Jonathan Rea set an impressive pace on Friday afternoon at Aragon as he sped to the fastest overall World Superbike time of the day.

Rea ended the session 0.145s faster than team-mate Tom Sykes as he looks to continue in the rich vein of form that has brought him three wins from the first four races of 2015.

As Rea's Kawasaki outfit adopt a new electronics system for the start of the European season, the 29-year old stated he feels "not so much difference" between the bike he rode to a double victory in Thailand and the one he took to first place on Friday.

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"For me there's not so much difference," he said of the electronics changes on Friday evening. "I don't know what was happening in FP1 but I wasn't getting any lap times. The bike wasn't performing like it should. Then also we've been developing the last few weeks with David Salom in Spain the gearshift light. Normally I have one flash but this one was a build up and then a flash. So it wasn't a wasted session but we needed time to work between to get everything right."

Along with Tom Sykes and Chaz Davies, Rea was the only rider to dip into the 1m 51s bracket on Friday afternoon. However, unlike his rivals, he backed his time up with a succession of laps in the low 1m 52s.

Rea went on to reveal his early season form is a result of finding the optimum riding position on the ZX-10R.

"Together with Pirelli we work really fast to get a good base setting. We have an idea more but it's hard to do that without getting lost. We're just working slowly. We're not making any big steps because we're already in the ballpark. But we have some good ideas to let me ride the bike how I want.

I had to be smart, quick and clever to adapt so fast. I knew the package was going to be strong. I spent days and days to find the right seating position. I'm probably feeling more comfortable on this bike than I ever did on the CBR."