i debated this exact situation 2 years ago. i thought and thought and thought about it, but did not like the look of the Slipstreams. I put the Arachnids on and never looked back. They are still very smooth and maybe a bit louder, but its all what you get used to. I don't even notice them any more. i hardly make any long trips in my 75, so range may be affected, but i barely notice that. I got 26k out of the first set of tires, which is way more than i thought i would get. The looks of the Arachnids are awesome. Really completes the car well. If you are worried about blowing out tires, buy the road hazard warranty. I bought the entire set with the road hazard for about $1400 (same Michelin's that it had before). Put them on and don't look back. That's the advice i was given and i'm glad i did.
- I know range will almost certainly be affected. But I'd like to understand by how much? My particular car is a 75D with air suspension. I know absolute ranges will vary by configuration and battery size but if someone who has made this switch can tell me at least a percentage lost, that would be great. Is it a 5% hit to range? 10%? More? I know this wheel is less aerodynamic compared to the Slipstreams and a larger tire patch (while helping handling) will increase rolling resistance.
- Is there any difference in noise level? Is one noticeably quieter than the other, or is it pretty much a wash?
- How much difference is there in ride quality. Are the Arachnids overly harsh on the highway/freeway with respect to not-great-roads and small potholes?
I went from 19" slipstreams to arachnids on my S75 RWD so no air suspension. The range went from around 249 to 235. Maybe the noise increased but I'm sure I just got used to it by now. While I didn't immediately recognize a difference in ride quality when going from the slipstreams to arachnids, I have had the slipstreams put back on a couple times (once for a road trip and once to get the arachnids powder coated). Going from 21" to 19" I did notice the ride got smoother. But going back to 21" I get used to it so fast it really doesn't matter to me.
I'm also not the type of driver that'll notice performance or handling increases so really the only upside for me to use the arachnids are the looks. To which I believe they are totally worth it.
I assume your tires were the same Michelin Super Sports that came pre-mounted on the Arachnids that were delivered to me?