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  1. teslanv

    35mm DD Hub build on a Full Suspension Comfort bike

    It's been a long time since I did an in-depth build post, but I've been so enamored with this latest build, I wanted to share the details of it with the Sphere. Lately, I've been focused on building great commuter bikes. Main considerations include moderate power (1500W-2000W), high...
  2. teslanv

    Standard formula for Calculating Ebike Range

    There is absolutely NOTHING more confusing to the inexperienced ebike purchaser that understanding potential range with respect to the ebikes they are considering. So many ebike manufacturers and retailers embellish range claims using tricks that we experienced ebikers know are deceptive at best...
  3. teslanv

    Rejected due to shipping "damage"

    Built this one for a customer. Box had a hole and a scratch on the rim, so he sent it back. Some days I question my own sanity...
  4. teslanv

    Extremely detailed video about Using LiPo on Ebikes

    4i_4_DcZTWE Chapters: Introduction to LiPo: 00h:01m:00s Some nice toasted LiPo for breakfast: 00h:10m:40s Wiring Harness: 00h:16m:55s Balance Charging with an RC Balance Charger: 00h:28m:58s Bulk Charging: 00h:46m:47s Capacity Testing your packs: 01h:05m:17s Product Links...
  5. teslanv

    Teslanv's Simple Stainless Steel Battery Enclosure

    I developed a very simple design for a rectangular Battery Enclosure. The Dimensions can easily be customized to fit any desired Internal Height/Width/Depth. This design allows for mounting to your bicycle's Water Bottle bosses with extra holes for longitudinal (front to back) adjustment in the...
  6. teslanv

    Modifying your Ebrake circuit for "Line Lock"

    This is a mod I did for a recent build. It's a simple inline switch added to my front ebrake circuit, that allows me to disable the front ebrake and still engage the motor for "warming up a tire". This is often referred to as a "Line Lock". I used a standard 3-position switch, that has a...
  7. teslanv

    Redefining the "SLA" ebike

    If you have been in this hobby for any amount of time, you have probably accumulated a vast assortment of random ebike parts. Add any kind of business activities to the mix, and you pile up LOADS of 1/2-working things, samples, silly project ideas and the like. So it is with this in mind, when...
  8. teslanv

    GNG Ultralight RC Mid Drive with Bluetooth control

    http://www.gngebike.com/ultralight-300w-kit I just placed an order for this little RC MId Drive that GNG just came out with. It will be going on a very lightweight XC Bike. I think this little drive has some potential, and looks to be a perfect fit for a brick of 6S LiPo, as the ESC...
  9. teslanv

    Teslanv's Super Deluxe IGH BBS02

    This is the 5th evolution of my BBSxx Series of builds, and my return to Mid-drives after an extended hiatus building and riding much more powerful DD hub bikes. I am thoroughly pleased with how this bike rides. I call this build "Super Deluxe" because In my humble opinion, it refines the...
  10. teslanv

    Do you ever go back and reread your first post on ES?

    I remember doing a lot of lurking before my first post. And even then I got so much wrong... https://endless-sphere.com/forums/viewtopic.php?f=3&t=55282 Anyone else willing to share their very first post on ES? :P
  11. teslanv

    MXUS coming out with a 5K-Turbo motor, 55mm Magnets

    Zpr6HhS2iVc MXUS sent me some info on a new motor they are going to be building, model number "XF5K" It is a 55mm wide magnet design, which is 5mm wider than either the QS 205 or the Cromotor. They rate it at "5000W" Here are the specifications we know so far: Stator Material: Unknown #...
  12. teslanv

    Custom Torque Arms designed and fabricated

    After designing a few different torque arms for various bike frames, I have a pretty good grasp on technique and attachment method. Generally, I like to use 1/4" thick 316 Stainless Steel, as it seems to be strong enough for most applications, and is readily available from my various sources...
  13. teslanv

