New E-Bike build attempt

Update:
Since everyone suggested me to get a MTB with a stong fork but I did not want to have a prone seating position , I decided on a trekking bike with front suspension and hydraulic disc brakes:

https://www.fahrrad.de/cube-curve-pro-limenblack-540066.html

hope it's a better choice
What motor woud suit the bike to reach sought speeds ?
Will the 128 be sufficient for 30mph ?
Is there anything geared between a 128 and a MAC ?

Thanks
 
That's a 3x9 by Shimano - this implies that any of the 135mm cassette motors should fit (famous last words).

The Q128c I have been assured fits very well and delivers; I am still collecting all the pieces for my conversion, so I cannot tell yet.

Given that you live in Germany, have a go at https://www.pedelecforum.de/forum/index.php?forums/umbau-pedelecs.2/ where you will find alternatives discussed in German. In that forum, you will find references to very cheap packages such as http://www.ebay.de/itm/26-Zoll-Umbausatz-Heckmotor-E-bike-Conversion-Kit-36V-350W-LCD-Steckritzel-/201673975441, too - but those come with zero support, zero warranty (I guess) and uncertainty about the true power and fitness of the system.

For more upmarket solutions servicing Germany, have a look at https://elfkw.at/ and http://www.ebike-solutions.com/

Edit: Please disregard the product in the ebay link - that's 26". Go hunting for the equivalent in 28" with "Steckritzel".
 
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