Arachnid Range impact

[efusco]

I've driven on nothing buy the OEM 19" rims and tires for nearly 80k miles until my referral program 21" Arachnids were installed last Thursday. On Friday I drove over 180 miles to Kansas City, MO, so had a chance to see what sort of impact the new rims/tires would have. While this general issue has been discussed many times before in comparing 19" to 21" OEM rims, I hadn't seen it specific to the arachnids.

While I can't give an exact percentage comparison, I can tell you that I didn't really see a measurable difference in energy efficiency/range.

On the Trip up there is a slight (400') elevation decrease and winds were calm. Driving the speed limit I averaged ~282Wh/mi over the ~183 miles to the supercharger arriving with ~65 miles to spare after a 252 mile range charge.

Coming home was a bit more sketchy as with the elevation gain I also had a stiff headwind or quartering headwind the entire drive and my energy efficiency was closer to 333Wh/mi. That leg is always less efficient than the Northbound trip. Also, I had started with only 240mi rated range and arrived home with about 25 miles of rated, again right at 183 miles total.

Hoping this alleviates some of the anxiety I had before starting the trip for others making the switch.

 

[callmesam]

If the tires are new, then you'll need a bit more data. But early results are encouraging.

 

[efusco]

If the tires are new, then you'll need a bit more data. But early results are encouraging.

Sure, but I would expect the efficiency to improve, not worsen, with tire wear. I'd love a side by side comparison--same day, temp, route, speed, etc.

 

[callmesam]

Yes. Friction will be decreased on the tire edge, and efficiency will improve over the next 500-1000 miles.

 

[callmesam]

BTW, the rims look incredible. Screw efficiency ;-)

 

[efusco]

BTW, the rims look incredible. Screw efficiency ;-)

I just don't want them looking good on top of a flat bed when I can't make it to my destination!

 

[DIL]

They look great. What about the noise? Is it much louder than 19's?

 

[efusco]

They look great. What about the noise? Is it much louder than 19's?

It's noticeable, but not severe, probably a slightly rougher ride as well, but again, not bothersome.

 

[DIL]

It's noticeable, but not severe, probably a slightly rougher ride as well, but again, not bothersome.

hopefully *sportier* rather than just rougher

 

[jelloslug]

Do you happen to know the weight difference? That will tell all right there.

 

[TexasTeslaRacing]

Do you happen to know the weight difference? That will tell all right there.

According to dragtimes, the Arachnid wheels weigh 51.85 lbs. That's rims and wheel. The stock 21's weigh 55.25 lbs.

 

[FlatSix911]

I've driven on nothing buy the OEM 19" rims and tires for nearly 80k miles until my referral program 21" Arachnids were installed last Thursday. On Friday I drove over 180 miles to Kansas City, MO, so had a chance to see what sort of impact the new rims/tires would have. While this general issue has been discussed many times before in comparing 19" to 21" OEM rims, I hadn't seen it specific to the arachnids. While I can't give an exact percentage comparison, I can tell you that I didn't really see a measurable difference in energy efficiency/range. On the Trip up there is a slight (400') elevation decrease and winds were calm.
Driving the speed limit I averaged ~282Wh/mi over the ~183 miles to the supercharger arriving with ~65 miles to spare after a 252 mile range charge. Coming home was a bit more sketchy as with the elevation gain I also had a stiff headwind or quartering headwind the entire drive and my energy efficiency was closer to 333Wh/mi. That leg is always less efficient than the Northbound trip. Also, I had started with only 240mi rated range and arrived home with about 25 miles of rated, again right at 183 miles total.

Interesting data. Can't wait to get my Arachnids mounted for summer driving

 

[jelloslug]

According to dragtimes, the Arachnid wheels weigh 51.85 lbs. That's rims and wheel. The stock 21's weigh 55.25 lbs.

How about the stock 19"s?

 

[efusco]

According to dragtimes, the Arachnid wheels weigh 51.85 lbs. That's rims and wheel. The stock 21's weigh 55.25 lbs.

Ah, good info. Perhaps that explains the minimization of the range impact.About a lb. less per rim.

 

[efusco]

hopefully *sportier* rather than just rougher

LOL! Ah, sure...sportier it is!

 

[SabrToothSqrl]

Y'all worried about range and I'm over here doing burnouts for fun...

 

[SomeJoe7777]

What tires and sizes did they install? What are the arachnid wheel sizes? (21x8.5? 21x9? 21x10?) Square setup or staggered?

 

[TexasTeslaRacing]

I know the fronts are 245/35/21 and rears 265/35/21.

 

[FlatSix911]

What tires and sizes did they install? What are the arachnid wheel sizes? (21x8.5? 21x9? 21x10?) Square setup or staggered?

Specifications:
• 21″ Arachnid Wheel
•Size: 21 X 8.5″ front,21 X 9.0″ rear.
•Offset: +40 front, +40 rear
•PCD: 5X120
•Center Bore: 64.1mm
•Lug Nut Spec: 13/16 Hex, 14X1.50 Thread
•Lug Nut Torque Spec: 129 lb.-ft.
•Weight: 26.5 lb. front, 28.5 lb. rear

Package includes:
• 4 Arachnid wheels
• 4 Michelin Pilot Super Sport (PSS) tires
• 4 tire pressure sensors
• 4 Tesla logo wheel caps

 

[Zooomer]

I have 19's, 20's, and 21's. The 19s have winter tires on stock rims. 20's are a forgeline with low resistance tires. The 21's are OZ Zues forged with contisilent staggered.

I can say with absolute certainty that the determining factor is the tire, not so much the size, not so much the weight.
My 20's allow me to be below 290w @65 consistently. P100DL. The 19's use a little more but not much. The 21's use A LOT more. They are terrible for efficiency. The 21" rims are the lightest of the 3. They were $1600/rim.