    Installing a tubeless motorcycle tire on your Moto Rim

    As part of Kinaye's attempt to achieve ever higher top speeds and drag race times, we continue to experiment with various aspects of ebike performance. In our latest iteration of our Vector Drag Race bike, we upgraded our motor to a QS 205H 3T Motor, and installed it in a 2.50" x 16"...
  14. teslanv

    Teslanv's Giant DH Comp Ultimate Off-Road Ebike

    I picked up this frame from my local Craigslist yesterday. I was pleasantly surprised at how beefy this frame is, considering it's weight. As many of you know, the Giant DH frames are one of the best frames to build a high-performance ebike with, due to the superior rear suspension...
  15. teslanv

    MXUS 3000W and 1000W Motor can take the same Phase Current

    This post is meant to inform those who struggle with the relationship of windings and power as they relate to direct drive hub motors. I test a lot of MXUS direct drive Hub motors and a variety of controllers for compatibility. And I think I have a good understanding of how the relationship...
  16. teslanv

    Wiring Diagram for 2WD and a Single CA V3 with remote Shunt

    I have come up with what I believe is the perfect way to set up a two wheel drive system and to control and monitor it with a single Cycle Analyst V3. The attached PDF file was made with AutoCAD and individual layers can be turned on and off in the PDF, so you can isolate particular wiring...
  17. teslanv

    Motor size vs Phase resistance - how much power?

    Here's a question I am curious about. I understand that motor heat is directly related to how much resistance the phase wires have. And the lower the phase resistance, the more current a motor can handle. So I am wondering if you were to compare two motors of similar design, but different...
  18. teslanv

    Bafang BBS02 Vendor & Reliability Poll

    In the comments section, feel free to post a short review of the vendor you purchased from and kit itself.
  19. teslanv

    Direct Drive Hub Motor Calculator - Kv, Kt, Speed, Torque

    I have been slowly improving upon the excel spreadsheet I developed for the MXUS Direct Drive Hub Motors, including the XF40-45H 3000W motors and the XF40 27mm 1000W motors. I have come up with what I believe is a very accurate model of the relationship of Kv and Kt based on the winding pattern...
  20. teslanv

    How to build an Electric Bicycle by Teslanv

    I am hosting a 1-day class this Saturday, April 25 from 8 am to 5 p.m. at the Community College I teach at in Auburn, WA. $99 registration fee. Males & Females of all ages welcome. :) I will offer it again on Saturday, July 18th. This is a beginner-level class on how to build (convert) an...
  21. teslanv

    How to measure the Shunt resistance of your Controller

    I made a video to explain the process of determining the shunt resistance (Rshunt) of your controller. This method will work, even if you have modified the shunt to increase your controller's amperage, as it literally measures the actual resistance directly, based on a constant current from an...
  22. teslanv

    Simple Pedal Speed calculator

    I whipped up a very simple excel spreadsheet to calculate wheel & Ground speed based on chainring/sprocket tooth-count, tire diameter and pedal cadence. It includes two sections to compare two different systems/configurations.
  23. teslanv

    One Good marketing Plan is all we need

    If the success of the Storm campaign has taught me anything, it's that the US ebike market is just one good marketing campaign away from an LEV revolution. The Storm is nothing but a kit bike, with some cheap, but clean looking cover panels. We can do much better than this. I think ES needs...
  24. teslanv

    Direct Drive Hub Manufacturer/Vendor ratings

    I am looking for you to rate your experiences with the following Motor Companies that produce Direct Drive Hub Motors. Please choose "+" for "Thumbs UP" or "-" for "Thumbs Down", for each manufacturer or Vendor, or leave both options blank if you have no opinion. Cromotor...
  25. teslanv

    Silver Bullet - A 1998 Hoffman "George" BMX conversion

    I wish I was 8 years old again. :D Fortunately for my son, Harrison, who just turned 8, his dad is so addicted to ebikes, that he got every young boy's dream realized today. Powered transportation. This bike was impressively simple to build, once I had developed my solid game plan. The...
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