If I want to replace the 17inch rims/tires on my 2004 4.7l with oem 20 inch tires/rims, will i have any problems with speedomter or gearing, etc... Let me know your thoughts or if you have made this change. Thanks.

 

Your speedo will be off if the tires on the 20's are a different height than the one's on the 17's. Also if you're going to a taller tire it will feel like you lost a little bit of power.

 

You won't notice a difference. I went from 17's to 20's ( aftermarket 20's thou with a 275/45/20 tire ) The size of my 20's with rubber were the same size overall as the 17's because the 17s run a taller tire. The oem 20's come with alittle lower profile tire then the 17s so u wont notice much difference. At least i didnt.

Just my .02

 

All in the issue of the overall height of the 20's+rubber that will determine if your speedo is off. If it's the same then no worries there. As chambers said you may notice a loss of power (off the line) due to the possible heavier wheels.

Anyone know if he'll have any braking problems, switching to a larger wheel combo ?

 

It doesn't matter (speedo) if you have 20's or 17's. As long as the over all diameter is still the same

33's on 20's and 33's on 17's will show the same on the speedo.

http://www.miata.net/garage/tirecalc.html

 

A tuner or the dealer can adjust the speedometer. Going from the stock 265/70R17 to the stock 275/60R20 throws the speedo off about 5%.

 

Hey I just bought a 2017 Charger SXT and, like you mentioned it has low profile 20" tires/rims on it. I was wondering, as you stated you converted from 17s to 20s, what the process is in order to do the opposite.... I am trying to reduce my wheels/tires to a 17" rim/tire.

 

You'll need to make sure they clear your caliper. Measure from the center of the wheel spindle to the edge of the caliper. Then double it. If that is 18 inches, 17's won't fit. You'll also need to check your off set so it clears the caliper there too. If it looks like it will fit, test fit a wheel like you want to see how it fits. Then you'll need to get higher profile tires so your speedometer reads correctly.

That's probably what the OP did 11 years ago.

 

11yr necro post and in the wrong section LMAO

 

do I need to change brakes and rotors?