Crystalyte 5303 Rear Disc Mounted on Kona Mountain bike
Just received my Rear 5303 motor and I had all sorts of pain mounting this
beast to a 2008 Kona mountain bike with 7"/7" travel. Took me a week or so of
filing, tweaking, and deciding which configuration and which washer and spacer
combo to use. Brakes rubbed real bad at first which was almost unbearable. Had
to space out the rear disc with some flat steel washers to get it to line up
correctly. Battery is 48V 20Ah LifePO4 and 48V 40A controller.
Top speed so far is 58.5 KpH. Here is a pic:
Here is a shot of the semi-completed project outside our lovely patio in Japan. I used an orange
standard 110V plug and receptacle as my "on-off" switch.

A closeup of the 7 speed rear cog and the Maxxis Hookworm Tires.
These tires are are "beasts" and the best IMHO to run with
electric motors in street settings. They ride so smooth and
gained at least 5kph when I switched. Warning: They are WIDE!


Have since far exceeded the 60+ kph barrier with just 48 volts @ approximately 56.0 V max
and 51.9 volts constant.
I do not, repeat, do not run an inline fuse so it is risky at best. However, have a cycle analyst.
Am running 26 X 2.5 Maxxis Hookworm Street tires(as posted earlier)and new wire configuration. I do
not condone running this fast but just an experiment. I will concentrate on mileage and longevity
in the future. So far top speed is 65.1 KPH.

Can you mount that 4840 crystalyte controller in a trunk bag? I have a phoenix racer kit on a giant mountain bike and I have everything in the rear trunk bag. The controller gets hot in the bag but it hasn't shut off yet. I just did this and have only recorded a 5 mile test run. So I am curiuos to know if anyone has mounted their 4840 controller in the trunk bag and how did that go?
Hey hguido, show me a pic of that baby!
As far as the controller mounted in a bag, I'm sure if the weather was cool enough
and you didn't go on lengthy trips, it should be ok. I would not recommend this as
that you want to avoid anything that would contribute to overheating or exposing the
controller to higher temperatures. Placing it in a spot where it can get fresh cool
air would be your best bet. Anyone else want to chime in on this?









Sorry, the first pic did not turn out. Here is a look at the rear (5303 8" disc) with D.O.P.E. and rear floating braking system.
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