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i ended-up having to get all the wheels of the car to get new tires mounted after all. so i raised the whole car.
a slight modification to the suggested process of raise at A, place stand at B, place stand at C, repeat on the other side: instead i used my ramps to hold up points B instead of using jack stands - looks much more stable and i don't see any disadvantages in my case (except that the ramps are not as portable for track days).
in general, i just realized, a potential risk is the difference in heights between the ramps and the stands, but in my case they are close (as far as i remember) when the stand is all the way down on its lowest setting. the angle (and thus weight) of the car may be slightly towards front or rear, but not noticeably in my case (and so i can't even tell/remember). i didn't think of this last night so i will check the difference better.
others have suggested using ramps as an intermediate step after which the car ends up all on the stands eventually anyway. in my case i left the ramps in place.
note this is only useful for when the car only needs to be raised slightly, as for removing all wheels since may ramp height does not give enough height to work under the car.
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