Search found 68 matches

by LeftCoastNurd
Oct 20 2020 11:40pm
Forum: General Discussion
Topic: What is a good source for larger cranks and sets
Replies: 11
Views: 102

Re: What is a good source for larger cranks and sets

for a road bike I'd built my son, I put a Ultegra 53-39 with 175mm cranks. not sure I've ever seen any larger than 175's, too long of a crank will slow down how fast you can spin, and you get more power from spinning fast than from strength, plus your knees will appreciate it when you get older. and...
by LeftCoastNurd
Oct 18 2020 4:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

I think using a luggage scale is safer and easier, I used just a super cheap mechanical spring scale from a hardware store. I hanged the scale from a chin-up bar above the bike, with a rope that I could also pull down. The hook of the scale goes to pedal, and keeping the crank horizontal with my fo...
by LeftCoastNurd
Oct 17 2020 4:36pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

Newton-meters is the SI/metric unit of force, while ft-lbs (properly lbf-ft) is the 'imperial' unit. 1 lbf-ft is about 1.35 N-m. re: using dumbell/exercise weights, I think the thing to do would be to hang them off the pedal rather than try and put them on top of the pedal. My general plan that I'm ...
by LeftCoastNurd
Oct 17 2020 3:09pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

Retro-fitting any 3rd party motor is going to require some serious skills and imagination. I'd imagine you could scavenge the end plate off your baked TSDZ motor, and mount the replacement motor on the same plate... of course you'd need a compatible pinion gear and shaft fit onto the replacement mo...
by LeftCoastNurd
Oct 16 2020 11:32pm
Forum: E-Bike General Discussion
Topic: Help me Electrify it!!
Replies: 19
Views: 500

Re: Help me Electrify it!!

for really big long range cargo bikes, does anyone use LiFePO4? its not got the same energy/weight density as LiIon such as LiPoly, but they are much safer, and far less inclined to explode at high power levels, and you can get 100AH or larger single cells, so you'd just use 13S1P or whatever for a ...
by LeftCoastNurd
Oct 16 2020 10:01pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

gain /should/ be on some sort of logarithmic scale, as you want small steps at the low end and bigger steps at the high end. too many naïve programmers implement linear gain steps (for instance 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%), if you do this with volume, brightness, or most any ot...
by LeftCoastNurd
Oct 16 2020 9:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

I'm looking at the doc page on the Assist level table, and noting the default 20 assist levels went up to 1.50, which if I'm reading correctly, represents 1.50 * human_Watts == amps, 1.5 * 100 watts is 150 amps?!? while I haven't yet calibrated my torque, its telling me that if I'm outputting 100 wa...
by LeftCoastNurd
Oct 16 2020 3:13pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

so we need to find a higher temp rated motor in the same form factor, eh? I gather these are three phase brushless motors, with some sort of 3 phase speed encoder (guessing based on the 3 power wires and 3 signal wires I see in the pictures)
by LeftCoastNurd
Oct 16 2020 2:55am
Forum: E-Bike General Discussion
Topic: Help me Electrify it!!
Replies: 19
Views: 500

Re: Help me Electrify it!!

overnight trips without a recharge will be an issue with anything electric, unless the rides to and from are short

a 48V 20AH battery is 960 watt hours. if you average 300 watts riding that heavy rig, thats about 3 hours total riding time before needing a serious recharge.
by LeftCoastNurd
Oct 15 2020 12:24pm
Forum: E-Bike Technical
Topic: Should I buy a non functioning ebike?
Replies: 11
Views: 287

Re: Should I buy a non functioning ebike?

re punishment, I've got a 9 lb "Shark" battery on my bike, 52V 14AH (14S4P, 728 Watt*hour), mounted using one frame water bottle captive nut, and one 'bottlebob',and its quite rock solid, i've been over gravel, hopped curbs, and so forth, and its been quite solid. not a single rattle, and I am runni...
by LeftCoastNurd
Oct 14 2020 12:36am
Forum: E-Bike Technical
Topic: Should I buy a non functioning ebike?
Replies: 11
Views: 287

Re: Should I buy a non functioning ebike?

indeed. I could have bought a Specialized Vado, or something, but I chose to take the hybrid 'city bike' I'd built up a few years back and e-power it with a TSDZ2 and 52V 14AH 'Shark' battery. its a ripping fast urban bike. there is no throttle, it is pure pedal-to-go, pedal harder to go faster. if ...
by LeftCoastNurd
Oct 13 2020 10:22pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

sigh, thats really weak spot of this system. its HUGE fun to ride until it gets too hot. I've gone like 15 miles now on short test rides including a fair number of hills, and my battery is still at like 86% I want to run it down to like 50%, then plug its charger into a smart socket, and measure how...
by LeftCoastNurd
Oct 13 2020 5:28pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

How was the max temp of 85C/185F determined? my motor reaches that rather quickly on a 27C/80F ambient kind of day like today wehn I'm climbing hills and such. I did some poking around, and it seems like a lot of DC perm magnet motors are rated to operate at temps nearly twice that hot, like 150C
by LeftCoastNurd
Oct 13 2020 4:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: handlebar controls and shifters and brakes
Replies: 4
Views: 832

