Great Cobra Tires

[mdross1]

Certainly have to get serious about new tires for our car. They still look fantastic but certain the rubber is turning into a different material after 20 yrs.
No bias tires for this cat only sticky 15" radials.

[YerDugliness]

My BFG's are 14 years old......sure glad I have survived driving them!

I am having trouble getting tires for my size application...think mine are 295/50 R15 size. The M/T SRs are sized in a different manner...but I think the 29X12/15 SRs would be about right if the first number is tire diameter and the second is tire width at the tread.

Does anyone have a size comparison chart between the two rating techniques? My replica is currently in winter storage and it's a fairly lengthy trip out there just to measure the diameter of the tire.

Thanks!

Dugly

[csx4017]

295/50R15 = 26.6x11.6R15

[YerDugliness]

Thanks for that!

You know how you come across those trailer mounted radars every now and then that shows the posted speed limit and your current speed? I seem to get readings on current speed that are about 10% lower than my speedometer reads, so I would like to go to a bit taller rear tire to regain some of that speed and make my speedometer more accurate. Now to figure out the corresponding diameter/circumference issues, time for a calculator!

I see lots of sites carry the 28X12/15 and the 30X12/15; but, not so many carry the 29X12/15, only a few do. It all seems to be related to rim width, but I can't seem to make any sense of whether it is minimum rim width or maximum rim width. All of the sites that carry those tires list them as "LT"...does that mean "Light Truck", as in perhaps SUVs?

Gotta do something about these BFG's....like riding on ice at times, the rubber is so hard!

Cheers!

Dugly

[Shootnride]

Originally Posted by YerDugliness

I see lots of sites carry the 28X12/15 and the 30X12/15; but, not so many carry the 29X12/15, only a few do.Dugly

Dugly,

I have been running the 28x12x15 MT/SR's on my SPF for about 18 months. They are about all the tire you can stuff under the fenders on a SPF, so you may want to reconsider using anything larger. I have actually just changed them to the 295/50R15's. I liked the SR tires a lot, but was never satisfied with not being able to lower the ride height to where I wanted it. MT does make that tire in a 26x12x15 which a lot of guys use. You can get on MT's website and get all of the dimensions for their tires.

Ted

[RallySnake]

Dugly,

Bigger is not always better. I ran a bunch of 295/50/15 rear tires on my car before I tried 275/60/15's. They are slightly taller which should help your speedometer problem. They also fill up the fender better. But the important thing is the controllable transition into a slide. The 295's hold to a very high g load but when they let go, it's pretty sudden and hard to catch. The Mickey Thompson S/T's give warning at the limit and let you push the slide as much as you like. However, like all tires, they get harder as they age. Mine are about 5 years old with about 3/8ths of the tread left. On a recent track day, they were Ok but didn't have nearly the grip they did when new. About time for some new 255/60/15's on the front and 275/60/15's on the rear. Right now, for general purpose and some track time, I don't think any other tire is as good, unless you can afford the Avons ($1,600). Note: the Mickey S/R's are made with a harder compound rubber.

One other thing. It is surprising how much wind resistance wider tires have. When running at higher speeds, the 295's have much more drag and you have to use more power (and gas) to maintain the speed. Of course the smaller diameter requires more RPM also.

RS

[Shootnride]

Originally Posted by RallySnake

Note: the Mickey S/R's are made with a harder compound rubber.RS

Having had both, I'm pretty confident that the opposite is true.

Ted

[RallySnake]

The MT Tech Support person says the S/T is softer, not me.