World Superbike bosses have today confirmed they will limit all teams to a single bike for the 2012 season and have changed the handicap rules for V-twins in the series but haven't said what they are.

The single-bike rule has been spoken about openly since the Silverstone round and mirrors BSB in the fact they will be allowed to have a rolling chassis in the truck with various bits not bolted to it. This also means flag-to-flag racing is dropped as you can't comes in to change bikes when it rains if you're riding the only bike you've got.

But the rules concerning the handicap to the 1200cc twins, which means Ducati's new PanicEarly, could prove interesting. In the past, the capacity difference has been made more fair by the use of air restrictors and an FIM stipulation which adds or removes weight depending on the advantage twins have over fours or vice versa.

The minimum weight limit for 1200cc bikes is also higher than the four-pot counterparts at 171kg. There has also been a ban on testing between December 1 until January 15 which explains why Aprilia and BMW are at Portimao for three days at the end of November. Supersport teams will be restricted to using only eight engines per year while Superstock are allowed just three.