Am I being mean?

I ride a scooter everyday to work, this particular co worker need for a ride one day , not too far really, the problem is that her weight probably more than 200 lb, and she would tend to ask for a ride everyday, i honestly worry about my scooter since it's only has 1 shock, i know I can't ask for her help if it's broken because i use it everyday, there re so many factors if it was, but if she's on it everyday too, i think she would be one of the factors, I don't want it to be happen, so i asked my other co worker who are lighter to take a ride with me so I don't have to feel bad about her, but somehow i feel i am mean...
Am I being mean?
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