I have Alex TD24 rims with slick tires that are 1.95 thick. I'm wondering if dropping them down to a size 1.75 would make a difference in terms of rolling resistance? The lowest I can go with these wheels are 1.75. Would it be worth it to change to this size or should I just stick with 1.95? If you can also give any suggestions as to what brand tires are good that would be great as my current ones are fairly old.