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You dont need wheel spacers. AFIK the only difference is the diameter of the brake rotor. Only the RR has narrower wheels requiring a rotor spacer


Your Gen4 wheels should fit using your gen5 spacers. If necessary order a set of Gen5 spacers.

The only difference was 310mm vs 330mm rotors.
 

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I figured the wheel spacers would be good to go but my main concern was the rotors. I contacted a guy that used to make them on the forums and confirmed I need a 5mm spacer to align the brake discs with the calipers.
I do not believe that is true. Please post here what you find. The misconception comes from what dimension people are referring to. In order to use Gen5 rotors on a Gen4 spacers are required to move the caliper out from 210mm to 330mm. I do not believe the rotors spacing (width) is different between Gen4 and Gen5.
Please prove me wrong.

IF you are correct, then the RR Marchesinis should fit on the Gen4 without issue, as the RR has a narrower wheel and requires different brake rotors. On the flip side, If you are correct, the RR rotors should mount to the Gen4 wheels and work on the Gen5 just fine.

There is a lot of conflicting info out there. I have yet had anyone actually measure the rotor face to rotor face distance on a Gn4. to compare.
 

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I just looked up the wheel spacers and the Gen4 are 32mm and the GenV are 40mm. Thats 8mm per side. Which are the same spacers used on the RR Marchesini wheel. So now curious to measure the rotor pad on the wheel.

I wish I had a Gen4 wheel handy
 
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