2009 IZIP Express

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Jerome Daoust   100 W

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2009 IZIP Express

Post by Jerome Daoust » Dec 17 2008 1:37pm

Available in April 2009 for 2999 $US it seems to have decent energy (36 V and 18 Ah), power (750 W motor) and speed (20+ mph / 32+ km).

Related websites:
Currie Technologies
IZIP USA
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Express.jpg
General view

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Sacman   10 kW

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Re: 2009 IZIP Express

Post by Sacman » Dec 17 2008 3:51pm

Last I heard when this thing first came out was that they were having problems with the belt drive slipping on hills and other high torque conditions. I hope they finally got the problems worked out.

It IS supposed to be a pretty good hill climber tho. But yikes!!! that's a pretty costly $3000 ebike! :shock:

Jerome Daoust   100 W

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Belt drive

Post by Jerome Daoust » Dec 17 2008 4:34pm

Sacman wrote:Last I heard when this thing first came out was that they were having problems with the belt drive slipping on hills and other high torque conditions. I hope they finally got the problems worked out.
I blew up the picture around the belt drive and sharpened it...
That belt drive has teeth, so I cannot imagine it slipping.
Probably quieter than a chain drive, so it could be a good compromise for power transmission efficiency and being quiet.
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Belt_drive.jpg
Belt drive
Belt_drive.jpg (107.32 KiB) Viewed 6433 times

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Miles   100 GW

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Re: Belt drive

Post by Miles » Dec 17 2008 5:07pm

Jerome Daoust wrote: That belt drive has teeth, so I cannot imagine it slipping.
I can :)

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vanilla ice   100 MW

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Re: 2009 IZIP Express

Post by vanilla ice » Dec 17 2008 5:39pm

Nice but I'd rather have an ezip and $2750 to mod it.

Jerome Daoust   100 W

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More info

Post by Jerome Daoust » Dec 18 2008 1:59pm

Through a phone call to Currie (1-800-377-4532) I learned that...
  1. One can easily remove the 18 Ah battery, for example to transporting the bike on a bike rack. This is easily done with a quick release lever. Weight of the battery is about 18 lb, so the weight would be about 44 lb without the battery, instead of 62 lb with it.
    Yes, the battery pack is very easy to remove. Undo the QR, slide pack up and swing out to the left
  2. The bike can freewheel. So you can stop pedaling and keep coasting (maintain speed).
    The bike operates like a standard bicycle in that you can freewheel and spin the pedals backwards. Note that the motor will only engage when pedaling forward.
  3. It has a high-pitched whine sound but can be regarded as mostly silent. It will not draw attention from people because of the sound.
    When the motor is engaged the motor and belt produce a "whirring" sound. It is not lot but not silent.
  4. The basic warranty covers the bike for 365 days and battery for 90 days. The manufacturer does not provide an extended warranty plan, but maybe distributors can offer this.
    Unfortunately not, we do not offer an extended warranty for any of our products
  5. On the "battery gauge" there are 5 levels indicated by LED lights arranged in a crescent.
    The battery gauge has 5 lights to indicate battery charge level
  6. There is a side stand.
    Standard side kickstand just like other bicycles
  7. The motor to rear wheel drivetrain is probably at a fixed gear ratio.
    The motor-to-rear wheel pulley is a fixed ratio
  8. There is no anti-theft device (no key), just an on/off switch.
    The battery pack features a simply key lock to help prevent removal however there is no lock to prevent the bike from being turned on.
  9. The motor still assist the rider beyond 20 mph, it does not cut out at that speed. This way, riders can reach higher speeds by adding pedal assistance.
  10. You must pedal to move the bike. You decide the level of motor assistance, but you cannot run the bike on motor alone.
In Red: Updated answers on 2009/1/29 by James Pineda of IZIP-USA.
Last edited by Jerome Daoust on Jan 29 2009 8:56pm, edited 2 times in total.

