Tekno has a 44mm motor mount, which I use with my Hacker and Tekno motors.
http://www.teknorc.com/product_info....roducts_id=962
6 KiloWatt A123 Racer
GTP-Pletty Big Maxximum+RX8. GTP-C50-6L Hacker+RX8. CRT.5-Pro4+ZTW esc.
24s2p EVG SX 49.6mph Ebike.
18s4p Raptor 60mph Ebike. 11.5KW