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    Sur-Ron - New Mid drive Bike

    VERY INTERMITTANT POWER AFTER HIGH SPEED RUN? I ran my 72V Sur-Ron up to ~48MPH for a minute or so on a road and after I slowed down it sort of shut off. It was a cool day but I assumed it was a heat related problem. I waited a few minutes and tried it again and it would run but was VERY...
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    Sur-Ron - New Mid drive Bike

    The CHI Battery is a Very interesting product! I have 3 questions (which I just posted on their Facebook page. 1 - How is it that you are able to get so many Watt Hours into a pack that is only a little bigger than the stock SurRon and much smaller than competitors (like Lite Speed) need for...
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    Sur-Ron - New Mid drive Bike

    I have a litespeed 20s10p 72v40ah Using Molicel P42A 21700 Cells that is at least as tall as the one pictured below. So my question is how did you get 42 KWH into the same size or smaller package???
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    Sur-Ron - New Mid drive Bike

    Stasus - The battery in your picture below doesn't seem large enough for 4.2KWH of batteries? Can you tell us what type and quantity of cells you are using?
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    Sur-Ron - New Mid drive Bike

    The peg lowering kits also solve this problem.
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    Sur-Ron - New Mid drive Bike

    Thanks for all the great info on my LIPO question. I'm new at this and am OLD Dummy so hopefully you (or someone) can help me some more. I THINK? it looks like I could get 3 of these https://hobbyking.com/en_us/turnigy-high-capacity-16000mah-6s-12c-multi-rotor-lipo-pack-w-xt90.html and a...
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    Sur-Ron - New Mid drive Bike

    Is there a way to use one (or more) of the small light weight battery packages normally used for model airplanes as a BOOSTER for the SurRon stock battery? It would seem it would be easy to carry one or more of these to use as a range extender? These batteries are available in a variety of...
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    Bionx Battery Technology?

    I purchased a Bionx D500 system in Feb 2015 - shortly after they first became available. It has a 48V 11.6Ah battery. In the last year or so most of the eBike companies have come out with ~20% higher capacity batteries in the same size and weight package - due to going to the newer technology...
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    Rebuild/Upgrade for Bionx d500 Battery

    https://www.electricrider.com/bionx-lithium-battery-upgrade-replacement-p/bionxrebuild-13.2.htm Does anyone have any info/feedback on this?
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    Mid Drive Motors that mount ABOVE the Down Tube?

    I THINK I've seen some newly released motors that are designed where they can mount above/behind the down tube - BUT now I can't find them. Can anyone provide a pointer or link to help me out? This would seem to be a good solution for a tandem that has the eccentric bottom bracket and...
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    Front gearless hub drive for tandem

    One hub motor that works well in steep hills with a tandem is the Bionx d500. It is NOT a front hub motor and is not cheap but is a good system. I have one on a Santana RIO 26" wheel road tandem and one on a Ventana ECDM full suspension MTB Tandem. Our typical rides are close to 100' of...
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    Thorn Expedition TANDEM with BBS02 750W? Anyone??

    I was considering this a while back and also wanted true torque sensing. I came up with the following complicated solution but never implemented it. (Got a Bionx D500 system instead). E-Tandem with Bafang BB02 Mid Drive, THUN Torque Sensing BB & Triple Crank+ I THINK I have come up with a...
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    Highest Torque Low Speed Hub Motor for MTB Tandem?

    The Barfang COULD work but has MANY issues. The aluminum BB with eccentric makes fitting the motor problematic and you loose the timing chain adjuster. It is also questionable if the rear cogs/cassette can handle the torque of BOTH human and motor power in the lower gears. We have folded...
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    Highest Torque Low Speed Hub Motor for MTB Tandem?

    I've learned that the motor controller limit is 30Amps SO theoretically it is possible to get 1440 Watts at 48V. Also the MUCH larger motor diameter dramatically increases the lever arm for the power application thus effectively like gearing it down. Looks very promising AND it has torque...
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    BionX D500 DV Information

    I have recently found data on the latest and most powerful Bionx D500 DV system. I had dismissed Bionx based on the relatively weak power of the earlier systems BUT it appears this one is a BIG step up on the torque output and is relatively light. I LOVE that it has built in torque sensing...
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    Highest Torque Low Speed Hub Motor for MTB Tandem?

    I have recently found data on the latest and most powerful Bionx D500 DV system. I had dismissed Bionx based on the relatively weak power of the earlier systems BUT it appears this one is a BIG step up on the torque output and is relatively light and comes with a very wide 26" rim (which is...
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    Highest Torque Low Speed Hub Motor for MTB Tandem?

    I'm looking for the highest torque low speed rear hub motor I can find for a tandem off road only mountain bike. This motor appears to have the best characteristics - BMC V4 TT (Double Torque) Geared Front Hub Motor Kit - http://ebikessf.com/node/363 - BUT it appears to be unavailable in a...
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    Manufacturers/Dealers to Gravitate Towards

    I have been VERY happy with the products and service provided by Long Island Electric Bikes. I purchased a Haibike Xduro AMT Pro 27.5 (with the 350 watt Bosch system) from this firm (owned by Chris Nolte) from their original shipment in July. I love the bike and have had excellent follow up...
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    Highest Torque Low Speed Geard Hub Rear Motor?

    I'm thinking of adding a rear geared hub motor to our ECDM Ventana full suspension MTB Tandem. (Using a front hub motor is complicated by the upside down Maverick DUC32 Air Forks) So I'm looking for ideas on what rear hub motor will work the best at the very LOW speeds and steep hills that one...
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    BMC V4TT

    The only listing I could find was for a V4T (vs V4TT) Do you know of a V4TT listing? http://www.ebay.com/itm/HPC-STRIKER-Ultra-Efficient-Geared-Hub-Motor-BMC-V4T-V4-Torque-Electric-E-Bike-/121260245047?pt=LH_DefaultDomain_0&hash=item1c3bac8037
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    Sierra Climber High Torque Geared Hub Motor?

    I'm told It is a MAC.
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    BMC V4TT

    Anyone have any data or reports on the new BMC V4TT? http://ebikessf.com/node/371
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    LightningRods mid drive kit

    The daVinci cranks are designed for very short bb axles and might give you the needed clearance http://www.davincitandems.com/components/
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    Sierra Climber High Torque Geared Hub Motor?

    Thanks for your response. Our combined weight is ~ 300 lbs. your 80 lbs estimate for the rig sounds good. SO this is a heavy load - BUT even though we are OLD (71 & 70) we are still reasonably fit and have very low gears on our tandems and we WILL BE PEDALING pretty much all the time. We...
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    Sierra Climber High Torque Geared Hub Motor?

    Thanks for your response. Am I correct in my understanding is that you think the BEST High Torque geared hub motor available for my use would be the MAC? If so - Can you recommend the particular MAC model/configuration that I should consider. (see also my next post responding to dogman's...
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