Re: handlebar controls and shifters and brakes

resurrecting this old thread, i just built my ebike version 3 out of my 700c hybrid. went with 8 speed rear, single speed front, and used a trigger shifter, with no ebike throttle, since the TSDZ2 is so natural feeling when riding, especially with the open source firmware... so these are my current ...
by LeftCoastNurd
Oct 13 2020 2:11pm
Forum: E-Bike General Discussion
Topic: A new 700C hybrid 'city-bike' build w TSDZ2
Replies: 24
Views: 762

Re: A new 700C hybrid 'city-bike' build w TSDZ2

While I never used to put kickstands on my bikes, I liked having one on this hybrid, when I wanted to park it where there was nothing to lean it on, and didn't want to lay it on the ground. on my wife's ebike hub drive conversion, I used a double sided kickstand which worked quite well due to the we...
by LeftCoastNurd
Oct 13 2020 1:15am
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

many bicycle riders never exceed a cadence of 60 rpm... does that mean they are not 'cyclists' ? we're not all Lance Armstrong (but my TSDZ2 sure makes me feel like I have Lance helping when climbing an 8% grade in medium gear!!)
by LeftCoastNurd
Oct 13 2020 12:55am
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

I don't have any experience riding with the commercial middrives, such as the Bosch, Yamaha, etc systems as used by the big bike maker's like Specialized, Giant, Trek... how do these behave at higher cadences ? I haven't a clue. But I never spun off the top of my BBS02 when I had it. I reckon a tor...
by LeftCoastNurd
Oct 12 2020 11:36pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

i've installed one 48V TSDZ2 with stock firmware, and indeed, it peters out above about 70 cadence, and completely drops all boost at 90. So... not for cyclists, I guess. That's not surprising for an outfit that would go into production with a fatally flawed mechanical design that looks like a quiz...
by LeftCoastNurd
Oct 12 2020 7:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

i've installed one 48V TSDZ2 with stock firmware, and indeed, it peters out above about 70 cadence, and completely drops all boost at 90. I've installed a second 48V (running with a 52V battery) with the open source firmware, and I can pedal 100-120 cadence and still have boost. thats about as fast ...
by LeftCoastNurd
Oct 11 2020 11:17pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7982
Views: 847879

Re: New "TSDZ2 Torque Sensor Central Motor"

huh, reading the procedure on calibrating the torque sensors... ok, I'm 220 lbs, I can stand on the pedal. I have no idea how to put, say, 100 lbs on the pedal... a 5 gallon bucket of water is only 40 lbs. plus I'm pretty sure my work stand will get very cranky (pun intended) if I add 100 lbs to the...
by LeftCoastNurd
Oct 11 2020 5:59pm
Forum: E-Bike General Discussion
Topic: A new 700C hybrid 'city-bike' build w TSDZ2
Replies: 24
Views: 762

Re: A new 700C hybrid 'city-bike' build w TSDZ2

Quite right. I guess the other factor will be how much clearance there is between the dished 42 you have now and the chain stay, and if you go bigger and dished is there enough clearance? miles of aisles for a bigger chain ring, like ridiculous amounts. https://photos.smugmug.com/Misc/Hybrid-eBike-...
by LeftCoastNurd
Oct 11 2020 3:54pm
Forum: E-Bike General Discussion
Topic: A new 700C hybrid 'city-bike' build w TSDZ2
Replies: 24
Views: 762

Re: A new 700C hybrid 'city-bike' build w TSDZ2

and I just mounted the Vittoria Adventure 700x40's, easily clear the frame. phew, what a loose fitting tire (having struggled in the past with Conti Gators on skinny rims), the old Vittoria x32 Randonneur Hyper's just about fell off, didn't need any tire irons at all, and it took special care to get...
by LeftCoastNurd
Oct 11 2020 12:40am
Forum: E-Bike General Discussion
Topic: A new 700C hybrid 'city-bike' build w TSDZ2
Replies: 24
Views: 762

Re: A new 700C hybrid 'city-bike' build w TSDZ2

oh hey, anyone know offhand what size metric bolt goes through the hole in a fork crown thats used for caliber/sidepull kinda brakes? I need to get a mounting bolt for my headlight kit, the fork has the hole there but uses V-brakes so its empty...
by LeftCoastNurd
Oct 11 2020 12:31am
Forum: E-Bike General Discussion
Topic: A new 700C hybrid 'city-bike' build w TSDZ2
Replies: 24
Views: 762

Re: A new 700C hybrid 'city-bike' build w TSDZ2

pretty sure there's good clearance. this is a 700C alum frame, set up for at most 40mm tires. the chain stays are rather flattened ovals too, so they don't bulge out much. its late at night or I'd go eyeball it right now... btw, heh, I weighed the bike as is this afternoon... my fish scale says its ...
by LeftCoastNurd
Oct 10 2020 4:02am
Forum: E-Bike General Discussion
Topic: A new 700C hybrid 'city-bike' build w TSDZ2
Replies: 24
Views: 762

Re: A new 700C hybrid 'city-bike' build w TSDZ2

so I guess next up on my menu is new tires. I have a fresh pair of 700x38 Vittoria Adventure Tech to replace the 8 year old Vittoria Randoneur Hyper 700x32. I need to clean the brake rims too, and what better time than when the tires are off? trouble is, those Hypers ride really really nice, they ar...