Tire sizes and wheel track
11-03-2019, 08:00 PM
#1
Junior Member
Thread Starter
Tire sizes and wheel track
I ordered the 21" AMG Multispoke wheels on our 450. What size tires are they putting on those? Also, if anyone knows the OEM tire, that would be great.
Edit - Holy Cow! I think I found the info at Tire Rack. 275/45/21 up front and 315/40/21 in back. I did not realized I was getting a staggered setup. Also, there are three possibilities on tires, Michelin Primacy Tour A/S, Pirelli Scorpion Zero A/S and Continental Crosscontact LX Sport. I think I would rather have the MIchelins.
Also, is the front and rear wheel track different?
Don't have an answer on this part though.
Edit - Holy Cow! I think I found the info at Tire Rack. 275/45/21 up front and 315/40/21 in back. I did not realized I was getting a staggered setup. Also, there are three possibilities on tires, Michelin Primacy Tour A/S, Pirelli Scorpion Zero A/S and Continental Crosscontact LX Sport. I think I would rather have the MIchelins.
Also, is the front and rear wheel track different?
Don't have an answer on this part though.
Last edited by Crispin; 11-03-2019 at 08:22 PM.
11-03-2019, 08:16 PM
#2
Senior Member
You can find tire/wheel info in the Dealer Order Guide. For 21", it's
275/45 R21 on 10 J x 21 ET 54 (Front)
315/40 R21 on 11 J x 21 ET 49 (Rear)
My 21" tires were Pirelli Scorpion Zero All Seasons but your mileage may vary.
[EDIT] Last 2 pages of the Dealer Order Guide might answer your wheel track question.
275/45 R21 on 10 J x 21 ET 54 (Front)
315/40 R21 on 11 J x 21 ET 49 (Rear)
My 21" tires were Pirelli Scorpion Zero All Seasons but your mileage may vary.
[EDIT] Last 2 pages of the Dealer Order Guide might answer your wheel track question.
Last edited by maalox; 11-03-2019 at 08:26 PM.
11-03-2019, 08:37 PM
#3
Junior Member
Thread Starter
Thanks, that document is handy.
Rear on the AMG is 46mm wider center to center (of tires). Tires are 40mm wider in back, so half of that is 20mm. So the rear sticks out 66mm more than front. That's noticeable.
Rear on the AMG is 46mm wider center to center (of tires). Tires are 40mm wider in back, so half of that is 20mm. So the rear sticks out 66mm more than front. That's noticeable.
11-03-2019, 09:29 PM
#4
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2020 GLE 450; 2023 BMW M2 Coupe
21" AMG wheel/tire comparison
Edit: Well, this is based on hubs in the same plane, which is not the case. Your calcs neglected to halve the tack width difference, so should be 23mm + 20mm = 43mm. What is not clear is the wider fenders in the rear, so the rears do not actually stick out that further from the bodywork. I just measured mine - distance from tire bulge to fender arch lip at top is 5/8" front & 3/4" rear. Add your location to your profile.
Last edited by GregW / Oregon; 11-04-2019 at 11:31 AM.
11-12-2019, 09:52 PM
#5
Junior Member
Different Rolling Diameters?
I have been working tire/wheel combinations attempting to develop a “square” -1 configuration for our GLE 450 which is due at the dealership tomorrow. I discovered in my calculations and confirmed by the previous writer that the 21” wheel/ tire package does not have the same rolling circumference front and back, 2452mm in front and 2465mm in back, a difference of about 1/2 of 1%.
My question is - Is this “close enough” that the MB engineers consider them “the same” or are the differentials geared differently to allow for the different rotational speeds of the axles?
My question is - Is this “close enough” that the MB engineers consider them “the same” or are the differentials geared differently to allow for the different rotational speeds of the axles?
11-13-2019, 12:50 AM
#6
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Join Date: Jul 2003
Location: Lake Oswego, OR
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2020 GLE 450; 2023 BMW M2 Coupe
Different tire diameters
I have been working tire/wheel combinations attempting to develop a “square” -1 configuration for our GLE 450 which is due at the dealership tomorrow. I discovered in my calculations and confirmed by the previous writer that the 21” wheel/ tire package does not have the same rolling circumference front and back, 2452mm in front and 2465mm in back, a difference of about 1/2 of 1%.
My question is - Is this “close enough” that the MB engineers consider them “the same” or are the differentials geared differently to allow for the different rotational speeds of the axles?
My question is - Is this “close enough” that the MB engineers consider them “the same” or are the differentials geared differently to allow for the different rotational speeds of the axles?
Last edited by GregW / Oregon; 11-13-2019 at 11:38 AM.
