SPA-FRANCORCHAMPS, Belgium -- Tyre management is likely to be the key to success at the Belgian Grand Prix after teams and drivers have struggled to cope with the unusually high tyre pressures prescribed by Pirelli this weekend.Pirelli prescribes the tyre pressures ahead of each grand prix weekend, and since two tyre failures at the Belgian Grand Prix last year, those numbers have been enforced by the FIA to ensure tyres are not pushed beyond their limit. This weekend the pressures are set at 23.5 PSI at the front and 22 PSI at the rear, but several drivers have complained they are too high, resulting in overheating, blistering and high levels of performance degradation.The pressures are unbelievably high, McLaren driver Jenson Button said. Its amazing what we have to do to get these tyres in the working window. If you push on your outlap they are done by Turn 3 with blistering and overheating. What we have to do is crazy and Ive never had to do this before in my F1 career.Its the pressures, obviously its not helped by the temperatures, but we go to hot countries and I think Pirelli know that. Its a shame we are so high with the pressures because we are in a position at the moment where you cant push the car, you are just rolling around the whole time with the tyre.Pirelli motorsport boss Paul Hembery said the unusually high temperatures at Spa-Francorchamps this weekend -- which have been around 32-35C, but were slightly cooler on race day morning -- are also contributing to the high degradation levels.The high track temperatures have increased the wear and degradation rates on a circuit that is already very demanding on tyres, he said. Were expecting two or three pit stops per car, depending on degradation rates.But Williams head of vehicle performance, Rob Smedley, said the pressures are the key contributing factor to degradation, regardless of temperatures.If theres any talk about the tyres there will be certain quarters that come here and defend it because its unnaturally hot, but we shouldnt hide behind the fact that running 24 PSI round here gives us massive degradation, he said. The modulus [tyre compound choices] is slightly on the more aggressive side, but the pressures are the principle reasons why we are having high degradation. Its a simple fact and we shouldnt hide behind anything that might help out certain quarters.We were upwards of trying to bleed off 30 seconds on the outlap [during qualifying], which is not normal at all. But with the very high starting pressures that we are obliged to run, it means that on track, even on one timed lap, we are still well above 22 PSI and on the longer runs, without management, they can get up to 24 or 25, as we saw in Firday practice.Its an area of the tyre we dont usually explore. For us we are desperate to try and get the pressures down because there is more performance and we understand the tyres more at those pressures, so we can act accordingly. Its a problem for all of us.Lewis Hamilton has already made clear that he expects to struggle with the tyres as he comes through the field from 21st on the grid, with the challenge of following in another cars dirty air making tyre management all the more difficult. Two or three stop strategies have been predicted by Pirelli, but Hamilton could have an ace up his sleeve after saving three sets of brand new soft tyres for the race -- a compound designed to work in high temperatures, unlike the super-soft and mediums.Meanwhile, team-mate Nico Rosberg will start from pole position on the soft tyres after using that compound to set his fastest time in Q2 and has two sets of new medium compound tyres available for the race, as well as one fresh set of softs. The two Ferraris and Daniel Ricciardo will also start the race on softs, but the rest of the top ten must use the super-soft at the start, which is only expected to last a handful of laps. Wholesale Jordans Shoes Free Shipping . The team says the Spain international has a muscle pull in his right leg. Barcelona hosts third-division side Cartagena in the return leg of their round-of-32 tie after winning their first meeting 4-1. Cheap Jordans For Sale Wholesale .ca looks back at the stories and moments that made the year memorable. http://www.wholesalejordans.us/ . Reassurance came from Paul Tesori, his caddie and close friend whose newborn son is in intensive care in a Florida hospital. "Paul sent me a text this morning, just told me he loved me and wanted to go out and fight as hard as I would any other day," Simpson said Sunday after doing just that. Wholesale Jordans Cheap . Irving scored 23 points, Tristan Thompson had 20 points and 10 rebounds and the Cavaliers beat the Denver Nuggets 117-109 on Friday night. Wholesale Jordans Shoes China .Y. -- Marcell Dareus and the Buffalo Bills defence made life miserable for Super Bowl MVP Joe Flacco. Former five-star cornerback Kendall Sheffield hasnt been with the Crimson Tide for the past couple of days and his status is uncertain, according to Alabama coach Nick Saban.Saban told reporters on Tuesday in Tuscaloosa, Alabama, that Sheffield was in the mix to be the defenses third cornerback this season, behind projected starters Marlon Humphrey and Minkah Fitzpatrick. He said that the team would be happy to have him back.Wed like for him to be part of the program if thats what he chooses, Saban said.ESPN rated Sheffield as a five-star prospect coming out of Missouri City, Texas, in 2015. He committed to Alabama over Texas A&M, Florida State and LSU.Sheffields absence comes on the heels of the high-profile transfer of former Tide cornerback Maurice Smith, another native of Texas who followed former Alabama defensive coordinator Kirby Smart to Georgia.Alabama initially blocked Smiths choice of schools, citing an SEC policy against transfers within the conference. Last week, however, Saban released Smith and passed the matter along to the SEC, which granted him a waiver to go to Georgia, where as a graduate student he will be eligible to pplay immediately.ddddddddddddIn addition to Smith, several underclassmen have left the program since the end of last season, including Daylon Charlot, Adonis Thomas and Christian Bell.Speaking on the subject of transfers earlier this month, Saban said that he and the staff do not take an adversarial position against players who want to leave.Theres never been a player that has left this program that I havent tried to talk into staying. Not one, he said. Because I really do think its in the best interest sometimes of the player to overcome the adversity that hes faced with. And I understand theres a lot of pressure on these guys sometimes externally and they get a little fearful of their future and that creates a lot of anxiety and sometimes they think that changing their environment is going to help that. In most cases, I dont know if it does.Saban said that there is no cutoff date for Sheffield to return to the team. The fall semester begins Wednesday.Alabama travels to Arlington, Texas, to play USC on Sept. 3. ' ' '