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  1. O

    Electric bikes are really cutting emissions

    EVs are booming but electric bikes are really cutting emissions
  2. O

    Has anyone welded a Grin torque arm?

    The v3 All-Axle torque arm attaches in one orientation only - the splines and screws are not radially symmetric. I have a use case that requires the arm be rotated 90 degrees from it's built position relative to the motor. Justin suggests cutting it and welding it, and mentions it's 6061. But...
  3. O

    A comment on the Grin v7 torque arm assembly

    As pointed out yesterday by the fabricator I am working with (Quantum Bicycles in Perth - I don't have a shop and they really know what they are doing). With the Grin v7, there are two pinch bolts to provide serious compression on the axle clamp. The comment is to tighten them progressively -...
  4. O

    Reverse by back pedaling - Grin

    I have read fleeting references to a function of Grin kits where back-pedaling will invoke regen or invoke reverse. I read that a 2-wire cadence sensor will signal this, and I have the 24-pole sensor Grin sells, and on the SETUP PAS DEVICE screen on my Cycle Analyst (v3) I can see the two...
  5. O

    practical field weakening

    I need to spend time with diagrams and reading to understand the technicals of field weakening beyond the basic idea of advancing the motor phase. This means explanations in math aren't useful, and aren't what I'm asking for. I won't learn much if your answers are phrased this way and you...
  6. O

    Electrics are better than Fossils in cold

    Electric vehicles fail at a lower rate than gas cars in extreme cold
  7. O

    Baserunner v4 regeneration voltage limit

    I have read through the manual, and don't recognize an answer to this question. If the speed is high enough when regeneration happens, the voltage can exceed the voltage of the battery (48v in my case, but up to 52v nominal for a Baserunner). I've read some suggestion that when this happens...
  8. O

    Torque sensing bottom bracket for Efneo planetary

    I have an Efneo 3 speed planetary crankset. They are not responding to emails. Does anyone know if there is a torque sensing bottom bracket that works with the Efneo? The left crank and the right gearset/crank are square taper. Thanks.
  9. O

    What is VESC?

    I searched in this web site, and in google. I found the VESC web site. I find detailed docs on electronic circuits and coding systems. I don't find much of any statement in one place about what VESC is. Can someone point me?
  10. O

    Two motors in series?

    My current build uses a GMAC as a 'stoke monkey' motor, with a Gates belt connection from the left side of that to the left side of a rear ("dirt jump") hub - there is no cluster or chain on the right side of the rear hub. The rim is 26". I have a wheel with a Grin All-Axle front with a 26"...
  11. O

    Reverse with Grin Phase/Baserunner

    I have a long trike with a large turning radius compared to upright bicycles using a GMAC, Baserunner, CA3. I want to be able to reverse the motor. I have read another thread here pointing out there is a wire in the 'mains' connector of later Baserunners and Phaserunners and if I ground this...
  12. O

    Source of alumin(i)um or maybe steel tubing

    My Greenspeed Magnum seat is welded aluminium tubing - two bent side rails connected with three cross rails. I need to duplicate it with some changes. The tubing is 25mm OD and 2.5mm wall thickness - so 1" and 0.1" thick. The middle cross rail must be removed, so some change to stiffen the...
  13. O

    Bar end shifter for Shimano CUES?

    I have a Greenspeed trike, and it uses bar-end shifters. I want to change the derailleur and Shimano's CUES system is intended for longevity. Shimano only provides trigger shifters. Does anyone have a recommendation for a bar-end shifter that will work with CUES? My trike currently has 10spd...
  14. O

    Question about Grin All-Axle rear motor

    I designed the motor carrier for my trike based on what I knew about this motor before it was released (Justin said it has the same outer envelope apart from the free hub). Can someone who has one tell me: Is there only one position for the torque arm attachment to the motor? It appears that...
  15. O

    Gates 22-26T sprocket for ISO 6 bolt mount

    CDX preferably. Or do you know a source? Thanks.
  16. O

    tolerance needed for adapter?

    I will have an adapter made to bridge between the 6 bolt 44mm BCD ISO brake rotor mount on my hub to a 4 bolt 104mm BCD Chainring. It will turn at bicycle speeds - perhaps 500rpm. What positional tolerance would I specify to ensure adequately minimal problems due to out-of-round? Any...
  17. O

    Advice about over-driving a chain driven motor

    I have put together a trike with a 'Stoke Monkey' motor. Here is the build thread: Greenspeed trike with stoke monkey Currently it is running with 16T at the motor, and 22T at the rear wheel: 11:8. I have a GMAC 8T motor. Justin commented that I consider down gearing. I'm thinking of 20T at...
  18. O

    Elejoy Adjustable 400W Solar Boost MPPT

    ... as sold by Grin Technologies and others. The manual (on page above in 'Product Attachments' seems contradictory. On page 2 of the manual, it states the device will not turn on with an input voltage of less than 14V. On page 4 it shows a table that suggests it will work with a 'nominal...
  19. O

    Electric 2021 Cruzbike Q45

    I have documented this in the Cruzbike forum with technical detail. Early in the thread, another rider gives some details of his conversion, but he also actually took a grinder to his motor over concerns the spinning brake rotor would damage the motor cable. If you read further, I detail the...
  20. O

    Greenspeed Magnum Big Wheel with 'stoke monkey' motor and Gates Belt drive

    There's more to do, but this works well now.
  21. O

    22T or larger single speed sprocket for ISO 44mm brake rotor mount

    You can see what I am asking about here: https://velosolo.co.uk/shopdisc.html I have 16T sprockets from them, I need a 22T, 24T, 26T, or even 28T one to match, mounting to the brake rotor mount on the hub for 1/8" and/or 3/32" chain. I have already used Problem Solvers sprockets - they work...
  22. O

    22T or larger single speed sprocket for ISO 44mm brake rotor mount

    Details here, please: https://endless-sphere.com/sphere/threads/22t-or-larger-single-speed-sprocket-for-iso-44mm-brake-rotor-mount.119871/
  23. O

    Identify battery charging connector, please

    Cap Rouge uses this connector for battery charging input. They were calling it an 'ST3', but no one else seemed to have the same connector as an ST3. Now they are calling it a 'micro XLS'. I don't find that with Google at all. In the 4th picture in this listing, they show the connector. I...
  24. O

    Accurate measurements of a Greenspeed Magnum BW

    Can anyone provide or point me to a complete set of measurements of a Magnum BW model trike? Engineering drawings would be excellent, but hand-made measurements would do. I have ordered one, but will not receive it until late December or possibly January and I want to begin designing some...
  25. O

    Crystalyte 20mm SAW Motor 48V?

    Can I run this motor on 48V, or must I use a 36V battery? https://ebikes.ca/msaw20f.html I would be using it with a Grin Baserunner & CA. Thanks, sadhak
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