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Swapping electric bike parts to another bike

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Swapping electric bike parts to another bike

Old 10-20-13, 04:23 PM
  #1  
ridiqls
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Swapping electric bike parts to another bike

Hello All,
I believe this belongs in bike mechanics and not electric bike cause it's more about the mechanical and technical issues, and also involves parts that are just limited to ebikes. But if this is in the long subforum, please feel free to move.

I ride an electric bike due to a disability that doesn't allow me to ride traditional bikes anymore. And due to said disability, I use the electric bike to provide myself transportation to save myself from long distance walking which I cannot also do much anymore. I like to use the bike to not only get around but I use it with a Walkie Dog leash to walk my german shepherd everywhere and also like to go trail riding, beach riding and doing general outdoors stuff. The electric portion allows me to do things I would have a difficult time doing with a normal bike.

I have a Currietech Ezip Trailz which is a mountain bike with a SLA battery that has a good amount of power.. good pedal assist and throttle. but it lacks one thing that I absolutely require. Portability. It weighs almost a whopping 70 lbs with the SLA battery and I can't take it anywhere with me unless I have access to a SUV or truck. My 350z doesn't allow for bike racks (trust me, the ones that exist are terrible).

I'd like to buy a folding Montague bike that is built like a mountain bike but will allow me to fold it and transport it in ANY small car. How difficult would it be to swap/transfer all the electric (and necessary) parts from the Currietech Ezip to a regular folding bike? From what I can see with my very unskilled eyes, there's a motor on the rear wheel or rear gearing. The rest of the stuff are wires and go to the controller in the back part of the bike under the rack.

Is this something that is easily doable or is it too much trouble than it's worth??

The reason I want to swap is because the folding ebikes are about $1200-1500 price point here AND they don't look or function like a mountain bike. The wheels are smaller, the seat and handles raise up really high and it lacks the sporty look I want. A montague type folding bike looks great, folds very small. All it needs is an electric power to it.


The other option is to sell the currietech as is, make about $200-400 or whaever I can get for it and then buy one of these kits: http://www.electric-bike-kit.com/hill-topper.aspx
But it's $500 for a very very small lithium battery and $800 for the 10ah lithium, which is way too expensive for me.


ANY help greatly appreciated.
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Old 10-20-13, 05:29 PM
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Originally Posted by ridiqls View Post
.........But it's $500 for a very very small lithium battery and $800 for the 10ah lithium, which is way too expensive for me.


ANY help greatly appreciated.
sell your 350Z and get a suitable car that handles a decent bike rack!
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Old 10-20-13, 05:40 PM
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Originally Posted by Bill Kapaun View Post
sell your 350Z and get a suitable car that handles a decent bike rack!
Hm Id rather not. I'd rather try to swap the electric components onto a suitable bike because despite having the 350z, space becomes an issue no matter what small car I get, whether it'd be a civic or subaru. Plus it doesn't make much financial sense to take thousands on a loss just so i can get a bike rack. The car is modified and I have spent a lot of time and money on it.

Anyone know if it's possible to move all the parts off the ezip currietech onto a regular bike? I went outside to the garage and took a look at all the wiring. It looks like there is a controller in the rack which has a few wires coming out of it, routed to the following: front brake lever (to sense when you are braking so it cuts the power), right and left side battery ports for either battery, the geared motor which uses a chain to spin the gear on the rear wheel, spinning it, and finally the hand controls/throttle handle.
I'm thinking of just putting the entire assembly off and swapping the front brake lever along with the rear wheel if possible.

Another question: Can you use a lithium ion battery instead of SLA for a bike that came with an SLA battery? Or are the controllers, wires all different?
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Old 10-20-13, 07:25 PM
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Let's reword to the question to be simpler.

Can I change the Currietech Ezip Trailz FRAME out with a Montague frame? There. I figured out the electrical stuff will still work on a different bike. I want to know if it's possible to just swap out the EZIP frame with a folding frame from Montague as seen here: http://www.montaguebikes.com/fit-700c-road-frame.html

if it is possible, all I will need is the frame and I will transfer everything from the Trailz to make it electric.
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Old 10-20-13, 07:57 PM
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Originally Posted by ridiqls View Post
Let's reword to the question to be simpler.

