Tire Size Questions??

**06TB2066** · 09-17-2009, 09:52 PM

My father in law has a 2006 300 Hemi C. Currently he has the stock Conti's. 225/60R18's.

He wants a Michelin Tire. The only exact replacement is the Primacy MXV4 however the sales guy said he could try the HydroEdge (because he wanted a higher milage tire) but it only comes in a 225/60R18 which is almost a full inch shorter. Would he have any issues with the computer if he installs a tire that is an inch smaller in diameter?? He is not looking for performace as much as a decent quiet ride? Would the Primacy be better?

**richierevs** · 09-17-2009, 11:11 PM

Originally Posted by 06TB2066

My father in law has a 2006 300 Hemi C. Currently he has the stock Conti's. 225/60R18's.

He wants a Michelin Tire. The only exact replacement is the Primacy MXV4 however the sales guy said he could try the HydroEdge (because he wanted a higher milage tire) but it only comes in a 225/55R18 which is almost a full inch shorter. Would he have any issues with the computer if he installs a tire that is an inch smaller in diameter?? He is not looking for performace as much as a decent quiet ride? Would the Primacy be better?

Having an inch difference in tire height he's close to having a problem with the HydroEdge without being able to adjust the tire height with a Predator. I would recommend the Primacy and keep the PCM/ECU happy.

**Edit**

Additionally, he can look at alternative brands like Toyo which are comparable to Michelin without the price tag.

**06TB2066** · 09-18-2009, 06:28 PM

Originally Posted by richierevs

Having an inch difference in tire height he's close to having a problem with the HydroEdge without being able to adjust the tire height with a Predator. I would recommend the Primacy and keep the PCM/ECU happy.

**Edit**

Additionally, he can look at alternative brands like Toyo which are comparable to Michelin without the price tag.

That was my fear. Thanks.

**FloridaRT** · 09-18-2009, 07:26 PM

A 245x55x18 tire is the same height as the stock tires......................

Bob

**richierevs** · 09-18-2009, 07:34 PM

Originally Posted by FloridaRT

A 245x55x18 tire is the same height as the stock tires......................

Bob

Just curious, how wide are the stock 18" rims? I imagine 245s would have a nice sporty look on those rims.

**06TB2066** · 09-18-2009, 09:00 PM

Originally Posted by FloridaRT

A 245x55x18 tire is the same height as the stock tires......................

Bob

He is pretty much set on Michelin and they don't have that size listed on their website.

**2005rtmag** · 09-18-2009, 10:16 PM

The stock rim is 7.5" wide. The 225/55x18 will not have a high enough load rating. A 235/55x18 is a possibility. I just ran my Michelin MXV4's in that size over 40k miles and they gripped and handled worlds about the stock contis.

**06TB2066** · 09-18-2009, 10:36 PM

Originally Posted by 2005rtmag

The stock rim is 7.5" wide. The 225/55x18 will not have a high enough load rating. A 235/55x18 is a possibility. I just ran my Michelin MXV4's in that size over 40k miles and they gripped and handled worlds about the stock contis.

225/60 has a rim width range of 6-8" according to the website. 225/60 is his stock size on his 300C.
235/55/r18 is what I have on the Daytona and I was thinking of telling him he could use that size also , (I think his 300C would look better with the lower profile too). However the Primacy MXV4(225/60 only) seem to have a higher rating than the Energy MXV4(235/55 size only). The Primacy also has a higher tread rating (which he is looking for) The 235/55 would probably handle better though. He is a spirited driver but is not looking for performace oriented. More quiet, smooth and long lasting.

Thanks for all the input he will have a decision to make

**2005rtmag** · 09-18-2009, 11:08 PM

He can't go wrong with either the 225/60 Primacy or the 235/55 MXV4 Energy tire. However the 235/55 is a little shorter than stock.

In your original post you must have made an error because you posted 225/55 Primacy.

**06TB2066** · 09-18-2009, 11:33 PM

Originally Posted by 2005rtmag

He can't go wrong with either the 225/60 Primacy or the 235/55 MXV4 Energy tire. However the 235/55 is a little shorter than stock.

In your original post you must have made an error because you posted 225/55 Primacy.

Yer right, fixed now, Thanks. I'm confusing enough without the typo's

Yah I think he'd be happy either way too.