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Remember all the times I've brought up how I change my bikes front brake to right lever? Engrained hand instincts from 40 years ago of right hand=front brake.
Years ago, a friend of mine was in the UK and on a whim bought a new Trek bike. We live in Wisconsin, Trek is headquartered in Wisconsin, not sure why he decided to buy a Trek in the UK, but he did and brought it home. We used to work at the same company and shared an office together, we were out having a few beers catching up life when he told me about his new bike.
Front brake on right, rear on left, that is the opposite of the norm for USA new bikes. He was in a huge quandary about what to do, was thinking of taking it to a bike shop to buy new brake levers or something like that. I told him to just swap the cables. He could not believe it was that simple until he thought about it for a few seconds, then it was time for another beer to celebrate how simple the job would be.