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heavy, expensive tires, affect acceleration and the car wasnt made to run on 20s. the speedo will be off
Originally Posted by Gee_Whiz
Those are some very good reasons. Thank you for the feedback. Are we talking significant effects, like 10-20% reduction and calibration losses or barely noticeable changes?
Well, you can easily get 20" tires that will conform, vis a vis stock sizes so speedo/VDC ratio, etc. will work just fine.
255 30% 20 26.02 F
275 30% 20 26.50 R Alternate 1
285 30% 20 26.73 R Alternate 2
However 20s (both tire and wheel) are - as pointed out - typically going to be heavier. Suppose one could get into a formulaic discussion on how much an X% increase in unsprung weight negatively affects acceleration, handling, steering response etc.... but its far too early in the morning for me so if anyone is sitting their 7am AlgeCalc class and wants to solve a word problem, have at it.
Suffice that it is just "not as good" for the above purposes. But if you're not tracking or wanting to put too much to the ground, go for it if you like the look.
EDIT: Forgot to mention... I know nothing of the quality of those wheels but.... a lot of Mercedes guys (not me, thanks) seem to like them in 20, 21, even 22 for that baller look.
And that's enough reason for *me* to NOT run them.
On my Z with stock suspension I have
Front: 18x9.5+35 offset with 275/35/18 Nitto Invos
Rear: 18x10.5+22 offset with 295/35/18 Nitto Invos
Inner edges of the front tires were rubbing against the steering knuckle arms. I have tried 3mm, 15mm and 5mm spacers. 3mm wasn't enough to stop the rubbing issue. 15mm was the thinnest spacer I could find with builtin studs. But, it made tires stick out past the fender. Finally, tires cleared the knuckle arm with 5mm spacer. Also, 5mm seemed to be thickest spacer I could use without putting in new longer studs.
Outside edges of the rear tires were rubbing against the fender lip when cornering or going over large pot holes. I had to roll the fender lips to stop the rubbing.
On my Z with stock suspension I have
Front: 18x9.5+35 offset with 275/35/18 Nitto Invos
Rear: 18x10.5+22 offset with 295/35/18 Nitto Invos
Inner edges of the front tires were rubbing against the steering knuckle arms. I have tried 3mm, 15mm and 5mm spacers. 3mm wasn't enough to stop the rubbing issue. 15mm was the thinnest spacer I could find with builtin studs. But, it made tires stick out past the fender. Finally, tires cleared the knuckle arm with 5mm spacer. Also, 5mm seemed to be thickest spacer I could use without putting in new longer studs.
Outside edges of the rear tires were rubbing against the fender lip when cornering or going over large pot holes. I had to roll the fender lips to stop the rubbing.
You will be fine with the 15mm spacer , or just buy a 10mm spacer and install 10mm longer studs that will come with them
