New Car Tires?

The "89" and "90" are the tires "Service Rating" or "Load Index", which indicates the load carrying capacity of the tire. The "V" is the speed rating, which indicates the maximum speed the tire can attain under a specified load for a specified period of time (the details of which are too long to get into here).

Both tire sizes have the identical speed rating and as long as that rating meets or exceeds that of the OE tires on your car you are fine. So why are the numbers different?

The 90V's probably conform to "Euro-Metric" design standards where the 89V's probably conform to "Passenger-Metric" standards. I'm guessing on this though because you did not give the complete size. These systems use slightly different load and inflation tables on otherwise identically sized tires. But according to the RMA "The Load Index may not be used independently to determine replacement tire acceptability for load capacity." Here is where it gets complicated.

As an example, a P205/55R16 89V tire (which we know is Passenger-Metric because it has the "P" in front of the description) at 29 psi can carry a load of 1,157 lb. A Euro-Metric 205/55R16 90V (no "P" in the description) needs to be inflated to 31 psi to carry that same load. At 34 psi however, both tires have an identical load capacity of 1.257 lb.

The P-Metric tire has a maximum load of 1,279 lb at 35 psi where the Euro-Metric tire has a maximum load of 1,323 lb at 36 psi however. And the Euro-Metric tire is likely to have a higher "maximum" inflation pressure (up to 51 psi) where a P-Metric tire will have a maximum inflation pressure, depending on brand and model of 35, 41 or perhaps 44 psi. Most high-performance and ultra-high performance tires with high speed ratings tend to be Euro-Metric for this reason. At high speeds you may need to run higher inflation pressures (another long story).

Long story short, you may need to adjust your tire pressures very slightly but otherwise these tires should be fine.

ASE Certified Automotive Service Advisor

aH..... Thinking of going over to the Dark Side you are. Automobile tires are made with a much stiffer rubber. They have a flatter profile. If you ride mostly upright and put 20,000 miles or so a year on your motorcycle you may consider crossing over to the Dark Side. With an automobile tire you will get many more miles out of the tire. The cost, there is *always* a cost, is that you will have relatively pitiful handling. A motorcycle tire, in a turn, keeps a large contact on the road. A car tire, in a turn, will lift most of the tread off the road and you will be riding on just the edge corner of the tire. You lose a lot of cornering traction. But if you don't push it, don't lean far in the wet, you will most likely be OK. If I had a touring bike that spent 99% of it's time upright on the Interstate I would likely be on car tires. Instead, I ride city, regularly scrape pegs, ride in wet, over painted lines and steel manhole covers. I don't give up my safety to save a few bucks on a tire. I run Metzelers.

Hi,

Dont worry nothing big difference will come.The main aspect you shud watch is that the tyre size like 225/50 R16 89 v

where 225 means the width of the tire in cm

50 means the width/height ratio

R16 means the the diameter of the disc is 16 inches

89 denotes the Load index

v denotes speed symbol\

Pls refer to the link which I have given below which wil give you a complete information in the tire.

I think you need to verify it with your nearer garage....!!!!

You will get better info from them but they should be authenticated...!!!

89's and 90's are differ from each other. while "V" indicates speed.

But as per my opinion you need to recheck it again and also verify with car tyre experts like mechanic and car tyre agencies.

no bid deal as long as the back 2 are the same

and same 4 the frunt

you should replace all just so their all evenly worn and if your going to obsess over it change em.

No big.