F1 » Silverstone defends kerbs amid tyre crisis


BRDC president Derek Warwick says F1, its teams, the FIA, Bernie Ecclestone and Pirelli all need to take an inward look before blaming Silverstone's kerbs for Sunday's tyre failures.

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smpmatty

July 01, 2013 4:25 PM

Pirelli you are not doing yourself any favours.. trying to blame the teams about 2psi tyre difference and the track surface.. Atleast say you think it could be the tyres and if so will solve it no matter what a couple of teams say!!

Wolfy35

July 01, 2013 4:55 PM
Last Edited 442 days ago

Silverstone has not been resurfaced or had new kerbs placed since last year when the new layout track was first used for F1 & there was not a problem with tyres then.

Problem has to lay either at the construction of the tyres or at the teams themselves if what was said during the Sky commentary was true. According to the sky commentary Pirelli advised teams to run between 15 & 17 psi pressure in the tyres but some teams were running as low as 13psi. Lower pressure gives more grip but also allows sidewalls to run lower sometimes becoming an extension of the contact surface, If this happens the sidewall will give in fairly quickly.

benignlyindifferent

July 02, 2013 1:06 AM

Wolfy35,
I agree, having heard the same data from multiple sources now. The steel vs Kevlar carcass may have played a role in the severity of the failures, but it seems that under inflation was the primary cause for the failures due to the sidewall flex and curb interface. If the FIA are going to continue to regulate the tires to the degree they now are, perhaps they now need to place a minimum tire pressure regulation on the teams, just as they do for other important measurements. If everyone had been "properly inflated", I strongly suspect these failures would not have occurred.

Saintsman

July 02, 2013 8:52 AM

Clearly, if the kerbs have not changed, a more flexible sidewall on this years radial tyre as opposed to last years crossply could have been a significant factor.

While it looks like a bad kerb/green concrete interface - we all know they will take the best possible line with two wheels on the black unless the kerb is a severe deterent - but no need to make it dangerous, although no support race problems - are they all cross ply/stiffer tyres?

Wolfy35

July 02, 2013 5:16 PM

@ Saintsman

Last years tyres were not crossply they were radial the same as this years. What has changed since last year is last year the tyres had a kevlar belt under the tread where this years have a steel belt. The other change is this years tyres recently had a change to the tread bonding process in reaction to the delaminations that occurred early this season.

With regards to the support races interesting question & one that is answered easily. All the support classes use control spec tyres that are fitted, inflated & set by the tyre supplier at whatever pressure they reccomend. unlike the control tyre in F1 the teams can not change the tyre pressures they run what they are given.

The more information that comes out about these punctures the more it points to teams using less than recommended tyre pressures allowing the sidewall to roll more in the corners, these then wear quickly because they are not supposed to be a contact surface & eventually they give in.

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