Search found 551 matches

by Overclocker
May 23 2019 10:38pm
Forum: E-Bike Technical
Topic: 17" moped rim vs 19" moped rim???
Replies: 2
Views: 73

Re: 17" moped rim vs 19" moped rim???

https://i.imgur.com/BByC42p.jpg bigger has its advantages: bigger contact patch, better on square-edged hits, etc. but also weighs more. sometimes smaller is needed to get your desired "gearing". smaller wheel particularly advantageous w/ hubmotors this bike has 17" moto rear and 26" bicycle front....
by Overclocker
May 10 2019 3:53am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Denzel D9000 motor any thoughts?
Replies: 1
Views: 134

Denzel D9000 motor any thoughts?

Image

http://www.eastgem.net/d9000.html

seems to be simply a slightly longer version of the D7500 i.e. same diameter but D9000 is 170mm long, D7500 is 127mm

any thoughts?
by Overclocker
May 04 2019 9:43am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Denzel 72v 4-spd Gearbox Build DB17
Replies: 48
Views: 1909

Re: Denzel 72v 4-spd Gearbox Build DB17

very nice project! i need exactly that: low-range gears that could get me through super loose sand and up super steep terrain while keeping power draw low

btw i noticed your industrial chain. mine are doing well so far. i think these industrial chains have harder metallurgy than (cheap) moto chains
by Overclocker
May 04 2019 12:28am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 139
Views: 18499

Re: New build, BHT mid-drive "direct", custom frame

I've found the same conclusion. I use 180mm on rear wheel since is enough to lock up, 203 in front. Up to now my prefered brakes are the Shimano Zee. https://www.chainreactioncycles.com/shimano-zee-m640-disc-brake/rp-prod82434 , quad piston designed for downhill, amazing modulation. Those 203 rotor...
by Overclocker
Apr 29 2019 2:54am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 3605
Views: 241728

Re: Sur-Ron - New Mid drive Bike

What is the best 26 inch coil fork for this bike? It seems like we are stuck getting air forks, if we want to buy new. The only coil forks are for 27.5 and 29 inch bikes. Seems like most people prefer coil if not for the weight in the biking world. Ask your self this if your sur ron fork broke tomo...
by Overclocker
Apr 29 2019 2:12am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 139
Views: 18499

Re: New build, BHT mid-drive "direct", custom frame

#41 running great so far...

Image


the 220mm shock w/ 550lb spring was too soft so i purchased a 240mm w/ 650lb spring. will test it soon

Image
by Overclocker
Apr 28 2019 2:46am
Forum: E-Bike Non-hub Motor Drives
Topic: Chains and sprockets, info and index
Replies: 15
Views: 21237

Re: Chains and sprockets, info and index

i went ahead and got 4 boxes of #41 chain (10ft/bx). we'll see how fast it wears out... https://i.imgur.com/5qH3Lrr.jpg https://i.imgur.com/PzNpJK1.jpg https://i.imgur.com/R52zGES.jpg https://i.imgur.com/WmBj3sK.jpg i'm also cross-posting these side-by-side pics of these various size chains because ...
by Overclocker
Apr 28 2019 12:48am
Forum: E-Bike Non-hub Motor Drives
Topic: Electric free ride build from scratch
Replies: 45
Views: 1756

Re: Electric free ride build from scratch

http://i.imgur.com/Fk0qecO.png i used this calculator but i ended up having an actual speed of about 50kph (or 55kph using this controller's "overspeed" mode). so use a value of about 80% in the "percentage of speed when loaded" for more realistic results. get a cheap laser tach very useful. use as...
by Overclocker
Apr 27 2019 11:07pm
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 139
Views: 18499

Re: New build, BHT mid-drive "direct", custom frame

i just got 4 boxes of #41 chain (10ft/bx). interestingly #41 uses the exact same size sprockets as #420. much lighter weight. slightly smaller pins. we'll see how fast it wears out... https://i.imgur.com/5qH3Lrr.jpg https://i.imgur.com/PzNpJK1.jpg https://i.imgur.com/R52zGES.jpg https://i.imgur.com/...
by Overclocker
Apr 23 2019 1:53am
Forum: E-Bike Non-hub Motor Drives
Topic: Electric free ride build from scratch
Replies: 45
Views: 1756

Re: Electric free ride build from scratch

Bonneville wrote:
Apr 22 2019 12:23pm
Any one knows what the kV is for a Denzel 4500 ?

probably 60?

have you decided on your chain/sprocket size? i'm using #420 btw...
by Overclocker
Apr 23 2019 1:50am
Forum: E-Bike Non-hub Motor Drives
Topic: Chains and sprockets, info and index
Replies: 15
Views: 21237

Re: Chains and sprockets, info and index

https://i.imgur.com/cecYiDu.jpg i'm currently using cheap counterfeit 420 chains which don't last very long in the terrain i ride in (sandy dusty, muddy, river crossing, etc). i'm thinking of trying this KANA #41 industrial chain. #41 uses the same sprockets as #420 but has slightly smaller pins. b...
by Overclocker
Apr 11 2019 6:34am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 139
Views: 18499

