[JordiR]

Who told you the stock JJUAN calipers are designed for 320mm rotors?

Front radial caliper 2P die cast. 108mm interaxis. | J.Juan

Radial caliper 2P die cast . 108mm interaxis | J.Juan

MAX disc diameter

320mm

 

[hussain6474]

4*10mm thick spacers M10 clearance and 20mmOD. And 4*10mm longer caliper bolts from KTM. Exactly what Rottweiler provide. Hardly a Rocket Science thing. Already have some CNC 7075 Spacers - odd that 😉

But seems to me a no brainer that if you want to lighten the front unsprung weight and go to alloy centered discs then one might as well go to 320 as well. So either 320mm profiled disks as Rottweiler or 320 890R discs.

Also worth noting that the JJUAN calipers were originally designed for 320mm discs. They would however not work well with 340mm. This from mates here that race at club level and have JJUAN fitted. Not on KTM though.

Obviously one would fit new pads with new discs and they'd be EBC HH.

Can u pls share me the part numbers for the spacers & longer bolts?
Do the 690 r calliper bolts & spacers fit on the 2019 790 duke calliper if we plan to install the 320mm rotors?