Search found 393 matches

by ferret
Jan 07 2019 10:11am
Forum: E-Bike Non-hub Motor Drives
Topic: DH frames for freeriding
Replies: 36
Views: 717

Re: DH frames for freeriding

Grant, a 200mm travel DH bike is a good choice, the slack head angle good for riding fast off road. In most cases, freeriders use DH bikes. That said, any (decent quality) full suspension bike will be a major step up compared to a HT. you should take into account that generally the more travel a bik...
by ferret
Aug 31 2018 3:15pm
Forum: E-Bike General Discussion
Topic: Mountain bike frame geometry tending to get longer and lonnnger
Replies: 18
Views: 626

Re: Mountain bike frame geometry tending to get longer and lonnnger

Chalo wrote:
Aug 31 2018 12:47pm
Since MTB riding is usually only fooling around of one kind or another, even what kind of riding that is, is an expression of fashion.
:shock:
:roll:
:lol:
by ferret
Aug 29 2018 3:02am
Forum: E-Bike Technical
Topic: Kv * turns = constant?
Replies: 10
Views: 452

Re: Kv * turns = constant?

Short answer - no. When you double the the KV you also get half the KT and get half of the torque for the same current. However, when doubling the reduction ratio you will get only half the heat.

Long answer - read this :twisted: :
viewtopic.php?f=2&t=64907

Avner.
by ferret
Aug 13 2018 5:58am
Forum: E-Bike Technical
Topic: Possible to increase charger current.
Replies: 5
Views: 249

Re: Possible to increase charger current.

The chargers markings seem to suggest it is rated at 360 Watt. If that is the case, then it won't charge at 8A if the pack voltage is higher than 45V.

Avner.
by ferret
Jul 31 2018 10:09am
Forum: E-Bike Technical
Topic: Lower no-load speed with sine wave controller?
Replies: 11
Views: 367

Re: Lower no-load speed with sine wave controller?

Thanks a lot for the reply! So the Sabvoton probably uses a simpler technique. Are there any controllers that use a more sophisticated technique? (Adaptto?) Which of them use space vector modulation? Instead of replacing the controller, why not just just enable the field weakening and set it to get...
by ferret
Jul 30 2018 5:54pm
Forum: E-Bike Non-hub Motor Drives
Topic: Nylon Motor Mounts
Replies: 5
Views: 259

Re: Nylon Motor Mounts

I guess thick plastic could work, but why not use Aluminium? Also, why mount it in a tubular structure instead of bolting the original mounting points to brackets on the swing arm? Maybe if you posted some picture I could get a batter idea of what you are aiming for and try to give more focused advi...
by ferret
Jul 30 2018 5:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: Castle LINK programming kit - is it necessary/worthwhile with CA V3?
Replies: 11
Views: 393

Re: Castle LINK programming kit - is it necessary/worthwhile with CA V3?

I'm running a Phaserunner with a 3215 (sensored).
Works good, but less powerful than the HV160 I used before.

Dave, the ASI guys are useless, Grin Cycles guys rock.

To get it to work without errors I used the following setting:
Banwidth.PNG
Avner.
by ferret
Jul 30 2018 11:34am
Forum: E-Bike Non-hub Motor Drives
Topic: Nylon Motor Mounts
Replies: 5
Views: 259

Re: Nylon Motor Mounts

Ham,
Nylon isn't very strong and is a poor heat conductor.
Mounting the motor in a tubular closed structure with heat insulating mounts sounds like a recipe for heat soak.
Doesn't make much sense to me...

Avner.
by ferret
Jul 30 2018 4:30am
Forum: E-Bike Technical
Topic: BMX chains
Replies: 5
Views: 229

Re: BMX chains

Only 10 (or more) speed chains will fit 10 speed cassettes and derailleurs. BMX chains are too wide.

Avner.
by ferret
Jul 24 2018 5:06am
Forum: E-Bike Non-hub Motor Drives
Topic: Name/Type of sprocket for this mid motor drive?
Replies: 8
Views: 407

Re: Name/Type of sprocket for this mid motor drive?

Maybe turn the old sprocket into an adaptor for a standard BCD sprocket by drilling chainring bolt holes and cutting off the the toothed rim?

Avner.
by ferret
Jul 07 2018 9:01am
Forum: E-Bike Technical
Topic: Halo wheels
Replies: 2
Views: 180

Re: -- Cuts in Halo wheels, what the heck is this? --

Looks normal. All aluminum rims are made by taking a straight profiled extrusion and bending it into a circle. The "cuts" are the place where the circle is joined. The joint is usually strengthened with an insert and some times welded. In most cases the valve hole is located opposite to the joint of...
by ferret
Jul 04 2018 8:31am
Forum: E-Bike Technical
Topic: Powerful middrive in a carbon frame
Replies: 24
Views: 1485

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: 679

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 418 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: 217

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: 413

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: 3650

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: 1251

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 163 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: 1354
Views: 152990

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: 1189

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: 264

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: 659

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: 659

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: 292

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: 800

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: 143
Views: 46996

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...