Can I change the Currietech Ezip Trailz FRAME out with a Montague frame? There. I figured out the electrical stuff will still work on a different bike. I want to know if it's possible to just swap out the EZIP frame with a folding frame from Montague as seen here: http://www.montaguebikes.com/fit-700c-road-frame.html

if it is possible, all I will need is the frame and I will transfer everything from the Trailz to make it electric.
It does not appear to be as simple as swapping parts.

Last edited by AnkleWork; 10-20-13 at 08:10 PM.
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Old 10-21-13, 02:50 AM
  #6  
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The spec I get up when I search for your current bike says it has 26" wheels, while the montague frame you've linked to is 700C AKA 28", making it a poor candidate for a swap. Dropout width is also likely to be different. The good money are on the current being 135 mm and the Montague being 130 mm.

The things you need to figure out to determine how easy/difficult it'll be to swap parts over are:
- rear dropout width
- how the motor is attached to the rear triangle
- how to hang the battery

The controls will swap right over, no problem there.
But getting a rack onto an Montague w/o interfering with the folding may be tricky. Don't know if a seat post mounted rack will hold up under your battery pack. An even it it does take the vertical load well, it might be difficult to keep it from flopping sideways.
I'm really hesitant even to guess about motor attachment, as there seems to be a definite lack of left side pics on the web. There pretty much has to be some sort of reaction arm thingy.
There's a little bit of concern there. I've thrashed frames intended for rim brakes by sticking coaster brake wheels in them and bending the chain stays. I have no idea if there's enough torque in your motor to do the same or if you're safe.

You can swap your SLA for a lithium-ion, as long as you match the voltage and the max current drain to what you have right now. And unless your current charger can deal with different battery chemistries, you'd need a new charger as well. One thing that might sour the deal is the connector. Unless you get the new battery from the same supplier, there's no guarantee that the new battery will fit your quick-release rack attachment.
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Old 10-21-13, 06:33 AM
  #7  
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Electric bikes are heavy. You don't really want to schlepp them around anyway. Get a hitch mounted to your 350z and get a hitch mounted rack.

Or get a folding bike and then go with a DIY electric hub motor solution.
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Old 10-21-13, 02:15 PM
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Originally Posted by dabac View Post
The spec I get up when I search for your current bike says it has 26" wheels, while the montague frame you've linked to is 700C AKA 28", making it a poor candidate for a swap. Dropout width is also likely to be different. The good money are on the current being 135 mm and the Montague being 130 mm.

The things you need to figure out to determine how easy/difficult it'll be to swap parts over are:
- rear dropout width
- how the motor is attached to the rear triangle
- how to hang the battery

The controls will swap right over, no problem there.
But getting a rack onto an Montague w/o interfering with the folding may be tricky. Don't know if a seat post mounted rack will hold up under your battery pack. An even it it does take the vertical load well, it might be difficult to keep it from flopping sideways.
I'm really hesitant even to guess about motor attachment, as there seems to be a definite lack of left side pics on the web. There pretty much has to be some sort of reaction arm thingy.
There's a little bit of concern there. I've thrashed frames intended for rim brakes by sticking coaster brake wheels in them and bending the chain stays. I have no idea if there's enough torque in your motor to do the same or if you're safe.

You can swap your SLA for a lithium-ion, as long as you match the voltage and the max current drain to what you have right now. And unless your current charger can deal with different battery chemistries, you'd need a new charger as well. One thing that might sour the deal is the connector. Unless you get the new battery from the same supplier, there's no guarantee that the new battery will fit your quick-release rack attachment.
Thank you. So you bring up very good point, I think Im going to scrap the idea. What does rear drop out width mean? My guess is the distance between the two triangles that hold the rear wheel? This swap is a lot more complicated than I had imagined so thank you for pointing that out. I have seen montagues with rear racks so I guess that wouldn't be a problem and the way the motor is mounted to the triangle is basically there are two holes. One attaches at the axle and the other I would probably have to drill further down to make it level. I guess its a lot of work, probably going to spend as much money as a electric bike new.


