Hossier R750 Tire Test

[OldSchool+]

For sure.

But, speculation wise, why would they want a tire that goes away after two races, when the 750 is apparently close?

The only reason to make them the same would be so everyone in the pits could buy/trade/whatever tires back and forth.

I will guess--slicks look good on a modified, and they have kind of elevated over the years to almost late model status?

They always have been my favorite class since their inception. No offense to late models or sportsman cars, the mods just remind me of the open wheel stock cars I grew up with.

[OldSchool+]

Question (probably rhetorical) #2:

As has been mentioned, why would Hoosier develop a treaded race tire?

If it was goodyear, I could see the tie in with the street tires they sell, but Hoosier?

Rain is another thought, but nobody runs in the rain...

[shorttrackcar1]

owm94 your right always down to money my friend who races said he doesn't care at all about what they are testing. he will buy what ever they want to run and new tires every race.

[scottgarrity07]

It's not treaded, it's "ribbed". Straight grooves around the contact patch. I'm not sure why they do it. I have seen the same design on F1 tires, so there's some reason for it.

If I were an OWM guy, I wouldn't get too alarmed about this. L.J. Grimm tested these 750's the other day too. I'd call him or Jimmy Cope. I would think that they are testing, compiling data and would present it to you and let you guys make the call.

[scottgarrity07]

Here it is.....

[Patrick Thomas 25]

I love airplane tires.

You can almost see the grip in that thing.

Patrick Thomas 25

[OldSchool+]

Patrick--LOL!

When in Alaska the "bush planes" have tires that do almost look like that.
Saw one parallel a highway and take off in an incredibly short distance. Agressive prop, low top speed...

Scott--Doubt it is analogous, but I seem to recollect that F1 went to them to effectively reduce the amount of rubber on the road to limit cornering speed.

[scottgarrity07]

Bill Nye told me that the grooves create a thermal break in the contact patch thereby lowering tire temperature and reducing wear, much like siping tires does in dirt racing.

[8modified]

Governors Cup Modified race on Jan 24 we are running the F53, their are racers with tires from the original date per Donnie.

We will have the F750 50 lap tires on our car for the first practice at Showtime on 12-31-14 race. So we can see how they perform after setting for 2 weeks.

I will tell you that the fastest time we recorded was in the last 20 lap session and the times were the most consistent. The second fastest time was the 4th lap in the first session.

DJ did ask about this same compound in a slick and the response was they tested both type and found the grooved tire ran cooler and was faster with less dropoff.

[Matt Albee]

Looks like nobody else is sure why the groves are there on this tire either. I guess Hoosier really did have a new tire.
Put all classes on the same tire, Hoosier can drop the prices because they only have to develop, produce, ship, and stock 1 tire. Then, take offs can be used by every class.

[OldSchool+]

"Bill Nye told me that the grooves create a thermal break in the contact patch thereby lowering tire temperature and reducing wear..." -ScottG

Isn't it amusing how with one sentence everything looks different.

That makes perfect sense. Curiously, you would think that would be the case for every stock car tire. Perhaps, like the radial in Cup, they will all be soon.

Incidentally, (and apologies for my ignance) these are of belted construction, correct?

[luke81]

Scott--Doubt it is analogous, but I seem to recollect that F1 went to them to effectively reduce the amount of rubber on the road to limit cornering speed.

True. F1 ran the grooved tire for 11 seasons. They said it was to reduce the contact surface and slow the cars. It required harder rubber overall and it did suffer from higher graining because the ribs caused the tire to flex and deform unevenly across the tread. It also allow for slightly more stability in situations where the track wasn't wet enough to switch to intermediate tires but not 100% dry either.
I have no idea if any of that would matter at all in this case. I'm just an F1 nerd.

[owm61]

You no we have been down this road before, we have all heard the bullshit about how much yur going to save the racer lmao, we finally get the whole state of fla on the f 53 for mods,I've seen some great racing lately on the slicks in the mod class,i cant speak for the sportsman cars or the trucks cuz I don't own one if yu drivers want that type of tire great,but I've yet to see a mod driver bitch about the slick, whats next latemodels going to a grove tire to,It aint broke so why you trying to fix it,drivers are going to buy tires regardless, I was told that after march the f53 will not be around good luck drivers I hope it all works out for ya, BTW I STILL HAVE A BAD ASS CAR FOR SALE,

[UREZ2PASS]

The grooves in the tires are designed to help cool the tire.

The edges of the grooves create additional traction. The more grooves the more edges to grip the track. However, there is a loss of available rubber meets the road with each groove in relation to the width of the tire.

A grooved tire with the same contact patch should out perform a slick of the same compound. The grooved tire would have to be the total width of the grooves wider than the slick.

[scottgarrity07]

Hot damn, EZ! Bill Nye was right after all. I've heard that the contact patch on this new 750 is somewhat wider than the grooved 650's and 450's that we've run up to now. Maybe that's why the 750 seems to have all the grip of the softer tires but punches harder on the durometer.