Scott Redding has warned that success in the Moto2 World Championship is now more about size than skill.
The Englishman made the claim after finishing seventh in Sunday's San Marino Grand Prix, where he was left frustrated by rivals powering back past him on the straights.
All Moto2 competitors use identical 600cc Honda-built engines, but there is no combined minimum weight limit for rider and machine.
UPDATE: The Marc VDS team have told Crash.net
that 19-year-old Redding is 185cm tall (corrected from 174) and weighs 70kg, rather than the 74kg stated on his MotoGP.com profile.
For comparison, title leader Marc Marquez is 168cm tall and 59kg, according to the MotoGP website.
The minimum weight of a Moto2 machine is 140kg. The smaller Moto3 category, where open engine competition is allowed, has a combined minimum weight (rider and machine) of 148kg.
“Every time I passed someone they'd just drive past me on the straight and I couldn't retake them in the next turn, because they had the speed that I was missing,” said Redding.
Official top speed figures for the Misano weekend seem to support Redding's claim. The Englishman was just 29th fastest through the speed trap, out of 31 riders, despite qualifying third on the grid.
Fellow Kalex rider Esteve Rabat (61kg) was fastest of all - 7.6km/h quicker than Redding - while Redding's own team-mate Mika Kallio (58kg) was third quickest and 6.5km/h faster.
“It's getting more and more frustrating now,” continued Redding. “For me it's stopped being about who's the best rider in Moto2, because physical size seems to be more important than skill.
“We need to find something to offset the disadvantage, and we need to find it fast."
Redding's Marc VDS team principal Michael Bartholemy is sympathetic, but can offer no obvious solution under the current technical regulations.
"Scott has been strong here all weekend but, once again, he was losing out on the straight in the race,” said Bartholemy.
"He's bigger than everyone else, and we're trying to compensate for that, but we're starting to run out of options.
"But, we need to do something ahead of the next race at Aragon, where the long straight is certain to cause similar issues in the race.
"It's not easy but then if it was, everyone would be doing it."
Redding has been linked with a move to MotoGP for 2013, but his only remaining chance of a manufacturer ride would be with Honda Gresini - all other seats having now been taken.