My wife and I both bought some entry level Specialized bikes over the weeked.

I got a base model Sirrus and she got the Crossroads. My tires are Specialized All Condition Sport, 700x32c and hers are Specialized Hemisphere, 700x38c.

When I we were riding on the road it seemed like she was working a lot harder than me to get the bike going. I assumed it was lack of fitness. The next day we rode again and switched bikes and I have to say I was working hard the whole time. I couldn't just ride and coast as easily.

I'm wondering if she switched out her tires if it would make a night and day difference on the tarmac. If that was the case I probably want to buy her a different set of tires.

Sorry if this is a beginner type question, it's our first bike other than the Huffy we rode back in grade school.