There is a lot of guessing going regarding the wear being experienced by owners with 21" wheels. Can you please post your rear tire inside shoulder wear experience providing ViN, miles, driving style and tire (Conti or Mich).
The following is from a thread I started over on the TM forum. I'll try to keep both threads current.
For those not familiar with camber, here is what 2 degrees of negative camber looks like in pictorial form looking from the rear an NO tire sidewall compliance. http://www.lolachampcar.com/images/Tesla/Alignment/camber Model (2).pdf
New Continentals have 8mm tread depth
New Pilots have 7.5mm tread depth
High Wear
lolachampcar 4288 800 miles Pilot 20% inside shoulder normal to mildly aggressive driving
JohnnyMac 1400 miles Continentals 7mm outside and 6mm inside conservative driving with some sprints
rodneynelson 5000 miles Continentals tires replaced for wear
mferrazano 2864 1600 miles replaced both tires and aligned by Tesla
Theresa 913 8500 miles cord showing on inside SC says toe is out (Rear Camber -1.8L -2.3R) Toe way out
rdaicanto 12780 730 miles Pilots early wear suggests 6-7K life Max Regen
Schlermie 27xx 6200 miles Continentals Rear 20% outside / 92% inside down to wear bars Moderate driving
sergiyz sig474 8400 miles Continentals rears replaced as they were down to the cord
carrerascott 5500 miles Continentals rears showing cord at 5500 miles
Jason S 10000 miles replaced (assume 21") Continentals Car found to have toe out
DJ Frustration 6000 miles 3/32" remaining on the inside
telsaguy P85 4000 miles (on 21s) 21" Continentals noticeable wear on the inside
rdalcanto P85+ 1400 miles 6/32 inner 8/32" outer alignment done at 7/32" inner wear
JohnnyMac 1500 miles inside down 25%
JaneW Continentals 4365 miles tires replaced - almost corded on inside of rear "fairly aggressive driving"
majgill 11700 tires replaced
FlasherZ S1049 4500 rears replaced
Normal Wear
Carefree 5430 4000 miles Michelins even wear on rear with normal driving
Keith72 4283 2000 miles Continentals even wear mostly tame driving
wormhole 45xx 5700 miles Continentals normal wear normal driving (339 WHr/Mile lifetime)
DC 1400 miles even wear (alignment just performed)
bradslee 2874 2400 miles Continentals even wear normal driving
Brian.S 1856 6200 miles Continentals even wear normal driving
Mark2131 1573 12150 miles Continentals even wear with slight cupping on inside normal driving with occasional flogging
TikiMan 14,500 miles Continentals slight cupping on rears before rotating to front a@ 10K miles
admjr 10843 1,500 miles Pilots slightly aggressive driving with no signs of wear
Velo1 7000 miles normal wear with rotation at 3500 and 7000 - alignment checked good
nickjhowe 2298 3000 miles Continentals 6.0-6.3 inside and 7.0-7.3 outside max regen
dennis DCWitt 6276 4200 miles Pilots 7mm front / 6.3mm rear even wear
rochec 6530 5100 miles Pilots normal wear
mferrazano 2864 5200 miles even wear (after alignment, see above)
drp 11000 miles reasonable life left (rotated at 5800 miles) mild driving max regen
VEnUB Sig127 11000 miles 7mm/2mm out/in tires replaced for sidewall damage (potholes)
DSM363 8800 miles (rotated at 3000) Depth In/Out (mm) Front 4.9/5.4 4.5/5.5 Rear 3.8/5.5 4.2/5.2 replaced at 10,200 miles with ~4mm outside/3mm inside tires
buzzbuzz 02xx 16000 miles Continentals (rotated at 6000) measured at 12,500 7/32" or 5.5mm all the way around normal driving style (expecting 25K from the tires)
NKYTA 1842 5000 miles Continentals Average driving plus test rides (LR inner showed wear but tracked down to toe) Max Regen
sia 11239 1650 miles Continental 7mm I/O front and rear 338 Whr/mile
