A friend of mine in Europe is getting me a set of OEM Mitsubishi 19' rims: 5x114.3, 8x19, ET 38.

I am thinking to have them as a second set for summers, replacing the current 18' OEM with A/S Goodyear tires for winter times.

1) What is the best tire size for the 19' wheel? (245/45/19 98W?) any good fuel consumption/mileage and long tread wear recommends?

2) Do I have to purchase another 4 sets of TMPS to install to each wheel? and does any TPMS fit for the Outie or have to go for OEM to get the on board display works?

3) These wheels don't come with any lug nuts, what is the right nut size should I buy? does the current 18' (5x115?, 7x18, ET 36? not sure these numbers) OEM nuts fit (or universal will fit)? or I have to look for OEM nuts for 19' wheel?

4) Do I need to purchase a "match" spare tire?

Thanks in advance for any inputs.

 

My best guess is that this is not a very good idea.

No idea what the "best" tire size is.
TPMS should be OEM
The differences in the wheel/tire diameters will be enough th throw off the speed sensors that feed the computer resulting in a loss of engine performance and the possibility of numerous computer trouble codes.
Lugnuts will have to be the same thread as the current 18" nuts, but there are several styles of seating surfaces-taoered,bulge, sleeved, to name a few. The seating style will depend on what the wheel looks like.

 

Thanks, Milliesdad....so that i need to order 4 oem TPMS from dealer? I have noticed the issue of changing the size of the wheel from others discussion, but looks like i am only upgrading to 'plus 1', i guess and hope the drawback is not that much......to the lug nuts, same thread as the current 18' nuts, means i can use the same nuts taken from the 18'? i don't know any of these current 18' nuts spec. so even I am going to look for it, still a problem, any ideas of the spec.?

the picture's wheels are what i am talking about. any other thoughts and suggestions, follow members?

 

The thread is 12mm x 1.50 mm (first # is diameter and second is pitch)

They look like this

 

Why not take the TPMS sensors out of the 18" and install them in the 19s? I run my winters without TPMS and they work fine.

The 19" will be fine and you don't need to worry about VSC or Trac problems as long as all 4 wheels/tires are the same. If they are original mitsu wheels they will have a center bore of 67.1mm and a 114.3mm x 5 bolt pattern. Offset will vary, but if they came from an outlander, they will fit on another one. 245/45R19 tires are almost exactly the same outside diameter (0.6% difference - less than manufacturer's tolerances) as the stock 16s (215/70R16) or 18 inchers(225/55R18). You can check things here:

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

I think those wheel look sharp, and as long as you're willing to pay for them, go for it.

Your stock spare tire will work fine with these as they have the same circumference as any stock north american wheel/tire combo.

 

Thanks,Claude_A, so I assume that I can reuse the current 18' rims set of 20 nuts for the 19' rims, or to buy a separate set of 20 of these?

 

Thanks so much TCP, you've touched upon almost all my questions.

If without the TMPS still runs well, and its easy to uninstall and reinstall, I can even save on another 4 OEM TMPS, and maybe the 20 lug nuts so that both set of wheels can share to use....

I went to the website quoted, and here's the return result:
Tire Size Comparison
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference 225/55-18 4.9in 13.9in 27.7in 87.2in 727 0.0% 245/45-19 4.3in 13.8in 27.7in 87.0in 729 -0.2% what does the difference here mean? -0.2% compare to what? does that mean, in order to run 1000 miles on each set of tires, the 19' will actually run 2 miles more than the 18' to reach the ODO 1000?

 

You can reuse the Nuts as long as the wheel web is close to the same thickness as the 18" and the hole is big enough to accommodate the nut shank.

Remember the studs are on the hub and they don't change with the wheel.

Also those wheel are located by the Hub spigot (the raised 67.1 mm disk in the middle of the hub) and the lug nuts only clamp the wheel to the hub.

Torque is 66 to 80 Lb-ft

Have fun

Also the .2% difference is negligible and within the wear limits of any tire don't worry about it.
Exactly (the 19' will actually run 2 miles more than the 18' to reach the ODO 1000)

 

As stated, the 0.2% is almost exactly the same as stock. completely negligable as even the same size tires from different manufacturers have a tolerance of up to 3%.