New Haibikes for 2012

[eddieo]

A few videos on you tube how to de restrict the Bosch..I would have to get some help as although it looks easy enough a bit beyond me.


What is a major concern is the price of the battery's, as the penny has just dropped and for the Ah rating these are probably the most expensive e bike batteries going....... with the possible exception of BionX

they should be at least £200 cheaper

 

[flecc]

Kitchenman says 'It out performs the 14 speed Rohloff '

Noooooo, that's like swearing - it aint right!

Secondly, with the new 2012 bikes, has the speed limit been solved yet? I would love to replace my mountain bike but the 15mph assist is just not enough.

I'm with Kitchenman, I much prefer the Dualdrive, despite the derailleur disadvantages. I don't like the Rohloff noise in the lower gears, or it's "iffy" 7th to 8th gear change. And it's not as efficient as the Dualdrive, despite their unbelievable claims.

Units like the Bosch which derive the speed limit from a wheel mounted magnetic sensor can usually achieve higher speeds by transferring the sensor and magnet to the unit and a crank arm. That way the road speed per rotation is multiplied in the higher gears.

 

[Deleted member 4366]

I looked at the video of how to make your Bosch go way over 50kph, and it appears to be very straight forward.

There's a magnet on the wheel that the control system uses to measure the speed - like on the Tonaro. I'm guessing that the Bosch won't work without receiving pulses from the magnet, so you have to get slower pulses from somewhere other than the wheel. The solution is to remove the sensor from the frame, make a new bracket to bring it close to the back of the crank and put a new magnet on the back of the crank. The sensor then gets pulses from the crank speed (cadence) rather than the wheel, so it thinks you're going much slower than you are and keeps the power on.

What a shame the batteries only a puny 8aH. It would be much more worthwhile if it had a 20aH Ping.

In the video, the guy makes a rather clever reversing latching bracket so that you can switch the sensor between the wheel magnet and the crank magnet. I guess that's because it'll be difficult to keep the speed down for normal use when unrestricted - maybe like my Beastamatic, which wants to accelerate up to its max speed all the time, which is too fast to pedal.