Search found 432 matches

by ferret
Jul 04 2018 8:31am
Forum: E-Bike Technical
Topic: Powerful middrive in a carbon frame
Replies: 28
Views: 2806

Re: Powerful middrive in a carbon frame

How would you mount it - 2 piece brackets that go around the frame and tighten or screw through the frame? Any feedback is welcome, I'm currently deciding between an alloy and carbon stumpjumper, and 2-3kg weight saving on an ebike would be quite appreciated, I just don't want to snap it in half. H...
by ferret
Jun 30 2018 6:02am
Forum: E-Bike General Discussion
Topic: Rear hub that can hold a sprocket as well as the Disc Rotor ?
Replies: 6
Views: 1596

Re: Rear hub that can hold a sprocket as well as the Disc Rotor ?

Most builds use an adapter beneath the brake disk to bolt the sprocket to instead of using a special hub.

Such as this:
5 holes chainwheel adaptor for BCD 44mm Disc brake mount 18 USD:
http://www.cyclone-tw.com/Parts.html

or this:
20160627_102842_HDR.jpg
20160627_102842_HDR.jpg (304.62 KiB) Viewed 1335 times
Avner.
by ferret
Jun 30 2018 5:51am
Forum: E-Bike Technical
Topic: Building a robust rear wheel for a mid-drive
Replies: 2
Views: 390

Re: Building a robust rear wheel for a mid-drive

With the high torque forces applied with some of the more powerful mid-drive kits, building a proper rear wheel to handle the stress seems quite important. ... Reading through Sheldon Brown's excellent site and info, he mentions that some builders opt to use stronger spokes on the drive/derailleur ...
by ferret
Jun 29 2018 11:17am
Forum: E-Bike Non-hub Motor Drives
Topic: crank freewheel dimensions?
Replies: 8
Views: 989

Re: crank freewheel dimensions?

X2flier ,
I think something in here will do the job for you:

http://www.cyclone-tw.com/Parts.html

Get a BB to fit your frame with the matching crank threaded arms.
Avner.
by ferret
Jun 24 2018 8:26am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5610

Re: Using bicycle's frame as heatsink for the Phaserunner

Remember that liquid water takes a HUGE amount of energy to evaporate. This is why sweating is so effective. ... I agree that the best approach would have been replacing the controller to a bigger 12FET one, but you tell me where to find a 12FET controller which is: 1. Programmable (in the sense of...
by ferret
Jun 19 2018 3:05pm
Forum: E-Bike Technical
Topic: Short throw thumb throttle?
Replies: 28
Views: 2060

Re: Short throw thumb throttle?

Using the WUXING 108X (on the left side).
After running it stock for some time, I shortened the lever with a grinder to get less linear throw and more sensitivity.
IMG_20180619_225832_800.jpg
IMG_20180619_225832_800.jpg (88.82 KiB) Viewed 358 times
Happy with it.

Avner.
by ferret
Jun 19 2018 2:51pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 1424
Views: 216312

Re: Dave's 80:1 RC mid drive kit build log

Hello everybody! I have some difficulty with the half throttle provided witht the tangent. I'm looking for a thumb accelerator, but I'm not sure to have enough space on my right side because of the shifter, maybe I should to install it on the left side. Do you have any feedback with this type of th...
by ferret
Jun 03 2018 8:00am
Forum: E-Bike General Discussion
Topic: "We don't service DIY Ebikes" said the cycle shop
Replies: 26
Views: 2072

Re: "We don't service DIY Ebikes" said the cycle shop

Bleeding the brakes is within the capabilities of a A good DIYer, I bleed my own 8) .
Maybe you could remove the brakes from the bike and give just the brakes to the bike shop?

Avner.
by ferret
Jun 03 2018 7:54am
Forum: E-Bike Technical
Topic: random cogging issues
Replies: 4
Views: 440

Re: random cogging issues

Hello Clinton.

You can check the throttle and its wiring.
That said, when running sensorless I did encounter some cogging.

Avner.
by ferret
May 21 2018 9:39am
Forum: E-Bike General Discussion
Topic: Which hole size for tap?
Replies: 15
Views: 1064

Re: Which hole size for tap?

It is common practice to send the machine shop a drawing of the part which will have important dimensions marked appropriately even when the part will be manufactured by a CNC program based on a 3D model. M6 pitch is 1 mm. This is the thread used in mountain bikes (and practically everywhere else). ...
by ferret
May 21 2018 7:31am
Forum: E-Bike General Discussion
Topic: Which hole size for tap?
Replies: 15
Views: 1064

Re: Which hole size for tap?

Hey Guys, I want to send a 3d model to CNC and I need to have an M5 and M8 threads but in the model I don't design the threads but only the holes so I wanted to know what is the diameter I need to make the holes for M8 and M5. Hi rg12. 1. If you are having the part made by a machine shop than you s...
by ferret
Apr 29 2018 4:14am
Forum: E-Bike General Discussion
Topic: Coiled power cable?
Replies: 5
Views: 538

Re: Coiled power cable?

