A 50 series tire is shorter than a 60. The first # 245 is the width.
See 245 or the 1st # is the width of the tire in M.M. I think ? But the 2nd # is the height to width ratio meaning that the tire is 50% as tall and the tire is wide or 60% or whatever the 2nd # may be. And of course the last # 15 is the rim size.
I also have Rally II's in a 15" Stock offset and have 225/50/15's all the way around with no problems on my 67 drop top.
And have some room to spare. I know many who run a 235 or 245 in the rear on 67/68's and are ok.
I think it would be a good idea if you ran say a 225 or 215 in the front if you are at all worried. I've always liked the 50 series just for the fact that it has a stiffer sidewall and usually is more responsive in cornering... even though I don't drive as hard as I used to... (And haven't had a ticket in many years) Hmmm? I wonder if there is something to that?... Naw....
If you were going up to a 17" or 18" wheel, I'd sweat the details, and tripple check the specs, but on a 15" Rally II, you should be just fine!
Show us some before and after pix when you get them on!
Mine are the Euro Radial TA's... but I would think if you had a store like Discount Tire or the Tire Rack etc locally, you would be better off stopping by and have them look up the tire. I know they are avaialable... everyone has them and everyone uses them in the standard BFG Radial TA. Has to be one of the most popular tires around. On line it seems that your choices are limited, but at a local store... they can get just about anything!
Thanks Greg, it's come a long way, and has a long way to go... but don't they all?