Alex K araxara 3218 10,400 miles Continentals on track for 20K from tires (rotated at 7500) max regen 294 WHr/mile (complete tread measurements can be found pg 3 of ™ post)
jjs 3082 9000 miles (just rotated) Continentals 331 WHr/mile max regen tires wearing reasonably even
Chgd Up 25,250 miles (only 16K on these 21s) fronts at 6/32" replaced rears at 16,000 miles for cord showing 342 WHr/mile (lot of highway)
Jason 3156 11,800 miles Continentals 8/32" except for inside rear 7/32" expecting 20K miles 344 WHr/mile max regen
JonathanL 5000 miles on 21s with inside wear judging life to be 10k-12k miles
Brad Holt s85 3387 12000 miles Continentals "hardly any wear"
pilotSteve SigS 7500 mile service Continentals wear ok rotated at SC max regen
Kauai Contentals good wear for 4500 miles minor pulling right at 9000 miles with alignment at 11500 and significant inside wear. 3500 miles since alignment with stabilized wear
CnJsSigP Sig5xx 7700 miles Continentals LF6.5,6,6 RF6.5,6,6 LR7,7,6 RR7,7,6 mm rotated 6800 miles (rear toe roughly 1/16" total)
Cenarius P85+ 3500 miles 21 Pilots 6/32 inside and 7/32 outside both rears spirited and commuting
Andrew Wolfe S440 7700 miles 21" Continentals 7/32" on all four Moderate/Gentle 334 WHr/mile
ISF 1933 9600 miles 21" Continentals rotated at 4700 LF6/6/5 RF 6/6/5 LR6/7/5 RR5/6/5 out/mid/in
AIMc P85+ 2300 miles 21" Pilots 8/8/7 both rears out/mid/in
19" Owners with (tire) issues
Tommy 18600 replaced all four for inside shoulder wear. Rotation at 6K so two with 12K on rear and two with 6K on rear. 12K pair were bald on the inside shoulder.
JakeP 4996 5000 miles 4-5/32" rear and 8-9/32 front
Only Trons S85 8404 3300 miles 19" RSAs 9/32+ on all four tires max regen air sue 292 WHr/mile
timbers S85 5300 miles 19" 9/32 on all four tires 313 WHr/mile
Todd Burch S85 1653 11,300 miles 19" rears down to 3/32 on inside
mmx P85 2900 miles 19" wearing evenly
The following is from a thread I started over on the TM forum. I'll try to keep both threads current.
For those not familiar with camber, here is what 2 degrees of negative camber looks like in pictorial form looking from the rear an NO tire sidewall compliance. http://www.lolachampcar.com/images/Tesla/Alignment/camber Model (2).pdf
New Continentals have 8mm tread depth
New Pilots have 7.5mm tread depth
High Wear
lolachampcar 4288 800 miles Pilot 20% inside shoulder normal to mildly aggressive driving
JohnnyMac 1400 miles Continentals 7mm outside and 6mm inside conservative driving with some sprints
rodneynelson 5000 miles Continentals tires replaced for wear
mferrazano 2864 1600 miles replaced both tires and aligned by Tesla
Theresa 913 8500 miles cord showing on inside SC says toe is out (Rear Camber -1.8L -2.3R) Toe way out
rdaicanto 12780 730 miles Pilots early wear suggests 6-7K life Max Regen
Schlermie 27xx 6200 miles Continentals Rear 20% outside / 92% inside down to wear bars Moderate driving
sergiyz sig474 8400 miles Continentals rears replaced as they were down to the cord
carrerascott 5500 miles Continentals rears showing cord at 5500 miles
Jason S 10000 miles replaced (assume 21") Continentals Car found to have toe out
DJ Frustration 6000 miles 3/32" remaining on the inside
telsaguy P85 4000 miles (on 21s) 21" Continentals noticeable wear on the inside
rdalcanto P85+ 1400 miles 6/32 inner 8/32" outer alignment done at 7/32" inner wear
JohnnyMac 1500 miles inside down 25%
JaneW Continentals 4365 miles tires replaced - almost corded on inside of rear "fairly aggressive driving"
majgill 11700 tires replaced
FlasherZ S1049 4500 rears replaced
Normal Wear
Carefree 5430 4000 miles Michelins even wear on rear with normal driving
