We’re all going to die. Some sooner, some later - and most of us sooner than we imagine.
IF the new bike is what you really want, and the price won’t put you out in the street or cause you to miss meals... do it.
Naturally the issue of domestic tranquility might be an issue, so there’s that.
Life is short. Fitness might improve both the quality or quantity of yours.
Or you might get hit by a truck.