Tech help please Rear Diff question

[Fatboy 18]

I have a question for the tech guys.

Here's what happened.
while out on a weekend with many other viper owners one owner sadly got a flat in his Gen 3/4 and could not continue the journey.
I stopped and tried to help, we managed to jack up the car and get the wheel off but sadly my Gen II spare would not fit onto the Gen 3 due to the size of the rear brake caliper.
I know Mark at IPSCO makes an adapter to bolt onto the rear wheel hub to allow a spare wheel to be used, but the spare wheel on a gen II is a 17" space saver!

So the question is could you use this space saver (with the hub adapter) as an emergency to continue your Journey without damaging the rear diff?

Thanks.

[donk_316]

Are the left and right wheels the same diameter?

[Fatboy 18]

NO, that's the point, the gen II space saver wheel is 17" I believe the rears on a gen 4 are 19" therefore 2" difference in diameter

[Boosted Motorsports]

NO, that's the point, the gen II space saver wheel is 17" I believe the rears on a gen 4 are 19" therefore 2" difference in diameter

Hmm not necessarily... What tire is on the 17" rim? I've never looked at mine to see but I would guess the overall diameter is still smaller than the factory 18" BBS wheels/tires on my car as well. Rim size is a bit irrelevant but overall wheel diameter (with tire) would be better to look at.

[donk_316]

Yeah rim size doesn't matter... what's the wheel (tire) sizes?

[Boosted Motorsports]

Yeah rim size doesn't matter... what's the wheel (tire) sizes?

Are you saying size doesn't matter?

[BrianACR]

Are you saying size doesn't matter?

That's not what she said...

As long as the overall diameter is the same it would be just fine. And from what I've heard, a short trip on mismatched diameters wouldn't hurt anything.