20 Tire size recommendation
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Joined: Apr 2022
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From: Seattle, WA
GLE350
20 Tire size recommendation
Im looking to pick up some used wheels (20x8.5 all around) with 245/45/20 tires installed already. Does this fit or would I need a thinner tires? If so, what tire size is recommended? Car is stock height. Dont plan on lowering it (I think). Appreciate the help.
Junior Member
Joined: Sep 2020
Posts: 46
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From: Charlotte, NC
E450 4Matic Wagon '19, MDX '09, 9-5 Aero '03, 280ZX '79, BelAir '57, VF700S Sabre '84
The 20x8.5 around should be OK, but check the ET/offset value on these wheels and check it on all 4 of them.
I think the tires will physically fit in a W213 but - 245/45 is a tire with 730mm diameter (109mm sidewall). The stock diameter on the W213 is around 680mm. This will make your speedometer off by about 7% (you will be going faster than what it is showing).
You can play with wheel and tire sizes here: https://www.wheel-size.com/calc/
There are number of other posts on the topic of wheel sizes and tires.
Thread Starter
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Joined: Apr 2022
Posts: 16
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From: Seattle, WA
GLE350
Need to also know the wheel offset (or ET value). The stock wheel offset is around 45. Bigger offset/ET number the wheel will be deeper in the wheel well, smaller offset/ET means it will be further out of the wheel well.
The 20x8.5 around should be OK, but check the ET/offset value on these wheels and check it on all 4 of them.
I think the tires will physically fit in a W213 but - 245/45 is a tire with 730mm diameter (109mm sidewall). The stock diameter on the W213 is around 680mm. This will make your speedometer off by about 7% (you will be going faster than what it is showing).
You can play with wheel and tire sizes here: https://www.wheel-size.com/calc/
There are number of other posts on the topic of wheel sizes and tires.
The 20x8.5 around should be OK, but check the ET/offset value on these wheels and check it on all 4 of them.
I think the tires will physically fit in a W213 but - 245/45 is a tire with 730mm diameter (109mm sidewall). The stock diameter on the W213 is around 680mm. This will make your speedometer off by about 7% (you will be going faster than what it is showing).
You can play with wheel and tire sizes here: https://www.wheel-size.com/calc/
There are number of other posts on the topic of wheel sizes and tires.
Ive search the forums but I dont see a lot about 20 tire size for square setup.
So I just found out the offset on the wheels Im trying to get(Vossen HF-3), per their website it shows +40 for their 20x8.5
Junior Member
Joined: Sep 2020
Posts: 46
Likes: 29
From: Charlotte, NC
E450 4Matic Wagon '19, MDX '09, 9-5 Aero '03, 280ZX '79, BelAir '57, VF700S Sabre '84
This is what 20" (8.5 front, 9.5 rear, ET35) look like, with 255/35R20 tires on both front and back (the rear tire looks more stretched on the wider rim).
Thread Starter
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Joined: Apr 2022
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From: Seattle, WA
GLE350
Those wheels with 40 offset will be fine. You may even look at spacers if you want them more flush with the fender (contact www.OtisIncLA.com). I am not sure about the tire with such large diameter. I would go with something closer to the OEM diameter, and maybe a bit wider. Consider 245/40 or 255/35, which are the recommended tire widths for an 8.5" rim (https://www.tyresizecalculator.com/c...rim-size-chart).
This is what 20" (8.5 front, 9.5 rear, ET35) look like, with 255/35R20 tires on both front and back (the rear tire looks more stretched on the wider rim).
This is what 20" (8.5 front, 9.5 rear, ET35) look like, with 255/35R20 tires on both front and back (the rear tire looks more stretched on the wider rim).
I happen to come across carid.com and seen the exact same wheels. As Im trying to build it, the only tires size they have as an options are 245/35. But 245/40 sounds more appealing with higher sidewalls.
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Joined: Sep 2011
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From: San Mateo Ca
06 CLS500, 07 GL450
I want to find out too i have 20" rims with 245/40/20 and 285/35/20. The offsets should work 35+ fr 41+ rear
Tires are from a c217 S550 coupe oem sizes.
Last edited by ydlee; Nov 16, 2025 at 08:39 PM.
