If you are tall enough to ride a 60cm bike then weight shouldn't be an issue for you.

To put this into perspective.

Let's take a 20lb bike:
- To a 135lb girl that would be 15% of her body weight.
- To a 175lb guy that would be 11% of his body weight.

11%:

- If a 135lb girl rode a bike that was 11% of her body weight, that bike would be 15lbs.

So, a 20lb bike to a 175lb person is like a 15lb bike for a 135lb person. That means, the bigger you are, the lighter things are to you...relatively speaking.