Originally Posted by IthaDan View Post
Electric bikes are heavy. You don't really want to schlepp them around anyway. Get a hitch mounted to your 350z and get a hitch mounted rack.

Or get a folding bike and then go with a DIY electric hub motor solution.
I'm considering the hitch mount on my Z. Other option I found is the Seasucker which got good reviews and I found a guy with a 350z that used it with success. $250 is a bit steep but if it works, I'm ok with it. Only thing is, the product page says it works for bikes up to 45 lbs. My bike is a whopping 65-68 lbs with the lead acid battery. So if I remove the battery (very easy to do), it'll be about 50-53 lbs. I can remove the seat post and also the front wheel comes off, so it should come in right at 45 lbs. From what I read, they are really sturdy vacuum mounts. I would still have to get a lithium ion battery but those are $399 from currietech so if that's the case, I'm better off getting a new e-bike with the lithium setup for $600! I am considering selling my trailz and just upgrading to a lithium bike and getting a rack now. Folding is best but there are no folding mountain bikes that are under $1500. Anything from $1000-1500 has very small tires with high handle bars and seat posts and look very weird too me.
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Old 10-21-13, 02:21 PM
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Originally Posted by IthaDan View Post
Get a hitch mounted to your 350z and get a hitch mounted rack.
This.
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Old 10-22-13, 02:03 AM
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Originally Posted by ridiqls View Post
.. What does rear drop out width mean? My guess is the distance between the two triangles that hold the rear wheel?
Pretty much so. Looking at your bike from the rear, you'll see the wheel being mounted between two vertical plates. The plates are the dropouts, and the distance between their inside faces is the dropout width.
The inside faces push against parts of the hub referred to as the locknuts, which gives the corresponding hub measurement of O.L.D. - Over-Locknut-Distance.

Originally Posted by ridiqls View Post
This swap is a lot more complicated than I had imagined
I'd say we don't know that yet. Installing a rack, replacing a rear wheel and a brake isn't exactly rocket science and well within the reach of home tinkering for someone with a bit of basic skills.

Originally Posted by ridiqls View Post
...I have seen montagues with rear racks...
If you say so. I haven't had any need to do any research so I really can't tell. There's probably a way to make it work well enough.

Originally Posted by ridiqls View Post
... the way the motor is mounted to the triangle is basically there are two holes. One attaches at the axle and the other I would probably have to drill further down to make it level.
Why not post a few left-side pics? That way, we'd have a better chance to judge what it'd take to transplant your drive to another bike.

It might be bolt-on to almost any frame, or it might require a specially adapted frame/dropout.

Originally Posted by ridiqls View Post
I guess its a lot of work, probably going to spend as much money as a electric bike new.
Again, there's really no telling. If it is a straight swap, I'd guess at 1-2 hour's work of moving parts over and installing the rack incl tidying up cabling and such. If it requires serious rework of the frame, then it can quickly become expensive. But if it is a straight swap, then it's comparable to perfectly manageable bike-DIY tasks.

Originally Posted by ridiqls View Post
Folding is best but there are no folding mountain bikes that are under $1500. Anything from $1000-1500 has very small tires with high handle bars and seat posts and look very weird too me.
Well I' can tell you straight off that the Montague is the best folding bike I've tried so far. There are others that are "good, considering", but you'll never forget that you're on a folder.
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Old 10-22-13, 10:17 AM
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Originally Posted by IthaDan View Post
Electric bikes are heavy. You don't really want to schlepp them around anyway. Get a hitch mounted to your 350z and get a hitch mounted rack.

Or get a folding bike and then go with a DIY electric hub motor solution.
Or better get a hitch mount rack that'll hold on of those Rascals or similar electric scooters.

Regarding the small tires/high bars and seat of the folders, I think you'd be surprised how well they actually work, weird looking notwithstanding.
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Old 10-22-13, 10:22 AM
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How much does the Montague weigh?

I'm thinking that by the time you transfer the motor and battery to the Montegue it's going to come real close to 70 pounds and still might be under designed for the eBike usage.
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