Quote:
Originally Posted by RedDevil
Not to be pedantic, but:
1.1% is way less than 1.1", if your wheels are less than 8'4" tall. 
In either case the sidewall on the 18" rimmed tires will be much narrower, so if it has to flex the same distance it will bend much sharper, and that's all extra friction. |
Sorry for my shortness. 1.1% is correct which makes sense. The scenario I tried was 6% larger tire on 17” rim,about 11 kilos lighter total. I can see how low profile tires can work but usually the weight offsets the gain.