amberwolf wrote:My only caution to you is to add some sort of independent suspension to the wheels, or you will only be able to ride it (with traction) on a completely flat surface, like a wide sidewalk. Most roads are crowned, and so if you are not going perfectly straight down them, you won't have all four wheels on the ground. If there are even minor surface imperfections or variations in height, like ripples in the asphalt (pretty common on most roads), you'll have at best reduced traction on one or more wheels.
Think of a four-legged chair on an uneven surface; it rocks back and forth, with at least one leg always off the ground, unless you stuff something into the gap.
One other consideration is that in many places, a bicycle is legally defined as having two or three wheels in contact with the ground (not four or more), and a quad might get you harassed. Possibly not in your city, given the uniqueness of it, but it certainly happens here.
Chalo wrote:If you need more front wheel traction, shift the weight forward. Longer handlebar stem, tilt the bars forward a bit, rotate the seat clamp to the front of the seatpost, mount some of the batteries on a front rack.
I'm configuring a bike for my wife with a front X5305 running on 48V. Since that setup can make a decent amount of climbing torque for a sustained period, front wheel traction is an issue. I'm using relatively low and forward handlebars, and I'm putting the 20 pound battery pack on a rack over the front wheel. I'll be using a big fat street tire at modest pressure. http://www.bikeman.com/TR3744.html
22+ pounds of front hub motor doesn't hurt, either.
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