Discussion in 'NASCAR chat' started by DanicaFreak, Nov 22, 2019.
It'll be a sad day when the 15's die.
We've known this for a while now. In fact, the article you posted is from August.
Thanks good to remember though.
trying to keep organized a bit instead of have numerous threads about the same thing if possible
I think the 18" tire is more than thread-worthy.
If you follow along with the mechanical stuff, this is a game-changer.
a bigger tire should increase gas mileage right? Reduce transmission RPM,,,
The circumference of the new tire will be the same as the old ones - give or take an eighth of an inch.
The difference is in the aspect ratio and because of that, the spring rate.
I care more about the composition of the tire than wheel size, make it wear down sufficiently over the course of a green flag run.
^^^ Wear that rubber OUT!
I wonder what the rate gain will be at the same air pressure? Of course I'm assuming gain in the rate instead of losing considering the sidewall will be a couple inches shorter
Good question. Test, test, test.
Yes, the spring rate of every tire will increase.
With the increase in the tire rate they probably will be running bicycle springs under these things before too long.
I remember my dad telling me that many years ago
I don't care if they run 15" or 18" tires. I just want to see some more tire wear and short pitting becoming more of an option. I think that is the best way to create more passing and (imo) it definitely makes the various race strategies more interesting.
I wonder if there will be more issues with breaking the tire bead. I also wonder if the wheel and tire becomes less tolerant to contact due to a shorter sidewall.
I assuming the 18" wheel and tire assembly will weigh less than a 15" assembly? If true wouldn't it essentially represent a small HP gain, and less wear and tare on the drive train, suspension, and brakes?.
If the wheels are steel, I’d say the 18” combination would weigh a little more.
And I wonder if a larger wheel with more mass will heat slower during braking, reducing the chances of the bead melting.
Assuming NASCAR doesn't allow the teams to just fill up the new found space with ever larger brake packages, the larger wheel theoretically would move the bead further away from the heat sources.
Maybe I'm all wet, but I'm assuming the new wheel WON'T be steel, which I fully support, especially if they go to the single nut system, which I could not be more opposed to by the way.
My guess would be fewer sidewall cuts from body contact (the new body may take some of that away anyway) but I would expect wheel more damage, although it doesn't seem to be a big issue in other forms of racing. Theoretically, the short sidewall would not like curb and rumble strips as well, but once again, it doesn't seem to effect other cars that much.
I think that is going to be a HUGE deal, maybe as big as the changes to the car itself as far as chassis setups. One would have to think that teams that have in house knowledge of Indy cars and sports cars like Penske and Ganassi could have a big advantage, at least early on. I wonder if some of the other teams won't have to leverage some outside resources (Chevy teams could work with Pratt and Miller for instance) to get up to speed quicker.
I'm not very optimistic it will make much of a difference. Rocks are rocks. I expect to see even longer runs for the tires and tires being less of a factor going by Goodyear's history of doing so while telling everybody the tires will have fall off.
I think because of the sidewall difference, I think it's going to be back to square one on setups. I have no clue whether this will be a good thing or a bad thing, just that I expect it to be a LOT different.
Less of a factor than this year? May God have mercy on our soul.
yeah for sure. I'm no tire expert but less sidewall means less flex. The prototype was running a wider tire also on the rear. Couple that with hard compounds Goodyeer characteristically uses, I can't see tire fall off being greater than it is now but less. Traction should be better
How so? The caliper will remain consistent
I think more tolerant, less target if you will.. you are more then likely to contact the wheel instead of the tire considering a 2 inch loss in sidewall
Im thinking Carbon fiber
If NASCAR allows the teams to run a larger rotor to take advantage of the larger wheel, the caliper will end up just as close to the wheel as it is now.
Okay, there's one of the 'IF's I was looking for. I mostly wondered if a bigger wheel would have more mass to spread the heat across and more surface area available to cool, taking longer to heat up to melting temp. But then I'd also have to factor in whether they change the material, and whether the new one would heat faster or slower.
So many questions on this one. I agree spinning it off from the main 2021 discussion was a good idea.
Thats what I said, the caliper will remain consistent and I havent heard anything about larger rotors
I haven't heard anything either, but if left with the option, the teams will likely make use of that space, and if the rotor gets bigger, the caliper will too.
Why would they want to add unsprung weight?
for better more precise braking. Unless Nascar has a rule, knowing teams, they will have a different brake for every track and a different spindle for the front end.
^ like they have now?
You're gonna add weight for better braking? The calipers and rotors and brake pads they have now could stop an airplane.
Well, just for perspective, the Corvette C7R race car uses 14.8" rotors up front and 14.0" rotors out back (steel by rule) along with the HUGE calipers and pads that go with them, and those cars weight a LOT less than a Cup car and have more downforce, meaning they should be a LOT easier to get stopped, but yet they are willing to sacrifice unsprung weight for braking capability. I would imagine at tracks like Martinsville, Hew Hampshire, Phoenix and Sonoma, many Cup teams would too.
not sure about weight, they have carbon fiber or ceramic brakes these days on street cars. You can buy them from your local AutoZone
Im sure the cost of a carbon fiber braking system wont excite the owners, I'm all for carbon fiber wheels to offset the unsprung weight
I have no idea what the rule book says in that class. You say steel rotors are required so are the the rotor size and caliper type also?
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