Re: 18-inch wheels to be introduced in 2021.
Posted: 06 Nov 2019, 12:48
Noon question here, will the teams like Mercedes who run their suspension very stiff be forced to run them softer and more forgiving with this new tyre profile?
Page 14 of 37
Re: 18-inch wheels to be introduced in 2021.
Posted: 21 Nov 2019, 17:32
I think a big aspect ( if not the biggest) will be the increased weight(7 kg each tyre). The larger mass will be a Problem for the dampers to react fast. Also, with the larger rim diameter, a pull rod on the front will be interesting again.
Re: 18-inch wheels to be introduced in 2021.
Posted: 21 Nov 2019, 18:04
+7kg, is it that much? It seems a lot to me. They only weigh fronts 9.5 kg, rears 11.5 kg atm afaik, and the fronts will be narrower and the tyres should weigh less. The rim part is the same and the axle part, it's only the spokes that have to be longer and thicker. Even without the savings, AZ80 alloy is 1.8gm/cc, so 7000gm is 3.9 litres of metal, which is a lot of spoke!
edit i see on Racefans last year Pirelli were estimating +4.5kg per corner, net. Still seems quite a lot to me but they ought to know. I suppose sidewall, that they're saving, isn't that heavy, but i didn't think magnesium wheels were that heavy either
Re: 18-inch wheels to be introduced in 2021.
Posted: 21 Nov 2019, 18:30
LMP1
Michelin tire (37/71-18) - 12.7 Kgs (without wheel).
2014 Michelin tires (31/71-18) - 11.5kg
F1,
Front 245/660-R13 - 8.5kg, Rear 325/660-R13 10 kilos.
Pirelli’s 2017 fronts 305/670-R13 - 9.5kg, rears 405/670-R13 11.5kg
Michelin tire (37/71-18) - 12.7 Kgs (without wheel).
2014 Michelin tires (31/71-18) - 11.5kg
F1,
Front 245/660-R13 - 8.5kg, Rear 325/660-R13 10 kilos.
Pirelli’s 2017 fronts 305/670-R13 - 9.5kg, rears 405/670-R13 11.5kg
Re: 18-inch wheels to be introduced in 2021.
Posted: 21 Nov 2019, 19:04
At a rough approximation the rim will be heavier in the ratio 18:13.izzy wrote: ↑21 Nov 2019, 18:04+7kg, is it that much? It seems a lot to me. They only weigh fronts 9.5 kg, rears 11.5 kg atm afaik, and the fronts will be narrower and the tyres should weigh less. The rim part is the same and the axle part, it's only the spokes that have to be longer and thicker. Even without the savings, AZ80 alloy is 1.8gm/cc, so 7000gm is 3.9 litres of metal, which is a lot of spoke!
edit i see on Racefans last year Pirelli were estimating +4.5kg per corner, net. Still seems quite a lot to me but they ought to know. I suppose sidewall, that they're saving, isn't that heavy, but i didn't think magnesium wheels were that heavy either
As well as being heavier these wheels and tyre will have a higher rotational inertia. With Pirelli’s 4.5 kg they’ll be 2% lower acceleration because of mass and possibly a further 1% from the inertia.
Re: 18-inch wheels to be introduced in 2021.
Posted: 21 Nov 2019, 20:16
perhaps that's where Pirelli got their 4.5kg from, on the rears. yes the rims get longer in circumference don't they, not stay the same weight as I'd been thinking. The spokes presumably go up more than pro rata and offset the axle weight not changinghenry wrote: ↑21 Nov 2019, 19:04At a rough approximation the rim will be heavier in the ratio 18:13.
As well as being heavier these wheels and tyre will have a higher rotational inertia. With Pirelli’s 4.5 kg they’ll be 2% lower acceleration because of mass and possibly a further 1% from the inertia.
that's quite a big effect you've calculated! But i'm looking forward to them anyway, depending on the hubcaps
Re: 18-inch wheels to be introduced in 2021.
Posted: 21 Nov 2019, 20:26
Re: 18-inch wheels to be introduced in 2021.
Posted: 08 Dec 2019, 11:18
Pirelli Tyre-test, waiting for some better pictures.
via Albert Fabrega
via Albert Fabrega
Re: 18-inch wheels to be introduced in 2021.
Posted: 08 Dec 2019, 20:30
Another shot
Re: 18-inch wheels to be introduced in 2021.
Posted: 08 Dec 2019, 20:37
Another shot. 
Made by George Russell.
Made by George Russell.Re: 18-inch wheels to be introduced in 2021.
Posted: 08 Dec 2019, 21:38
Big improvement imo 
. Are the F2 cars the same otherwise, next year? It'll be interesting to see their times if they are
. Are the F2 cars the same otherwise, next year? It'll be interesting to see their times if they areRe: 18-inch wheels to be introduced in 2021.
Posted: 08 Dec 2019, 22:19
I think it looks pretty good, just too bad they'll be covered up on the 2021 cars 
Re: 18-inch wheels to be introduced in 2021.
Posted: 08 Dec 2019, 22:35
How will the reduced sidewall affect the acceleration off the line? I would of thought the reduced side wall should reduce the creasing of the tire but would that increase mechanical grip?henry wrote: ↑21 Nov 2019, 19:04At a rough approximation the rim will be heavier in the ratio 18:13.
As well as being heavier these wheels and tyre will have a higher rotational inertia. With Pirelli’s 4.5 kg they’ll be 2% lower acceleration because of mass and possibly a further 1% from the inertia.
Drag cars use huge sidewall tires which crease loads but I can't say whether that actually helps or hinders them.
Re: 18-inch wheels to be introduced in 2021.
Posted: 08 Dec 2019, 22:45
I’m no expert. My expectation would be that the reduced side wall will reduce the deformation of the tyre which will reduce the contact patch length which in turn will reduce traction. This may be offset by lower tyre pressures. I believe that the “high” pressures required by Pirelli are due to the extreme cyclic flexing at high speed due to aero loads and the extent of the tyre flex. Lower tyre flex should reduce the amount of strain each revolution of the tyre.Maplesoup wrote: ↑08 Dec 2019, 22:35How will the reduced sidewall affect the acceleration off the line? I would of thought the reduced side wall should reduce the creasing of the tire but would that increase mechanical grip?henry wrote: ↑21 Nov 2019, 19:04At a rough approximation the rim will be heavier in the ratio 18:13.
As well as being heavier these wheels and tyre will have a higher rotational inertia. With Pirelli’s 4.5 kg they’ll be 2% lower acceleration because of mass and possibly a further 1% from the inertia.
Drag cars use huge sidewall tires which crease loads but I can't say whether that actually helps or hinders them.
Re: 18-inch wheels to be introduced in 2021.
Posted: 08 Dec 2019, 22:52
