Atom 1 several questions, tyre choice, brake bias, radiator

[HenryJS]

c_a,

that doesnt sound right at all... winding the bias all the way to the rear probably isnt advisable as the rear wheels will lock before the fronts...

can you describe how the pedal / brakes feel?

it sounds very silly but you do need to really stand on the brake pedal as the brakes have no servo assistance (huge apologies if im teaching granny to suck eggs!)

Perhaps it needs new discs and pads and a good brake bleed?