The lazer rims are indeed wider, just don't use it all...
I also stretched the carcass when I mounted my first set of fronts on the kit supplied RB5 fronts which were 28mm wide. I then got lots of strange looks at my first race meeting....
Just about everybody at my club does what I'm about to describe below, so don't shoot me down...
The 4WD front rims have 4 ribs, two at the outer edges and a further two approx 7mm closer to the centre of the rim which make for 2 thin groves at the outside and one wider groove in the middle.
Simply mount the outer edge of the carcass in the outer groove and the inner edge of the carcass against the inner edge of the 2nd (not 3rd) groove. This leaves the 3rd groove on the inside of the rim exposed and looks a little odd at first until you remember that everone else's 2WD at the club looks the same.... (in my case anyway)
This gives the carcass the correct profile (I believe).
Sounds like a hack but using good tyre glue I haven't had a problem yet (and yes, I've not been doing it very long but there you go...)
If you intend to keep using that rim for 2WD fronts you can then dremel or cut away the exposed 3rd groove to make a more convential looking 2WD front.
I'll be honest and say that I didn't even know you could get 2WD front rims, I've only ever seen ZX5 sized front and rear rims for sale...but then I haven't been looking very hard...
WRT weight in the front, I found understeer to be a problem out of the box, now it's not so much or a problem....
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