Search found 13 matches

by JohnH
Jun 17 2012 12:00pm
Forum: EBike General Discussion
Topic: Want to go SINGLESPEED what do i need?
Replies: 5
Views: 637

Re: Want to go SINGLESPEED what do i need?

"It Depends". Sorry, but it does. Many 7-speeds are a simple freewheel - the thing is a unit, and the ratcheting mechanism is part of the cogset rather than part of the hub. There are IIRC some 7-speed cassettes around, and they would use something like what you posted. The common 7-speed ...
by JohnH
Dec 15 2010 8:00pm
Forum: EBike Non-hub Motor Drives
Topic: gears, why not use an old bikes derailleur shifter mechanism
Replies: 12
Views: 2038

Re: gears, why not use an old bikes derailleur shifter mecha

I think you will tear the tyre apart quite quickly with the cone type fricton drive. As it pushes down into the tyre for grip the contact patch widens, this area sees different speeds across the cone. That makes sense to me. The larger-diameter part of the cone has a higher speed in SFM (Surface Fe...
by JohnH
Nov 23 2010 12:28pm
Forum: EBike Technical
Topic: 2WD Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"
Replies: 1132
Views: 236865

Re: Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"

More amps, so more heat generated from resistance, so more power lost to heat? That's what I understand the "more volts and gear it down" guys to be saying. I'm assuming that your motor is running the same actual RPM either way, to drive the bike at the same speed, so rpm "sweet spot&...
by JohnH
Sep 28 2010 2:16pm
Forum: EBike Non-hub Motor Drives
Topic: Amberwolf's other "Bottom Bracket"-type Drivetrain Idea
Replies: 30
Views: 3420

Top-of-the-Chain (Drive-side) Drives

I'm usually quiet here, because while I'm comfy building up a bike from components, I've yet to build anything at all e-bike-like. However, I've done a lot of reading and absorbing, here and elsewhere on these topics, and picked up on a few things. So all this is my interpretation of other folks' id...
by JohnH
Jan 08 2010 3:33pm
Forum: EBike Technical
Topic: 2WD Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"
Replies: 1132
Views: 236865

Re: Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"

First let me say: your ability to fabricate and adapt really amazes me. I read the full post on your linked blog, and I do have one observation that may be of some use to you. I own a recumbent bike that uses a mid-drive, and on it (and others I know of) two chains are never allowed to occupy adjace...
by JohnH
Jan 04 2010 5:46pm
Forum: EBike Non-hub Motor Drives
Topic: D's RC Drive Kona DC1
Replies: 1170
Views: 124587

Re: D's RC Drive Kona DC1

FWIW: Shorter cranks make higher cadences easier - it's not so much the RPM per se, as it is "foot speed". You can only move your feet so quickly - so if you reduce the crank length, you reduce the circumference, you reduce the speed your feet are moving to make a given cadence. I run 142m...
by JohnH
Dec 23 2009 5:35pm
Forum: EBike Non-hub Motor Drives
Topic: Cyclone 500W kit build
Replies: 11
Views: 2433

Re: Cyclone 500W kit build

That should be an 8mm hex bolt. You can get self-extractors which will still have the 8mm bolt, but a threaded ring wraps around it so that when you unscrew the bolt the arm is forced off the crank taper. I have those on one bike. Otherwise the crank extractor tool is pretty cheap, sounds like you a...
by JohnH
Dec 22 2009 9:18pm
Forum: EBike Non-hub Motor Drives
Topic: Mounting TWO freewheels on one rear wheel hub
Replies: 41
Views: 18683

Re: Mounting TWO freewheels on one rear wheel hub

Mike: First of all, I'm fascinated by your series-hybrid build - I've thought of doing something similar since first reading about a design study done in Europe (Germany?), perhaps a couple years ago. Sadly, I lack the skills to even begin with sourcing the dynamo, let alone building the regulator. ...
by JohnH
Dec 22 2009 6:32pm
Forum: EBike Non-hub Motor Drives
Topic: Mounting TWO freewheels on one rear wheel hub
Replies: 41
Views: 18683

Re: Mounting TWO freewheels on one rear wheel hub

Re: Mounting TWO freewheels on one rear wheel hub by mwkeefer » Tue Dec 22, 2009 2:07 am John, This is awesome... very cool for those wishing single speed pedal and motorized... I've been looking around at the available thread on freewheels... it seems 13t is the smallest (not quite 11 but it will...
by JohnH
Dec 22 2009 12:42am
Forum: EBike Non-hub Motor Drives
Topic: Mounting TWO freewheels on one rear wheel hub
Replies: 41
Views: 18683

Re: Mounting TWO freewheels on one rear wheel hub

now this has me wondering what its made out of and who did the broaching. http://www.niagaracycle.com/product_inf ... 7a2ed95c3a The main assembly will be made of aluminum - the cog itself will be steel. What you have there is a way to turn a more recent/expensive freehub into a single-speed withou...
by JohnH
Nov 02 2009 1:39pm
Forum: EBike Non-hub Motor Drives
Topic: Pedal cadence and motor speed
Replies: 8
Views: 911

Re: Pedal cadence and motor speed

Here's perhaps the definitive gear calculator - easy to use, already knows about DualDrive and mony common (and uncommon) cassettes, etc.

http://www.sheldonbrown.com/gears/

Hope this helps,

John
by JohnH
Jan 19 2009 5:50pm
Forum: EBike Non-hub Motor Drives
Topic: 1hp scott motor ebike
Replies: 27
Views: 6556

Re: 1hp scott motor ebike

I'm setting it up stationary with three 7ah sla's and the YK42 and using the brake as a resistance load to simulate going up a hill (its pittsburgh we have lots of hills) once I increase the speed to about just over 1/2 it throws the chain How's the chain line? I can't really tell from the pic, but...
by JohnH
Nov 30 2008 7:10pm
Forum: EBike Non-hub Motor Drives
Topic: Classification of drive types
Replies: 44
Views: 6059

Re: Classification of drive types

Hi, I've just been lurking for a while, but language and naming is a topic that always gets me going, I like safe's latest pretty well. How about, in order: Motor First Series Drive Single Chain Drive Parallel Drive (could be any combination of chain/belt) Crank First Series Drive (the crank is the ...