Obiwan007
1 kW
Some may have noticed me hinting about my newest project on other threads over the last few months. Thought I better start my build thread before I got to far into the project. So my aim is to build a high powered electric heavy duty down hill fat bike. Full dual crown, high travel forks in what I beleive to be the best off road bike for electric conversions; the Giant DH Comp. I began, some time back (shortly after finishing my last project) to research the possibility of doing this. It difficult to build a regular full suspension fat bike and there are few components on the market to fit the bill. Also, those that do exist are pretty spendy. Nevertheless I have been haunting craigs,pink, ES, the bay, and other places for months now to acquire the foundation parts for the build. Here is what I have so far:
Giant DH Comp, complete bike with really good components but trashed wheels, 18" (medium, I know it's not the large but more on that later)
Risse Racing Trixxy dual crown forks. These babys are, as far as I know, the only dual crown forks on the market that will fit a full 4" wide fat tire.
V2 Cromotor. This motor was one of methods last ones and I got to meet up with him to pick it up and he and Mathew kindly took me on fun ride in their neck of the woods. I have since opened it up to put a heat sensor in it and did my custom disk flip mod as well as the freewheel mount modification that allows a 3-speed freewheel.:
Lyen 18 fet controller
A pair of 100mm wide Weinmann double wall fat tire rims. Just finished lacing up the front wheel today:
Brakes are off the original bike and they are hayes prime experts 203mm
I don't have tires yet but they will be the Vee Rubber V8s:
The rest I will get as I go along including a CA V3 (got to get a couple of these since I just upgraded my wife's motor in the "Electric Jeepster" to clyt 4060 and she now wants temp sensing and throttle mapping), and a Kiwi TA from Scott.
So obviously a 4" tire will not fit in the swing arm of the DH Comp. But my guy at Quality Heliarc has already looked at the project and will be modifying the front of the swing arm as well as the back to result in clearance for 4" tire in the front and 160mm symetrical drop out in the back. My first Giant with this mod is still going strong?
Also I am re-doing the battery box on this bike with a little help from some friends. The new battery box will be just slightly wider but will extend to the bottom of the down tube. This will provide additional space along the sides of the down tube for batteries. Also it will have an integrated mounting channel that fits the down tube and clamps firmly in place with no frame modifications. Additionally, it may be able to fit the controller inside, but if not it will have controller mounting on the bottom built-in. Because of the additional room it will provide enough space to make the 18" frame viable for 72-96V. We will be designing the box in SolidWorks for both the 18" and the 19" frames and in the end they will be orderable from MSM sheet metal. I'm still going to have the magnet cover in the back to cover the charging ports. One final thing to look for in this build will be some new, universal brake switches that I think you will all like. Tiny, easily adjustable, and works with any brake system you care to use. More on that later. To design the battery box in SolidWorks we needed a good, solid model of the 18" frame and a friend of a friend offered to digitally scan it for us. Here is a picture of the scan in progress:
Most everything I have done so far is the same as stuff I did in my previous Giant build so I have not chronicled it here. That build can be found here:
http://endless-sphere.com/forums/viewtopic.php?f=2&t=55605. As I go along I will try to take pictures but I often forget so sue me . Let me jus finish this opening post by saying thanks to all those on this list who have taught me so much over the last couple years and to Justin for making it possible.
Giant DH Comp, complete bike with really good components but trashed wheels, 18" (medium, I know it's not the large but more on that later)
Risse Racing Trixxy dual crown forks. These babys are, as far as I know, the only dual crown forks on the market that will fit a full 4" wide fat tire.
V2 Cromotor. This motor was one of methods last ones and I got to meet up with him to pick it up and he and Mathew kindly took me on fun ride in their neck of the woods. I have since opened it up to put a heat sensor in it and did my custom disk flip mod as well as the freewheel mount modification that allows a 3-speed freewheel.:
Lyen 18 fet controller
A pair of 100mm wide Weinmann double wall fat tire rims. Just finished lacing up the front wheel today:
Brakes are off the original bike and they are hayes prime experts 203mm
I don't have tires yet but they will be the Vee Rubber V8s:
The rest I will get as I go along including a CA V3 (got to get a couple of these since I just upgraded my wife's motor in the "Electric Jeepster" to clyt 4060 and she now wants temp sensing and throttle mapping), and a Kiwi TA from Scott.
So obviously a 4" tire will not fit in the swing arm of the DH Comp. But my guy at Quality Heliarc has already looked at the project and will be modifying the front of the swing arm as well as the back to result in clearance for 4" tire in the front and 160mm symetrical drop out in the back. My first Giant with this mod is still going strong?
Also I am re-doing the battery box on this bike with a little help from some friends. The new battery box will be just slightly wider but will extend to the bottom of the down tube. This will provide additional space along the sides of the down tube for batteries. Also it will have an integrated mounting channel that fits the down tube and clamps firmly in place with no frame modifications. Additionally, it may be able to fit the controller inside, but if not it will have controller mounting on the bottom built-in. Because of the additional room it will provide enough space to make the 18" frame viable for 72-96V. We will be designing the box in SolidWorks for both the 18" and the 19" frames and in the end they will be orderable from MSM sheet metal. I'm still going to have the magnet cover in the back to cover the charging ports. One final thing to look for in this build will be some new, universal brake switches that I think you will all like. Tiny, easily adjustable, and works with any brake system you care to use. More on that later. To design the battery box in SolidWorks we needed a good, solid model of the 18" frame and a friend of a friend offered to digitally scan it for us. Here is a picture of the scan in progress:
Most everything I have done so far is the same as stuff I did in my previous Giant build so I have not chronicled it here. That build can be found here:
http://endless-sphere.com/forums/viewtopic.php?f=2&t=55605. As I go along I will try to take pictures but I often forget so sue me . Let me jus finish this opening post by saying thanks to all those on this list who have taught me so much over the last couple years and to Justin for making it possible.