Recent content by morganw

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...

I have an Analogger & I'm not seeing anything helpful. It only logs human power and RPM, not raw voltage from the torque sensor or computed Nm torque. Here's a trip where I only pedaled for a hill & getting away from stops. The hill is from 0.711 to 1.152 km. Edit: the Analogger has two extra...

I only need high-ish gears. With my 6'3" sitting upright in the wind, I need to add 100-200W to the motor's 750 to get from 20 & a bit MPH up above 25MPH. For helping the motor starting from a stop on a flat, the big ring with the next-to-lowest or next in the back (cross-chaining, yes) is...

2004 Santa Cruz Blur from Craigslist with Grin GMAC 10T kit w/ 52V 16.5A Hailong battery, Phaserunner & Sempu torque sensing bottom bracket. Was going to buy a BikesDirect HAL5, one of the last full suspension bikes without thru axles in the back, but an e-s'er convinced me to keep checking...

Once I started looking at cheap mills, I ran across "mill/drills" and a lightbulb went off. I don't even have to put sideways force on the drill press I already have. I can just mill down a circle 2mm into the adapter, pull the mill up, slide the piece over and mill another circle until the...

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...

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-...

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...

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...

I will! I don't mean to pry, but Tailwind has been used in cycling at least two times before. The USPTO has a dead registration from Dahon. Schwinn (Dorel) currently uses it for their electric bikes, but they don't put a trademark or registered trademark symbol next to their use of it at...

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...

I understand completely. I'm going to try to build a similar design for a monotube SWB recumbent, but I'll still buy one of yours (I'm watching for your "ready to take orders" post :D ) for a diamond frame. You're right. The photos from all angles are very helpful. I think I'll build a...

What happened to the drawings? Based on a quote of this post, I think they were attached, then edited away. Can they come back? Please?