Talk:Plus sizing

I can here for advice and can see that some clarification is requiered. The R designation followed by an number say R15 refers to the diameter of the wheel, not the diameter of the tire. Plus sizing changes the wheel size, and is NOT intended to change the diameter of the tire. If you change the diameter of the tire it might not fit in the wheel well of the car. Also changing the tire diameter would affect the speedometer of the car as well.


 * Nowhere the article says that plus sizing involves changing the tire diameter.

I came here to learn how the aspect ratio of the tire "the series number" the 60 in 205 60 R16 refers to the ratio of the tire diameter to its width. So does a 185 60 R15 have the same diameter as a 195 60 R15. This is refered to a plus zero change.


 * 185 60 R15 and 195 60 R15 have different tire diameters and IMHO it's not a plus zero change.

I completely agree with the last comment. I came here also to learn about aspect ratio. The article I found was not that but is also completely wrong. A larger tire would decrease performance, mess with spedometer, etc. A larger wheel (which is what is sized in inches in normal tire geometry) could increase performance, and not affect geometry if the tire diameter remained constant.


 * The last comments refer to plus sizing just like the rest of the article: to a larger wheel with same diameter tire. The mentioned disadvantages are related to plus sizing, not to a larger tire.

Aside from the already mentioned comments, this entry is rife with technical errors and subjective opinions


 * Please help by pointing them out.


 * To the two above contributors: If you can improve the article in any way, please feel fee to do so. We newed people like yourselves to inprove the accuracy of our articles.--SlipperyHippo 22:24, 19 March 2007 (UTC)

april 2008 changes
I've rewritten the article to make it flow a bit better and to deal with a few of the issues which were raised in the prior comments as well as correct some inaccuracies.

I've also moved the page to Plus Sizing since this is really what the article is about. Tire sizing is what is dealt with by tire code and that title sould really point to that article.

there are no references that heavier rims do not decrease acceleration, that wider tyres decrease acceleration, etc —Preceding unsigned comment added by 87.202.40.177 (talk) 21:55, 11 June 2010 (UTC)

Actual testing source
Car and Driver actually tested "plus sizing", and found results that conflict with opinions presented in this article. It may be a good source. http://www.caranddriver.com/features/effects-of-upsized-wheels-and-tires-tested — Preceding unsigned comment added by 68.149.1.64 (talk) 05:16, 3 February 2012 (UTC)