Re: New build, BHT mid-drive "direct", custom frame

thanks skeetab! https://i.imgur.com/lrrLJS4.jpg https://i.imgur.com/PsNVopc.png just got a budget quad piston for the front only. the rear tire is already easy to lockup working great so far. i also got these 203mm rotors. thicker and heavier than shimano RT-66 that i replaced. 250g each. seems to b...
by Overclocker
Apr 11 2019 6:07am
Forum: Large EV General Discussion
Topic: Suzuki kei truck at 50kph flat ground
Replies: 10
Views: 400

Re: Suzuki kei truck at 50kph flat ground

thanks chalo very helpful :roll: https://www.diyelectriccar.com/forums/showthread.php?t=15508 i found this formula: The POWER requirements of your car at a particular speed is: Power in Watts = ((Mass in kg) (9.8m/s²) (Velocity in m/s) (Rolling Resistance)) + ((0.6465) (Coefficient of Drag) (Area in...
by Overclocker
Apr 11 2019 12:46am
Forum: Large EV General Discussion
Topic: Suzuki kei truck at 50kph flat ground
Replies: 10
Views: 400

Re: Suzuki kei truck at 50kph flat ground

Why the smallest motor? Why not the most dependable, most efficient, or most cost effective? You're already opting for 700kg of relatively useless pig iron, after all. If you want to use the smallest motor, figure out the power requirement at 50kph and use an RC airplane motor that delivers that mu...
by Overclocker
Apr 11 2019 12:36am
Forum: Large EV General Discussion
Topic: Suzuki kei truck at 50kph flat ground
Replies: 10
Views: 400

Suzuki kei truck at 50kph flat ground

Image

660cc engine (to be removed)

700kg (ish) curb weight

i just need it to cruise at 50kph on flat roads. what's the smallest motor that could do this? a golden motor 5000w watercooled would do it?
by Overclocker
Apr 10 2019 11:50pm
Forum: E-Bike Non-hub Motor Drives
Topic: Electric free ride build from scratch
Replies: 45
Views: 1756

Re: Electric free ride build from scratch

yeah it climbs pretty much everything around here. btw i'm also planning on using a smaller motor sprocket to sacrifice top speed for more torque. since you ordered a Kelly just start conservatively then start upping the amps if you see that the motor isn't getting hot as for the cells since you'll ...
by Overclocker
Apr 10 2019 3:57am
Forum: E-Bike Non-hub Motor Drives
Topic: Electric free ride build from scratch
Replies: 45
Views: 1756

Re: Electric free ride build from scratch

https://secondlifestorage.com/repackr.php this tool should help you group your cells to have the least capacity differences across parallel groups denzel d4500 is a 5kg motor, in the same class as my BHT. i got a thermal sensor directly on the windings and i'm getting up to 90C in difficult terrain....
by Overclocker
Apr 07 2019 9:55pm
Forum: Large EV General Discussion
Topic: Tata Nano, two small motors on a single shaft
Replies: 1
Views: 268

Tata Nano, two small motors on a single shaft

ETxw6cO6-k8 this guy put two small motors, kinda like the BHT i'm using or probably slightly bigger, on a single shaft to drive the "world's cheapest car" (600-ish kg curb weight WITH engine which he removed) would probably overheat the motors, right? also aren't there synchronization or load shari...
by Overclocker
Apr 04 2019 2:45am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 139
Views: 18499

Re: New build, BHT mid-drive "direct", custom frame

trazor and madin888, it was a race but nothing serious, was just for fun. slow twisty track so i didn't even put on all my gear, coz i'm not an all-the-gear all-the-time person :lol: but thanks for the links trazor! when out trail riding i put on elbow, knee/shin, gloves, and hiking boots. PS here's...
by Overclocker
Apr 02 2019 7:03am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 139
Views: 18499

Re: New build, BHT mid-drive "direct", custom frame

if you use by rated power my motor give to you zero problem ;) my new motor builded in unitemotor factory and cant say is bad quality nothing to do w/ rated power. the yellow phase wire wasn't properly tied in so it ended up touching the rotor. a quality control issue anyway i just got back from an...
by Overclocker
Mar 25 2019 2:28am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 139
Views: 18499

Re: New build, BHT mid-drive "direct", custom frame

https://i.imgur.com/jm4nAvT.jpg still need to tidy up the wiring. then add yellow and red graphics to the battery box to match the color scheme of the fork. etc https://i.imgur.com/hiwZmcM.jpg then i found this lightweight 17" rim. so together w/ 12-gauge spokes should reduce weight as well as be a...
by Overclocker
Mar 19 2019 6:00am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 139
Views: 18499

Re: New build, BHT mid-drive "direct", custom frame

madin88 wrote:
Mar 18 2019 8:35am
Did you paint the frame or is it powdercoat? Looks nice :thumb:
rattle can :lol: