i have gen 4 rims on mine without too much work.

 

let me know how you get them fitted on!

i have both a first gen set of forks and first gen swingarm, with the nissin monoblock calipers from a 2019 zx6r and then zx14r brembo rotors.

the bike is a zx7r with these parts fitted

just let me know how its done and also any possible concerns when doing this.

 

If you want to use front 2/3 gen rim on 1st gen just change the bearings/seals.
Note: 2/3 gen use 25x47x12 . 1st gen use 20x42x12 . 20x47x12 is hard to find and is not cheap. So you can use 20x47x14 and remove 2mm from each side spacer (or made new spacers).

Rear rim set is the same .

 

this feels like a blur from a year or two ago but heres what i have for notes on fitting gen 4 wheels on the gen 1:

rear wheel bearings - 20 x 52 x 15
sprocket carrier bearing - 30 x 55 x 13 (this might be the stock size)
front wheel bearings - 20 x 47 x 12

front seals - 30 x 47 x 5
rear seals - 28 x 52 x 5
sprocket carrier seal - 35 x 55 x 7 (this might be the stock size)

i'm pretty sure i used the gen 1 sprocket carrier/hub spacer/cush drive and it dropped right into the gen 4 wheel.
For the wheel spacers, i used a set of captive spacers for the gen 1 zx10r.
I went with gen 4 calipers/rotors and it required a 10mm spacer under the calipers and matching bolts.