Hi. I couldn't find a coiled cable either. I'm using 10 AWG wires coming out of the backpack, wrapping around to the front and looped through the backpack's belt buckle. The cable connects to a plug attached to the bike's top tube. I used 2 zip ties to attach a piece of elastic rubber to the wires. ...
by ferret
Apr 08 2018 4:39am
Forum: E-Bike Non-hub Motor Drives
Topic: Tangent 6kw fat bike components
Replies: 8
Views: 1238

Re: Tangent 6kw fat bike components

fullofdays wrote:
Apr 01 2018 8:48pm

What size brakes will work best?
I'd go with 203mm rotors, front and back.
Larger is overkill and would require a custom setup.
No real reason to go smaller, unless 203mm unapproved for the frame or fork by the manufacturer.

Avner.
by ferret
Mar 24 2018 3:30pm
Forum: E-Bike Technical
Topic: EBike Toolbox - Bargains! $
Replies: 146
Views: 60297

Re: EBike Toolbox - Bargains! $

The common SS alloys; 304, 316 etc. are "non magnetic" and are very good for corrosion resistance. However they are usually inferior in terms of mechanical strength to common steel alloys. There are SS alloys which have excellent mechanical strength, 17-4 PH for example, that show a weak magnetic re...
by ferret
Jan 29 2018 5:14am
Forum: Battery Technology
Topic: Battery amp Vs phase amp?
Replies: 28
Views: 4928

Re: battery / phase current ratio unanswered

Hi esust. I'm no electronics expert so this is not an accurate answer. From what I read, the controller and motor windings act like a buck converter (similar to a transformer) which causes the motor to get higher current at a lower voltage. The power (voltage X current) stay the same because of ener...
by ferret
Jan 08 2018 9:38am
Forum: E-Bike Non-hub Motor Drives
Topic: Fitting freewheels to splined freehub drivers
Replies: 639
Views: 71516

Re: Fitting freewheels to splined freehub drivers

Thud,
https://www.tartybikes.co.uk/complete_f ... s/c16.html

The shop offers several types of splined freewheels and cranks. The Bonez and Crewkerz brands have Shimano compatible splines while the others (Crewkerz among them) are proprietary patterns.

Avner.
by ferret
Jan 08 2018 4:01am
Forum: E-Bike Non-hub Motor Drives
Topic: Fitting freewheels to splined freehub drivers
Replies: 639
Views: 71516

Re: Fitting freewheels to splined freehub drivers

Nice find DanGT86!
This used to be a unicorn and now it's an off the shelf part.

Avner.
by ferret
Jan 02 2018 4:32pm
Forum: E-Bike Technical
Topic: Short throw thumb throttle?
Replies: 28
Views: 2060

Re: Short throw thumb throttle?

Maybe combine a short "vertical" travel throttle with this product (or DIY somthing similar):

Image

http://www.wolftoothcomponents.com/products/remount

Avner.
by ferret
Jan 02 2018 12:40pm
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 1561

Re: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

Really you need to just try that individual motor and see how to does. It might double its useful RPM range only changing from 91% efficiency to 90% efficiency while it's at double speed. It might drop from 90% the 80%, but I've never seen any amount of 'field weakening' achieve a double digit effi...
by ferret
Jan 02 2018 11:33am
Forum: E-Bike Technical
Topic: Best Cushiony Rear Shock for Ebike
Replies: 16
Views: 1819

Re: Best Cushiony Rear Shock for Ebike

I have the following suggestions: A coil shock will have better small bump sensitivity then an air shock. A shock with more adjustments (high speed compression, low speed compression, high speed rebound and low speed rebound) will potentially be better, but reaching that potential will take more tri...
by ferret
Jan 01 2018 6:23am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 1561

Re: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

It only reaches the penalty of the % at that speed it achieves. So if your max field weakened no-load speed for your motor is 80mph or whatever, but you only have the power to achieve 50mph, you will never be penalized for what it would be doing at 80mph, because it only advances timing as much as ...
by ferret
Dec 30 2017 4:29am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 1561

Re: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

https://endless-sphere.com/forums/viewtopic.php?f=30&t=63467 Thanks for pointing out this thread, I will check it out. For every RC car and ebike and EV I personally would max field weakening settings (this is also what OEMs all do). I would have guessed that at some point too much timing/field wea...
by ferret
Dec 29 2017 9:22am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 1561

Re: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency

Thanks, my applications are RC inrunner motors, my Astroflight 3215 (sensored) powered bike and actual RC race cars. On the bike I can either use the Phaserunner's field weakening or increase cell count for more top end power and in the RC cars advance timing, change gearing use a lower wind motor. ...
by ferret
Dec 28 2017 10:46am
Forum: E-Bike Technical
Topic: Discussion: Motor voltage, timing and gearing's effects on performance and efficiency
Replies: 18
Views: 1561

Re: Higher top speed question for motor gurus

Dan, thanks for taking the time to write the detailed response. I guess I didn't title the topic correctly, because I'm not getting the type info I'm looking for. Something like a motor simulator that allows you the mess with the motor's timing. I'll try to steer the discussion to motor parameters' ...