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Miles   100 GW

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Re: More info

Post by Miles » Dec 18 2008 2:16pm

Jerome Daoust wrote: [*]The motor to rear wheel drivetrain is probably at a fixed gear ratio.
Jerome,

It has an epicyclic differential between the motor and the pedal drive - this enables the motor to remain at an 'efficient speed' as wheel speed varies.

Here's the patent: http://v3.espacenet.com/publicationDeta ... 5&KC=&FT=E

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vanilla ice   100 MW

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Re: 2009 IZIP Express

Post by vanilla ice » Dec 18 2008 2:55pm

Uh so its fixed right?

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Miles   100 GW

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Re: 2009 IZIP Express

Post by Miles » Dec 18 2008 3:00pm

vanilla ice wrote:Uh so its fixed right?
That depends what is meant by the rear wheel..... :P

My contribution was intended to amplify rather than contradict....

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vanilla ice   100 MW

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Re: 2009 IZIP Express

Post by vanilla ice » Dec 18 2008 3:10pm

Thats cool I'm just confused is all.. :)

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Miles   100 GW

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Re: 2009 IZIP Express

Post by Miles » Dec 18 2008 3:24pm

- The ratio between the motor and its input to the differential is fixed.

- The ratio between the pedals and their input to the differential can be varied by the derailleur gears.

- the sum outputted from the differential to the wheel hub is variable.

- Therefore the ratio between the motor and the part of the wheel that consists of hub, spokes, rim and tyre, is variable.

Any better? :)

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Re: 2009 IZIP Express

Post by Jerome Daoust » Dec 18 2008 4:28pm

Thanks Miles.

Looking at the schematic (attached) of the patent, we see the differential inside the hub.

I know the setup is such that power is provided only when pedal input is detected, but for the sake of the argument if one would backpedal as fast as the the motor attempts to turn the wheel, you would stay stationary. :lol:
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Schematic.jpg
Schematic of the patent

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Miles   100 GW

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Re: 2009 IZIP Express

Post by Miles » Dec 18 2008 4:34pm

Jerome Daoust wrote: I know the setup is such that power is provided only when pedal input is detected, but for the sake of the argument if one would backpedal as fast as the the motor attempts to turn the wheel, you would stay stationary. :lol:
:mrgreen: :lol:

It's a rather clever system. It's main drawback, for me, is that the pedal gearing changes if the motor is not used. Of course, they make a virtue of this :) but it means it would be awkward to have the motor switching on and off dependant on need....

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kisshu   100 mW

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Re: 2009 IZIP Express

Post by kisshu » Dec 22 2008 3:15pm

Fom what i understand its a fixed planetary gear system the only variable being the manual pedal gearing.
if i'm wrong please explain how this evo planetary hub changes gears?

Its not hard to build a hybrid drive system where the motor drives a 3 speed variable planetary hub or other variable gearing
combined with a trditional outer cog. When will it be done i don't know?
people are building their own so we know its possible.

the giant la twist dx is a disapointing front hub motor - when will they learn? Their previous design ran off the crank case and through the gearing - a superior design.

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Lower price and available earlier?

Post by Jerome Daoust » Jan 11 2009 10:41pm

ElectricBikesScooters.com in Encinitas, California, is saying:
Available in March and at a price of 2799 $US (200 less than price on manufacturer website).

Jerome Daoust   100 W

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Already available?

Post by Jerome Daoust » Jan 21 2009 1:59pm

TheSuperKids.com is saying it is already in stock, as of January 19.
Maybe just for the Medium size, with the Large available Later.

I sent them a message asking to confirm. They would be semi-local for me, so I could possibly get a test ride if they have it.

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Russell   10 MW

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Re: 2009 IZIP Express

Post by Russell » Jan 21 2009 2:36pm

Jeep Comanche Trekking Bike w/YOUE geared motor, 42 lbs + 15 lb rear trunk bag w/12S 16Ah LiPo battery, tools, etc., 21A controller, 700 x 40C tires. 27 MPH.


