Quote:
Originally Posted by lasitter
The report is old and the data is older. Until I see CRR data from different sizes of tires by the same tire maker / same class, I will remain unimpressed.
The CRR for every tire of every size should be readily available to us as consumers.
https://en.wikipedia.org/wiki/Low_ro...esistance_tire
"... 2003 California Energy Commission (CEC) preliminary study" ... some of this data may be 11 years old. I think it's a disgrace that we don't have better data, and the primary reason is that people who make and sell tires don't want us to have it. |
1) The fact that the data is old doesn't mean it is invalid.
2) That data is the only data that is available - and it is likely that there will not be new data any time soon.
3) And the data
IS of the same tire line - as best as I can tell.
So: "Bigger is Better"
But to answer the original question: Yes, a wider tread generally means more RR.
- BUT -
All other things have to be equal.
When you change tire diameter, you've changed more than just diameter. You also changed load carrying capacity - and load carrying capacity has a major affect on RR.
And as I point out on the web page: There are HUGE!!! differences between tires. Tire size is NOT a big factor in RR.
And while you may be thinking that measuring tread width gives you some insight into fuel economy, the material properties of the rubber itself have a much larger effect. In other words, measuring tread widths is enough information.