Keith72 4283 2000 miles Continentals even wear mostly tame driving
wormhole 45xx 5700 miles Continentals normal wear normal driving (339 WHr/Mile lifetime)
DC 1400 miles even wear (alignment just performed)
bradslee 2874 2400 miles Continentals even wear normal driving
Brian.S 1856 6200 miles Continentals even wear normal driving
Mark2131 1573 12150 miles Continentals even wear with slight cupping on inside normal driving with occasional flogging
TikiMan 14,500 miles Continentals slight cupping on rears before rotating to front a@ 10K miles
admjr 10843 1,500 miles Pilots slightly aggressive driving with no signs of wear
Velo1 7000 miles normal wear with rotation at 3500 and 7000 - alignment checked good
nickjhowe 2298 3000 miles Continentals 6.0-6.3 inside and 7.0-7.3 outside max regen
dennis DCWitt 6276 4200 miles Pilots 7mm front / 6.3mm rear even wear
rochec 6530 5100 miles Pilots normal wear
mferrazano 2864 5200 miles even wear (after alignment, see above)
drp 11000 miles reasonable life left (rotated at 5800 miles) mild driving max regen
VEnUB Sig127 11000 miles 7mm/2mm out/in tires replaced for sidewall damage (potholes)
DSM363 8800 miles (rotated at 3000) Depth In/Out (mm) Front 4.9/5.4 4.5/5.5 Rear 3.8/5.5 4.2/5.2 replaced at 10,200 miles with ~4mm outside/3mm inside tires
buzzbuzz 02xx 16000 miles Continentals (rotated at 6000) measured at 12,500 7/32" or 5.5mm all the way around normal driving style (expecting 25K from the tires)
NKYTA 1842 5000 miles Continentals Average driving plus test rides (LR inner showed wear but tracked down to toe) Max Regen
sia 11239 1650 miles Continental 7mm I/O front and rear 338 Whr/mile
Alex K araxara 3218 10,400 miles Continentals on track for 20K from tires (rotated at 7500) max regen 294 WHr/mile (complete tread measurements can be found pg 3 of ™ post)
jjs 3082 9000 miles (just rotated) Continentals 331 WHr/mile max regen tires wearing reasonably even
Chgd Up 25,250 miles (only 16K on these 21s) fronts at 6/32" replaced rears at 16,000 miles for cord showing 342 WHr/mile (lot of highway)
Jason 3156 11,800 miles Continentals 8/32" except for inside rear 7/32" expecting 20K miles 344 WHr/mile max regen
JonathanL 5000 miles on 21s with inside wear judging life to be 10k-12k miles
Brad Holt s85 3387 12000 miles Continentals "hardly any wear"
pilotSteve SigS 7500 mile service Continentals wear ok rotated at SC max regen
Kauai Contentals good wear for 4500 miles minor pulling right at 9000 miles with alignment at 11500 and significant inside wear. 3500 miles since alignment with stabilized wear
CnJsSigP Sig5xx 7700 miles Continentals LF6.5,6,6 RF6.5,6,6 LR7,7,6 RR7,7,6 mm rotated 6800 miles (rear toe roughly 1/16" total)
Cenarius P85+ 3500 miles 21 Pilots 6/32 inside and 7/32 outside both rears spirited and commuting
Andrew Wolfe S440 7700 miles 21" Continentals 7/32" on all four Moderate/Gentle 334 WHr/mile
ISF 1933 9600 miles 21" Continentals rotated at 4700 LF6/6/5 RF 6/6/5 LR6/7/5 RR5/6/5 out/mid/in
AIMc P85+ 2300 miles 21" Pilots 8/8/7 both rears out/mid/in
19" Owners with (tire) issues
Tommy 18600 replaced all four for inside shoulder wear. Rotation at 6K so two with 12K on rear and two with 6K on rear. 12K pair were bald on the inside shoulder.
JakeP 4996 5000 miles 4-5/32" rear and 8-9/32 front
Only Trons S85 8404 3300 miles 19" RSAs 9/32+ on all four tires max regen air sue 292 WHr/mile
timbers S85 5300 miles 19" 9/32 on all four tires 313 WHr/mile
Todd Burch S85 1653 11,300 miles 19" rears down to 3/32 on inside
mmx P85 2900 miles 19" wearing evenly
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