chvidgov.bc.ca
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I was looking closely at how my Bob trailer is put together and I had a EUREKA moment, seeing a loose stem lying around.
a.) Removed most of BOB trailer from the fork attachment, by undoing the two bolts which hold the Bob platform to the Bob fork attachment, leaving the following part (which can be bought separately from the BOB people) as standalone, attached to BOB Nutz on my axles:
http://www.bobgear.com/accessories/accessory_popup.php?accessories_id=19
b.) The vertical piece of one inch steel rod at the very back is perfect to attach a quill stem (so it can still swivel - not too tight) as though it were a handlebar, leaving the quill part pointing backwards, away from the bike. If you attach a fork directly to the quill, and tighten it right up you have a backward facing fork ready to accept a front hub motor. You can put a pipe clamp around the vertical, under the stem surround to prevent slippage down, if the stem is loose around the vertical. So, you have 2 degrees of freedom of movement of the fork - up and down with the BOB part, and right and left turning, with the stem. Perfect. No rotational movement/twisting along the axis of the pusher which is undesirable.
This is very easy - I built the pusher in about 20 minutes - at least the basic idea. I tested it and it trailed great, and really sturdy. So now I just need to add the hub motor. The axis of the fork is level with the ground about 10 inches above the ground. The longer the quill, the further the e-wheel will be from the bike. Of course people have done this with the whole Bob trailer itself, which is good for carrying batteries, but I wanted a minimal pusher.
I was impressed by the simplicity of this idea and will be engaged in building and testing it, with a 20" geared brushed with Ping battery that I have.
Of course you would have to buy the part from the Bob people and the Bob nutz too. I made some Bob hitch pins myself.
Here is the final product:
View attachment Pusher.JPG
a.) Removed most of BOB trailer from the fork attachment, by undoing the two bolts which hold the Bob platform to the Bob fork attachment, leaving the following part (which can be bought separately from the BOB people) as standalone, attached to BOB Nutz on my axles:
http://www.bobgear.com/accessories/accessory_popup.php?accessories_id=19
b.) The vertical piece of one inch steel rod at the very back is perfect to attach a quill stem (so it can still swivel - not too tight) as though it were a handlebar, leaving the quill part pointing backwards, away from the bike. If you attach a fork directly to the quill, and tighten it right up you have a backward facing fork ready to accept a front hub motor. You can put a pipe clamp around the vertical, under the stem surround to prevent slippage down, if the stem is loose around the vertical. So, you have 2 degrees of freedom of movement of the fork - up and down with the BOB part, and right and left turning, with the stem. Perfect. No rotational movement/twisting along the axis of the pusher which is undesirable.
This is very easy - I built the pusher in about 20 minutes - at least the basic idea. I tested it and it trailed great, and really sturdy. So now I just need to add the hub motor. The axis of the fork is level with the ground about 10 inches above the ground. The longer the quill, the further the e-wheel will be from the bike. Of course people have done this with the whole Bob trailer itself, which is good for carrying batteries, but I wanted a minimal pusher.
I was impressed by the simplicity of this idea and will be engaged in building and testing it, with a 20" geared brushed with Ping battery that I have.
Of course you would have to buy the part from the Bob people and the Bob nutz too. I made some Bob hitch pins myself.
Here is the final product:
View attachment Pusher.JPG