List of 18" wheels for P3D+

[dsgerbc]

Wheel width? Those tires look just the slightest bit stretched.

Pretty sure 18" Titans only come in 8.5

 

[MikeInFL]

Wheel width? Those tires look just the slightest bit stretched.

8.5” (Stock 18” tires)

 

[ElectricIAC]

8.5” (Stock 18” tires)

Gotcha. Maybe it’s just the angle then. Any meaningful results vs the stock 20”?

 

[Feathermerchan]

Yeah much better ride thanks to the weight reduction and I believe snappier acceleration. Plus with more sidewall, less chance of pinching the tire sidewall or bending/breaking a wheel.

 

[MikeInFL]

Weighed my tires/wheels today.

Titan 7 (18”) OEM Michelins

Signature SV104 (staggered 20”) Michelin PS4S

 

[Danny Brown]

After flip flopping a few times I decided I will order a set of 18x8.5 MW03 (If I had a regular AWD I’d even go 7.5) and determine what rubber I’ll put on once they arrive but at just under 18#/corner should be helpful.

Did you get your MW03’s yet?

I may order a set later this summer, but can’t decide between 18” or 19”.

 

[ElectricIAC]

Did you get your MW03’s yet?

I may order a set later this summer, but can’t decide between 18” or 19”.

Mrs negged them for the time being since her MY is impending but I may float them and list my 20’s up to recover the expense.

 

[Danny Brown]

Ahh gotcha.

Does anyone have good pics of their MW03s to show? I’ve seen only a handful on the internet (DirtyTesla & Clean3). The Martian Wheels website itself has some pretty low quality pics.

I’m really trying to decide on the looks of 18” vs 19”. Also trying to decide is the offsets they offer are truly what I want...

 

[ElectricIAC]

I prefer the idea of 18’s due to tires generally being cheaper.

But my thinking could be skewed on account of my driving an average of 30K miles/yr.

 

[Orwell]

Weighed my tires/wheels today.

Titan 7 (18”) OEM Michelins

Signature SV104 (staggered 20”) Michelin PS4S

That is some impressive weight for those 20" front wheels/tires.

 

[aggiechase37]

Let's get some efficiency numbers going for these no?

 

[Twing]

Let's get some efficiency numbers going for these no?

Yes can anyone can share some efficiency numbers (in terms of range, acceleration, etc.)? I m considering to have a 18x8.5 MW03 with OEM 18” tires.

 

[Feathermerchan]

MW03?
I have the 18" Titans on the car listed below with Michelin MXMV tires. I'd say around 270 Wh/mi
I was able to drive from Texarkana to Euless (~200 mi) at night in about 42 deg weather and have 40 miles of range left.

 

[ElectricIAC]

Yes can anyone can share some efficiency numbers (in terms of range, acceleration, etc.)? I m considering to have a 18x8.5 MW03 with OEM 18” tires.

I would probably end up trying the cheap tire challenge that Kyle from OOS has been messing with. Impressive for $55-70/corner for the Sentury or Nankang’s.

 

[MarcG]

I keep a very diligent log of my long-distance trips with lots of data points, so I'll share some that are relevant to this thread.
A few things to note on the way I log these trips:

• These are continuous drives on the highway, so there is no energy loss due to "idling" without moving
• All trips are at least 45 miles long to avoid short drives that are less meaningful
• The start and end of the trip, and hence data points collected, are both taken at highway speeds: after accelerating to join the highway, and before decelerating and taking the exit
• There are a lot more data points taken, such as date & time, locations, start and end RM, weather and road conditions, etc. which are not shown here as they don't seem to make as big an impact on efficiency as average speed, ambient temperature, and elevation change (and some of it is private)
• I've filtered out the trips that have high net elevation changes (over 500 feet in either direction), as those are more difficult to compare
• The only variable I don't record (yet) that can have a fairly significant impact is wind, as that can equate to a higher or lower average speed

With that out of the way, let's first look at my "baseline" data with the 20-inch wheels and PS4S tires that are stock on any M3P+, sorted by average speed:

Miles    Avg   Avg   Elev  Energy
Driven  Speed  Temp Change (Wh/mi)
54.0    60.7    64    157    303
129.2   66.4    68    236    306
122.9   67.6    84    246    277
111.0   69.8    86   -252    309
168.5   71.2    70    253    345
70.1    74.4    77   -155    297
68.3    74.5    63     46    290
205.3   75.6    75    344    278
144.5   77.4    59     98    348
183.8   77.5    48    377    328
111.2   77.5    70   -180    361

Now, let's examine the efficiency numbers with the 18" EV01+ wheels wrapped in Michelin MXM4 Primacy tires in stock sizes, again sorted by average speed:

Miles    Avg   Avg   Elev  Energy
Driven  Speed  Temp Change (Wh/mi)
135.7   63.8   36   -357    249
47.0    70.7   55     60    277
114.5   73.1   50   -123    310
184.9   78.2   41    105    320
82.2    80.1   34     76    299
133.3   83.4   41    -27    318
162.1   83.6   54   -214    317
162.0   83.8   43    214    326
46.5    87.8   36     80    364
91.5    88.1   30   -304    345

For similar speeds, this shows an energy consumption difference of about 20 to 50 Wh/mi, or roughly 5 to 15%, which is definitely not insignificant.

