Yes my bike is a fuji discovery-2 2004 mountain bike. It has 26" wheels and I am now looking into getting a decent 700c road bike to transfer my system onto. I can assure everyone who is interested there is no inherent limit to brushless motors in the general sense. It is that any dc motor is also a generator. the output voltage of the motor (generator) when spinning is directly proportional to the RPM it is spinning at. Once the RPM of the motor is fast enough that the output of it is equivalent to the voltage of the battery system being used to drive it as a motor, then you have reached the maximum rpm of that system. This is a fact.

When I lift the back and hit the throttle my speed with a full charge goes to 25.9MPH! That is with the battery measuring 41.9Vdc. when I let the battery get down to 38Vdc then the same test yields a no load speed of 22MPH. In both cases the current meter bargraph drops to zero immediately and remains there while the speeds maintains those cited above.

BTW i was poking around their website and found that this:

Motor 250w 20mm 280rpm - standard (24", 26" et 700) (rim not included)
Motor 250w 20mm 240rpm - Europe (700) (rim not included)
Motor 250w 20mm 280rpm - front wheel (24", 26" et 700) (rim not included)
Motor 250w 20mm 370rpm - 18" or 20" wheel (rim not included)
Motor 350w 25mm 300rpm - front wheel (24", 26" et 700) (rim not included)
Motor 350w 25mm 300rpm - standard (24", 26" et 700) (rim not included)
Motor 350w 25mm 385rpm - 18" or 20" wheel (rim not included)

Taken from there component price sheet. Notice how the description of the various motors they sell includes an RPM? I am assuming that is the max RPM for the system voltage that each particular wheel will do...so, one could potentially buy the motor for the 20" wheel and re-thread it onto a 700c wheel for a potential of 385*Pi*27.559"*60/12/5280=31.565MPH !!

(That is Revolutions Per Minute times Pi (3.141) times diameter of 700c wheel * 60 minutes in an hour divided by 12 inches in a foot and divided again by 5,280 feet in a mile)

This says the hypothetical max speed of my 350 watt motor/wheel/bike at nominal voltage is 23.2MPH. that is about right. It would be fun to go 32 before adding human power though?!

Just a thought. Any recommendations on a decent road bike?

Thanks,

BionxRider