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Still working on this. The only place I've found so far that will order me a 155 80 18 tire (0.3 percent bigger than stock) is Pep Boys, and they want $314 for it.
Tire Rack has the 145 80 18 tire (2 percent smaller than stock) for $203 prior to shipping.
You might mention to Tire Rack what you are attempting here. It would be to their benefit for you to find a tire/wheel that works out. They then could put together a suggested package for Model S owners. With this in mind, maybe they would loan you or sell you one discount.
Just be sure that the percent-bigger/smaller-than stock is based on the tire RPM, not the overall diameter.
Revolutions per mile (km) | 728.59 (452.72) | 743.28 (461.85) | 14.69 (9.13) 2% |
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Ok, so I drove around a bit on the compact wheel and existing, smaller diameter tire.
As expected, it freaked the car out, and the car disabled a whole list of features, including ABS, traction control, stability control, and regen. Power assistance to the steering seemed gone, as well, or at least greatly reduced.
The good news is a) the car was still driveable, though you obviously had to be careful, and b) when I put the stock 19" wheel back on, it cleared all those errors within a few feet.
So, I would definitely suggest a bigger tire. The 155/80 I mentioned above is probably the right choice, assuming I can find one with sufficient load rating. Will work on that after the holiday.
It remains to be seen whether using that size (which is still not exactly the same as the others) will cause the same problems.
When my car had a flat with only 30 PSI there was no problem with the traction control at 30 mph. This flat of a tire with 19 inch wheel looked to be at least 2 inches flatter than standard. I think your solution will work. Please let us know all sizes in one post if it works. Thanks
The RPM of your OE tire was dictated by the circumference of the steel belts, not the radius when it lost air. It would still have virtually the same RPM at 15 psi.
Great idea. JST, nice work. I suggest PMing doc@tirerack here -- he is a sponsor of TMC.
The Tire Rack is proud to be a part of teslamotorsclub.com!
I sent him a message, but he has not gotten back to me.
I'm still hunting around. The Mercury Marauder from 2003 and 2004 is the only car I've been able to confirm uses the 155/80 18 size. The local Ford dealer has the same Bridgestone Tempa Spare as Pep Boys, and also wants north of $300 for it. I found a reference to a Uniroyal tire in that size, but I don't know what car it was used on and haven't been able to find a dealer willing to order me one.
> The Mercury Marauder from 2003 and 2004 is the only car I've been able to confirm uses the 155/80 18 size. [JST]
One could keep an eye on <www.car-part.com> for this exact spare tire. List the junkyards by distance.
This is turning into a real $$$ fest, but MS owners might be strongly motivated by having enough space available in Frunk for a briefcase or travel bag on top of the space saver spare. If you have 2 full sets of wheels already and can afford that space loss plus the extra weight of the full size tire then why bother. Plus the stock wheels will fit in the back; space saver might get interference from parking caliper(?).
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Found a tool for those 175Nm lug nuts yet?
Found a tool for those 175Nm lug nuts yet?
Actually, thats not true. Some auto manufactures are going to an "indirect" tire pressure monitoring system where there is no TPMS mounted inside the rim.