I have run Goodrich G force sports on the rear.
Great grippy tyre with stiff sidewalls and great handling, much more stable than T1R's, but that's all academic since I have been told by several tyre places that like many good 225/50R15 tyres for an MR2 that were available in the past, they are no longer made. (But if anyone can find any, let me know and I'll immediately grab some).
 
I am afraid that some time in the future nobody will make that size in a road tyre, and we'll all be running R comps.

Reddtarga
Great grippy tyre with stiff sidewalls and great handling, much more stable than T1R's, but that's all academic since I have been told by several tyre places that like many good 225/50R15 tyres for an MR2 that were available in the past, they are no longer made.

 
I went looking for them after they were recommended, the website lists the 225/50R15 as a size but unfortunately I haven't found anyone that sells them, it's all 225/60R15 :(.
 

Gatesys
Bob Jane and gt champiros for the win :p

The tyres that came with the car when I bought it were GT Radial Champiro 50's and I had no real complaints about them! They did seem a bit noisy, but never had any issues in wet or dry. Another tyre that isn't made anymore and the successor doesn't come in the correct sizes.
 
After all this looking around, if I'm dead set on having the same tyres all round then I'm down to two tyres that are actually sold/can fit the car: Toyo T1R's and Falken Ziex 912. From what I read about both tyres before, I'm leaning towards the toyo's for an MR2.

Can I suggest Kumho's they have a large range, but you may need to have slightly different tread pattern between front and rears, but have a chat to you tyre dealer......I have recently acquired Kuhmo Ecsta KU21 for both front and rear and found them to be fantastic.......they are not a track tyre, but great for general driving - recommended. :-)

The downside of going to 17's, is that the ride will suffer compared to the stock 15's. Not so good if your car is a daily driver.
 
On a recent Vic MR2 Club run I checked the tyres on three different SW20's that were still running stock 15" wheels. When I asked the owners opinion about the tyres they were running they claimed not to have any problems.
 
One had Hankook K105's F/R
One had Falken 912's F/R,
One had Toyo T1R's F/R
I did note that they were all running the same brand front and rear, and although they all had 225/50R15 on the rear, I think at least one had a 205/50R15 front rather than the stock 195/55R15.
On recent checking I believe all those tyres are still available.
 

Hey guys, thread is a bit old now but I thought I'd post something to update now that I've finally got a new set fittled all around.
 
After all this discussion about the Toyor T1R's and it fitting with 205/55 on fronts. While talking the tyres guy in Penrith (CC Tyres), going through what was available for my car - turns out that Toyo does create T1R's that are 195/55! He said they might be getting discontinued though. 
 
Net Result:
2x Toyo T1R 195/55/15 on front
2x Toyo T1R 225/50/15 on rear
Total cost $690
 
How they handle?
No idea yet, haven't had a chance to actually try them out.

Hey guys, I've done about 1000 km on the tyres now and thought I'd check in and let you know how they're going.
 
P E T E - you were right with the floatey-ness after they first went on - felt pretty awful on the highway, like it could go any where with the lightest breeze. I had one moment when I went to change lanes after an overtake and the car went a little further than I expected across a little too quickly...
 
But, now that I'm about 1,000 km in I can tell that there is none of that feeling any more. I haven't gone through many tyres in total so I don't have much to compare it to, but these are certainly better than what I had before. They give me pretty good confidence while driving around in Glenmore Park (for those of you in Western Sydney, you know what I mean). Would love to track the car again to see how they go there.
 
Haven't had a chance to try them in the wet yet.

good work!
I have just fitted 205/45/16 kumho ku31s and 225/16/45 ku31s to my new super advans,
cost me 500$ in tyres fitted and balanced aha! I havnt driven alot on them, but i know from previous experience they are a very decent all round tyre, especially in the dry!

But my next purchase will most likely be YOKO NEOVA AD08 just because they are an AWSOME street and entry level track tyre!
once i can justify spending cash on tyres even tho i have just bought brand new tyres ahaha!

Good to see you got some good sized 15s, and good tyres at that!

I don't have any memory of going down that way, and if I had done with the MR2 I'm sure I would have remembered it. I never needed to go that far up as I was posted at RAAF Glenbrook.

Ah, to drive in real mountains again..........I do miss it!

The largest mountain range over here in the Perth area resembles a speed bump! LOL

Cheers, M