What you should expect is a sore butt. All that extra weight will be noticeable at the bike seat. Trust me.

Funny story.

One winter, for training. I tried a Bob Roll training session. I put 50lbs worth of barbell weights in a back pack and rode 30 mins to the base of a mountain and hiked up, came down and rode home.

I was badly bruised down there.....took weeks to heal.

The end.