Moustache Samedi 27 X2
Wow, that’s not so stupid! It’s a great idea, to increase and combine effort, or when the two riders do not have the same level of fitness, with children, with a trailer, to go further, to bomb uphill (because everyone knows that a tandem… it bombs along especially on the flat).
1st challenge: the motor…
Put it at the front, easy… but it’s impossible to synchronize the cranks due to the motor freewheel… so, forget that if you want to maintain a decent ride.
Therefore we decided to put it at the rear… but we had to innovate! So we created a unique interface and special cranks to link the front and rear cranksets despite the motor being at the back.
2nd challenge: the stiffness!
Fortunately we already have our triple cavity tubes that have made our task easier!
3rd challenge: the range.
And for this we can thanks Bosch who have developed a «Y» «DualBattery» wire to safely connect 2 batteries in order to get an incredible capacity of 1000 Wh! The system intelligently manages power between the two batteries during charging and discharging, which increases their lifetime.