EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 160; Flight Crew Total 1810; Flight Crew Type 260
Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Took Evasive Action; Flight Crew Landed As Precaution
Aircraft
Immediately after takeoff from ZZZ; I noticed a strong tendency to roll right. I trimmed the ailerons to fly level which required the roll trim to be placed 1/4 of the way to full left trim which is more than usual. I also noticed the controls felt a little lighter than normal.  Above 10000 ft and accelerating to 280 kts I thought the controls and especially the ailerons were much lighter than normal. I mentioned this to the Captain and he hand flew for a little and agreed it did not feel normal. He gave the controls back to me and he ran through a QRH checklist and I slowed to 200 kts and the plane flew more normal. After communicating with dispatch; we diverted to ZZZ1 and flew around to burn off enough fuel to get under our max landing weight. The approach and landing was uneventful.Because I was hand flying the plane during the climb; I noticed the unusually light aileron feel as well as the greater amount of roll trim required to keep the plane flying level. The Captain hand flew for a bit and agreed.
Co-Pilot reported problems with the aircraft not trimming correctly and diverted to another destination.