Can you see what’s wrong with this electric bike design?

November 6, 2009 · 2 comments

NoPonderSideThe biggest problem is that it’s top heavy and the battery weight is behind the rear axle. The batteries weigh about 35lbs. This makes handling very shaky.

Another problem is the wide aluminum beach cruiser bars; they flex too much when trying to move all that weight which makes steering very vague and sloppy.

Those things coupled with balloon tires and a short wheelbase make it a very scary ride over 15mph. It starts to shimmy and will change lanes unexpectedly. Not a good thing in traffic.

So here is the plan. I’m going to chop the chain stays and seat stays off and move the whole thing back about 7”. Then, move the batteries down near the bottom bracket. Also, replace the aluminum bars with a steel bar. This should solve the major problems.

What do you think about this? Give me your opinion. Is this a good idea, bad idea? Have you done anything like this before? Did it help? Click on ‘comments’ below and let me know what you think.

{ 2 comments… read them below or add one }

1 samh December 18, 2009 at 2:44 pm

my ebike was top heavy too, until my orig SLA’s died and I upgraded to lifepo. the weight difference made a huge difference in the balance of the bike. I’m following your build closely!

2 Dan December 18, 2009 at 10:24 pm

Hi samh,
LiFePO is a great way to go especially if carrying them up on the wheel. As soon as my SLA’s die I’m going to get LiFePO. Having them down low and the reduced weight should be a great combination.

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