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  1. M

    Square Taper Spindle size & shape

    On the left is a Shimano BB-UN55. On the right a Sempu Torque Sensing Bottom Bracket from Grin Tech. The left crank arm worked loose for the 2nd time today. I didn't use a torque wrench the first time & installed it, but after that, I did & used 30 ft lb. (360 in lb. 40.7 Nm) which felt...
  2. M

    Finding a machine shop for a simple milling job?

    I bought one of the Grin Tech. GMAC motors for an old full suspension mountain bike frame with 51mm I.S. caliper tabs. The disc ends up being 1.5-2 mmm too far to the left (outboard). There isn't enough material to enlarge the holes on the caliper so I thinned the mount adapter by 2mm with a...
  3. M

    any non-thru axle full-suspension MTB besides B.D. HAL5?

    The Bikes Direct HAL5 series looks like it'll work for a project using Grin Tech's 9 Continent free hub motor, but I'd like to consider other bikes if there are any. I like the HAL5 because while it's not a 4 bar suspension, at least it's not single pivot. Seems everyone's moved to thru axles-...
  4. M

    high torque at 750Watts?

    I'm interested in building a bike that fits under the 750 Watt limit, but can deliver huge starting torque. It seems that if the mechanical Watts delivered by the motor is limited to 750, the torque at low RPM should be allowed to be huge. Looking at the ebikes.ca simulator...
  5. M

    28MPH pedelec in semi-separated bike lane in California?

    I'm curious 1. whether bike lanes with some physical protection at intersections but none along the block could be considered Class IV An example on Folsom St. in San Francisco. There's been a little reconfiguration after the Google's street view pass. For instance, at Folsom & 8th, there...
  6. M

    downrating a motor instead of gearing it down?

    John Tetz's low power assist seems like a perfect way for me to shorten my 10 mile commute by giving me a kick to cruise at 20MPH instead of 15. I've run across so many posts about detonating gearboxes (such as the Bane Bots P60s I was looking at) that while Tetz came up with a current limiter...
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