My other E-Bikes: Nashbar Steel Flatbar

Jerome Daoust   100 W

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Re: 2009 IZIP Express

Post by Jerome Daoust » Jan 21 2009 3:33pm

Russell wrote:Buy this one instead;
http://www.amazon.com/Trailz-Electric-M ... 517&sr=8-1
Thanks Russell,
but I have no interest in the Trailz model. Only 15 mph and 24V x 10A ==> 240 Wh. Compared to 20+ mph and 36 V x 18 Ah ==> 648 Wh for the Express.

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Russell   10 MW

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Re: 2009 IZIP Express

Post by Russell » Jan 21 2009 3:44pm

Run the Trailz at 36V!

-R
Jeep Comanche Trekking Bike w/YOUE geared motor, 42 lbs + 15 lb rear trunk bag w/12S 16Ah LiPo battery, tools, etc., 21A controller, 700 x 40C tires. 27 MPH.


My other E-Bikes: Nashbar Steel Flatbar

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Re: 2009 IZIP Express

Post by Jerome Daoust » Jan 21 2009 4:05pm

Russell wrote:Run the Trailz at 36V!
That probably requires some modifications, and to get a battery system with enough energy (I want 600+ Wh) would required an extra purchase and special install. I just want a complete solution, and a warranty. But thanks for the input Russell.

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Russell   10 MW

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Re: 2009 IZIP Express

Post by Russell » Jan 21 2009 4:41pm

Jerome Daoust wrote:
Russell wrote:Run the Trailz at 36V!
That probably requires some modifications, and to get a battery system with enough energy (I want 600+ Wh) would required an extra purchase and special install. I just want a complete solution, and a warranty. But thanks for the input Russell.
I was just messin' with ya. I pretty much figured if someone wants to shell out three big ones for an electric bike they wouldn't look twice at the lowly Trailz. At $300 delivered it's quite a deal though and I've read it really runs at 36V as long as you're prudent with the throttle :wink:

-R
Jeep Comanche Trekking Bike w/YOUE geared motor, 42 lbs + 15 lb rear trunk bag w/12S 16Ah LiPo battery, tools, etc., 21A controller, 700 x 40C tires. 27 MPH.


My other E-Bikes: Nashbar Steel Flatbar

Jerome Daoust   100 W

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Re: Already available?

Post by Jerome Daoust » Jan 21 2009 6:44pm

Jerome Daoust wrote:TheSuperKids.com is saying it is already in stock, as of January 19.
Maybe just for the Medium size, with the Large available Later.
I sent them a message asking to confirm. They would be semi-local for me, so I could possibly get a test ride if they have it.
They replied saying they have the bikes in boxes and ready for shipment, but they do not offer test rides.

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LA Times review

Post by Jerome Daoust » Jan 26 2009 5:45pm


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nomad85   10 kW

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Re: 2009 IZIP Express

Post by nomad85 » Jan 29 2009 10:26am

I'll sell you my bike for $2,995, its faster than that currie, and has 600+Wh of battery(48v 20Ah)...(j/k on the I'll sell it part)
Mine only cost... about $1500-1700 with an xtracycle attachment. It can go 30-32 mph without pedaling if there isn't a headwind, why not just make your own bike?

Didn't you recently get a bike from hipowercycles?
E-bike#2- Trek Xtracycle 45 mph top speed(@74v)
Trek 850/9C 9x7 rear motor / 74v 10Ah Lipo
Mileage since 10/20/08: 9500 miles as of 8/10

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Re: 2009 IZIP Express

Post by Jerome Daoust » Jan 29 2009 12:42pm

nomad85 wrote:why not just make your own bike?
I don't have the space or the patience for that. Just want something ready-made, and a warranty.
nomad85 wrote:Didn't you recently get a bike from hipowercycles?
Considered it, but no purchase.

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