You'll note most average temperatures for trips taken with the 18" wheels were a fair bit colder, so I'll need to test again later this spring and summer when temps are higher again (and I have trips to take, once this shelter-in-place stuff is over).

So all in all, this bodes well for an average improvement in efficiency in the 10-12% range.

Finally, and as any good data deserves, here's a simple graph showing the energy consumption values over average speed for both wheel configurations:

 

[Twing]

I keep a very diligent log of my long-distance trips with lots of data points, so I'll share some that are relevant to this thread.
A few things to note on the way I log these trips:

• These are continuous drives on the highway, so there is no energy loss due to "idling" without moving
• All trips are at least 45 miles long to avoid short drives that are less meaningful
• The start and end of the trip, and hence data points collected, are both taken at highway speeds: after accelerating to join the highway, and before decelerating and taking the exit
• There are a lot more data points taken, such as date & time, locations, start and end RM, weather and road conditions, etc. which are not shown here as they don't seem to make as big an impact on efficiency as average speed, ambient temperature, and elevation change (and some of it is private)
• I've filtered out the trips that have high net elevation changes (over 500 feet in either direction), as those are more difficult to compare
• The only variable I don't record (yet) that can have a fairly significant impact is wind, as that can equate to a higher or lower average speed

With that out of the way, let's first look at my "baseline" data with the 20-inch wheels and PS4S tires that are stock on any M3P+, sorted by average speed:

Miles    Avg   Avg   Elev  Energy
Driven  Speed  Temp Change (Wh/mi)
54.0    60.7    64    157    303
129.2   66.4    68    236    306
122.9   67.6    84    246    277
111.0   69.8    86   -252    309
168.5   71.2    70    253    345
70.1    74.4    77   -155    297
68.3    74.5    63     46    290
205.3   75.6    75    344    278
144.5   77.4    59     98    348
183.8   77.5    48    377    328
111.2   77.5    70   -180    361

Now, let's examine the efficiency numbers with the 18" EV01+ wheels wrapped in Michelin MXM4 Primacy tires in stock sizes, again sorted by average speed:

Miles    Avg   Avg   Elev  Energy
Driven  Speed  Temp Change (Wh/mi)
135.7   63.8   36   -357    249
47.0    70.7   55     60    277
114.5   73.1   50   -123    310
184.9   78.2   41    105    320
82.2    80.1   34     76    299
133.3   83.4   41    -27    318
162.1   83.6   54   -214    317
162.0   83.8   43    214    326
46.5    87.8   36     80    364
91.5    88.1   30   -304    345

For similar speeds, this shows an energy consumption difference of about 20 to 50 Wh/mi, or roughly 5 to 15%, which is definitely not insignificant.

You'll note most average temperatures for trips taken with the 18" wheels were a fair bit colder, so I'll need to test again later this spring and summer when temps are higher again (and I have trips to take, once this shelter-in-place stuff is over).

So all in all, this bodes well for an average improvement in efficiency in the 10-12% range.

Finally, and as any good data deserves, here's a simple graph showing the energy consumption values over average speed for both wheel configurations:

View attachment 527807

Thanks for your data! looks 18” definitely helps in consumption.

 

[Feathermerchan]

Well that MAY be true. But there are 2 things going on here. 18" wheels and different tires. I think it is impossible to say which one caused the difference but my opinion is that it is mostly the tires. Tires with better traction usually have more rolling resistance.

 

[MarcG]

Well that MAY be true. But there are 2 things going on here. 18" wheels and different tires. I think it is impossible to say which one caused the difference but my opinion is that it is mostly the tires. Tires with better traction usually have more rolling resistance.

Yep, which is why I listed both tire compounds in my data. There's also the fact that there is less unsprung weight with the 18" wheel/tire combo, and that my EV01+ wheels have aero covers on them.

I do think there's a benefit to going from 20" to 18" wheels in terms of efficiency, but couldn't tell you how much that plays into the improvements. Would need same wheel style and same tire compounds for both tests, which I will leave for others to test.

 

[Feathermerchan]

Not unsurprising but I'd guess that the MP$S tires are not available in an 18" size that has the same outside diameter.
So it may well be impossible to test.
Yes lighter wheels are certainly better for lots of reasons. More sidewall is too.

 

[MarcG]

Not unsurprising but I'd guess that the MP$S tires are not available in an 18" size that has the same outside diameter.
So it may well be impossible to test.
Yes lighter wheels are certainly better for lots of reasons. More sidewall is too.

So yes, going to 18” wheels from 20 has lots of advantages in the way of efficiency (and other aspects such as ride comfort, longevity, tire size options, etc).