I have both the KTM Galfer rotor and Moto Master flame rotor, galfer is slightly lighter, but it's the opposite for the rear rotors
I think the quality is slightly better than moto master as well but they are both good
Sorry correction the Difference between Nitron R1 and R2 is the Shaft/Rod size and the piston is 40mm on all of them.
K-Tech is a very small 35MM piston and looks like Ohlins is indeed slightly bigger than YSS at 46mm
The K-Tech is 14-35MM piston
Nitron R1 is 14-40MM
Nitron R2-R3 is 16-40MM...
Also stay away from K-Tech Razor rear shock, the piston size is too small almost like a shock for scooters
Nitron R2 and R3 and YSS have 45mm pistons size which is largest you can get for the RC I think,
also worth noting Nitron R1 piston (street version) is a bit smaller than R2 and R3 even...
You can get Low and High speed Comp with Nitron R3 or YSS
I got the YSS and the setup is really good because the external reservoir is not attached to hose and doesn't get in the way. It is fitted upside down (foam bumper at the top)
this one also have hydraulic preload damping which make...
Just get a 2nd radiator mounted and be done with it
http://www.feburstore.com/en/racing-radiators/1216-additional-stock-radiator-ktm-rc-390-2015-2016.html