Hey guys,
I just got new tires (Michelin MXV4) put on my 11' G37x and I had them do an alignment as well however, I noticed when performing a harder brake that my rear feels like it's fishtailing a little. Anyone else experience this when putting new tires on or know why it might be happening?

Did they perhaps do the alignment wrong or something? Not sure if it's a coincidence or related at all or not but I do need to get my rear brakes done... (at least according to the tire shop I just went too...)

 

they may need to break-in a little. I think they usually have some thin coating on them but rear fishtailing on braking doesn't sound right.

 

Haven't had the tires firsthand but it appears they're not really designed for higher HP vehicles, here's the summary on Michelins' website~
Perfect for Comfort-oriented touring vehicles such as Honda Accord and Toyota Camry, this tire delivers all-season traction and a safe, Comfortable ride backed by a 60,000-mile limited warranty

Rubber compound might be a bit harder giving you the high mileage rating but sacrificing traction. What speed rating did you get?

 

My fiance has them on her accord, they're definitely not performance tires, sidewalls are very soft and the compound is hard. But even still you shouldn't be fishtailing while braking unless you're slamming the brakes on hard.

Might try pushing your parking brake to the floor and letting it out again, could have gotten stuck somehow, doubtful but if it's slightly engaged it could be causing the issue.

 

Also make sure to check the tire pressures. I bought some news tires once for my previous car and when driving home I knew something didn't feel right. The (rear) tires were set to 45psi+ and these were performance tires that were supposed to be 32-34psi.

You could feel that the back end could fishtail out much more than normal!!!

 

Hhhmm a few ppl on here and a few other sites (nico and tirerack) reported good results with using these michelin mx4v's on their g35/37s.. and the tire sites and manufacturer do claim it works good with the car. (I spoke with both a tire rack and michelin rep and they both claim its supposed to work well and is the ideal michelin tire to pick for good all season performance) so I feel like the tire should at least drive correctly...

I'll check the pressure when im home later. Could my worn down rear brakes be the cause perhaps? I noticed they squeeled a little bit the last week or so but ever since the tire place changed my tires theyre REALLY squeeling now! Like I heard a slight squeel once last week but after the tire change they're squeelin non stop!! Why would changing the tires cause that!

 

The only thing I can think of in relation to the tires is that the softer side walls are letting the front of the car dive a bit more, thus transferring more weight to the front end and reducing the amount of relative grip available to the rear tires... I somehow doubt that this effect would be substantial enough to be noticeable.

As SkylineEX-S has mentioned, tire pressure can also affect a car's balance so that might be the easiest place to start.

 

What tires did you remove? If they are a higher performance (stiffer, stickier) tire then what you feel may be normal. I removed a set of Michelin PSS and replaced them with MXM4 on my wife's car. Huge difference. She didn't like the PSS ride quality or tread wear. But performance and handling wise its an enormous downgrade. But she's happy.

They are OK for getting more miles from a set and probably better in cold temperatures and light snow, but they are far from a performance tire.

 

There's a big differenence between the Primacy MXM4 and the MXV4.. The reviews I think you saw on Tire Rack are for the MXM4..The MXM4 of which I just put a set on my car this week are outstanding in every parameter.. No they aren't the Pilot Super Sport, but the G isn't a 911 either.. In any case tires do require about a 500 mile break in before they are 100% at least that's what Tire Rack and many other respectable industry sources mention..

 

Im coming down from the stock goodyear tires. Their grip seemed ok in the snow and tread life was pretty bad with them.. though they did drive well in normal weather. I was hoping to find something that handled almost as good but had better bad weather performance and thread life. When I spoke to both a tirerack and michelin rep they both separately claimed the mxv4 was supposed to be a good balance between sporty performance and weather handling... but perhaps that claim isnt so true... I checked again and saw people saying this tire was good on the g on tirerack...

I checked the air pressure... idiots had it inflated to 41psi... I dropped it down to 33 and did notice an improvement! Something still feels a little off tho... I mean I dont see the back end fishtailing it just feels like something is moving sideways slightly back there.

Also, I dunno if im going crazy but it feels like the car takes longer to accelerate now. Or perhaps its that im not feeling the jerk of shifting gears as much?

 

My experience I had with some Yokohamas are if they are lousy after 50 miles and any oil or grease that could be on the tire for shipping and storage is gone, they will be lousy for the remainder so either try and go back to the shop and see if they will exchange them imor try a different tire.

 

There are definitely stickier tires for our cars. How much bad weather do you get where you are? I tried to find a good compromise for all weather performance with several different tires making similar claims. It finally dawned on me that we only drive the truck in bad weather, so I should stick with performance tires.

 

I replaced my stock tires with the MXM4 about 5 months ago and they are really good, no complaints so far.

 

MXM4 and MXV4 aren't even close.. If you bought them from tire rack I'd exchange them for either the Primacy MXM4 or the Pilot Sport AS/3 You didn't mention but you have the 17" wheels? The Bridgestone Turanza Serenity plus is also an excellent tire...