Originally Posted by
Marcus_Ti
Smaller roller diameters correlate to higher rolling resistance. Which depending on your tire and riding style could mean more wear.
However with a fixed gear....I'd wonder about how good a workout you can get with larger rollers. Even my Performance Travel Trac rollers (85mm diameter), I need a medium high gear to get a workout (50x19+)...The Performance are frequently on wicked sale too (I landed mine for $100 or so).
50x19 is only 69.2 gear inches. Some of us that ride fixed, myself included, are in the 84/86 gear inch range. It would be a workout with that type of gearing.