 20s packs for about a year. It failed a while back (a few weeks after I had started charing to 4.2v/cell from 4.1v). The contacts appear to be clean on both the receptickle and the dingus end. Any...
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    aluminum life span

    I'm considering purchasing a 2003 specialized big hit frame. The frame appears to be in good condition, however, I have heard concerns about aluminum in the long term. Is the structural integrity more dependent on usage over that 15 year period, or the time itself? Many people rave about the...
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    repairing laminations

    I decided to open my one of my DD hubs to clean, paint and add aircooling holes to the side covers. I noticed some of the laminations are coming apart on one side of the stator. Should I just add a little epoxy and clamp them? Any general advice for repairing laminations?
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    geometry critique

    I had some parts laying around so naturally I justified a new build. I got a really cheap 29er frame, I read that some people said it has an oddly high bottom bracket so I thought that it would work ok with 19" moto wheel. The head tube angle seems reasonable, the bottom bracket seems to have...
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    Frame type

    I've really enjoyed the simplicity of my latest build; its a cr-mo ridged frame, single speed with widish tires with a ebay DD hub that I run at 2.5kw. I'd like to build another similar bike but perhaps with an air fork. My questions is about frame types; I'd like to find one with horizontal...
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    Adding new li ion cells in parallel to an oldish pack

    My 1.5 year old 48v "20ah" battery has always sagged under load, I typically see a 4v drop using a standard kit controller (26 amps I think); now that it's getting cold out it starting to sag a little more. There are probably around 2000 miles on this pack with maybe 80-90 full charge/discharge...
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    li ion charger for lipo

    Can a charger like this http://em3ev.com/store/index.php?route=product/product&path=35_37&product_id=153 be used for lipo? It has variable voltage so I could bulk charge a 20s pack most of the time and balance occasionally to preserve the connectors. It is explicitly for li ion but would it...
  12. T

    controller failure

    As I'm riding down a hill using regen, my motor goes from nearly silent to producing a grinding noise/feeling. I checked the connections and they are fine, could it be a damaged hall sensor? The motor would occasionally spin from a standstill (still grinding) sometimes I will get no response...
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    over torquing axle nuts?

    The picture says it all, the bushing(?) is deforming a little bit. It looks like it is a result of too much compression
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    Anyone build a 2920er?

    I've been riding the "69er" that I've slowly been suiting to my needs over the past few months. At first glance it's not quite apparent that there is a 26 inch rim and 29 inch rim because of the larger 2.5 inch hookworm tire making the diameter in the back 27.5 inches. As I'm contemplating...
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    Lyen "soft start" programing

    Bombarding the forum with questions today. I know I could PM Lyen as he has always been super helpful and prompt but I've asked him so many question over the past year I think I'll give him a break. I have a modded Lyen 12fet controller, I plan on doing the resistor mod to increase regen...
  16. T

    Single speed build up

    I'm feeling productive today but I work 10 hour days for the next few days so I'll try to get all the advice I can before I have time to start getting everything together. My Kona Unit build (recently completed rim/spoke/tire upgrade) has a pretty low gearing (32t chainring and all I had for...
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    Wheel broke so I wheel build

    Sorry about the pun in the title, I had to. Anyway, I took an extended ride home from work and ended up walking a few miles because of this.. You can see the carnage, I need to build a new wheel.. The motor is a generic 1000W DD After some ES perusing and ebay searching I bit the bullet...
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    direct drive "grinding" over bumps

    On my 1000W direct drive rear hub motor kit I have been experiencing some trouble -- on every pothole or slight bump in the road the motor seems to seize up momentarily, it creates a very brief grinding feeling. The phase wires exit through the axle and have gotten pretty beat up, I plan on...
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    Throttle pulsing when light is plugged in to CA

    I just bought a 20W led headlight that I've connected to the pack voltage via the CA's 5.5x2.1mm power plug. The light works fine, however, whenever the light is plugged in the throttle does't work properly; depressing the throttle completely only results in pluses of power. The problem goes...
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    scrap battery box built with minimal tools

    I don't have too many posts about my bikes but I figured I should share how I made a simple battery mount in the triangle using some old filing boxes and a terrible light mount that came with the purchase of the 20 watt headlight. I haven't used this 20Ah AODA battery for a while because 5 or...
  21. T

    Rear disc brakes worth the hassle?

    My third build is a "69er" 1000w generic ebay hub on a kona unit; I got a threaded disc brake adaptor that screws onto the flip flop hub. I was expecting some clearance issues with the disc brake calipers but I didn't think it would be as far off as it is (maybe 12mm). I'll post pics when I get...
  22. T

    15s in a 48v controller

    I have a 48v controller with caps rated for 63v. Has anyone had success with charging 15s to 4.1v while using a similar 15 fet controller? I know its pushing it and I know the LVC wouldn't save my batteries from over discharging. It would just be for a short period of time until I receive some...
  23. T

    Source for sliding steel dropouts?

    I bought a 2013 Kona Unit that I plan on converting, the only problem is the sliding dropouts are aluminum. Does anyone know a source for steel sliding dropouts? Will a torque arm or two with the stock 7mm thick sliding aluminum dropouts be sufficient for a measly 1kW/1.3kW peak direct drive...
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    Modifying generic 15 FET ebay controller

    I have an extra controller from a generic 1000w 48v hub motor from ebay. I've open it up and managed to set up a three speed switch (which is not advertised at all -- I suspect that the manufacturer realized that 120%(?) would draw too much current from the crappy 10-15 AH prebuilt batteries...
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    need help choosing compatible components

    So I recently bought a bike on craigslist only to find a crack in a swing arm linkage after Bowlofsalad pointed it out on a torque arm discussion form. So I've decided to take a different approach. I'm planning on buying a raw steel frame, something with the same specs as this...
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