Originally Posted by kudelt07
As I mentioned before, the change in rolling radius (for a larger tire) will decrease the braking force at the road.
Do you happen to have a quick explanation or a link to something that explains this? My brain is refusing to grasp this concept (granted it is late) but I don't want to derail
this thread with a physics discussion
The things that seem to be keeping me from grasping this:
- I have seen way too many people say that the unsprung weight is a big deal to readily accept how you dismiss it as not mattering in regards to braking. I am not an engineer or an expert mechanic though, so I ask questions.
- Also... bigger tire (to an extent) = bigger contact patch (more on this in a second) = more friction/traction area = better braking? Unless... Are you are just saying that keeping width equal, a smaller radius tire has better braking action? (which isn't quite the same as the unsprung mass concept, even though the unsprung mass would be less in a smaller radius tire)
Not tracking this AT ALL.
I did have a few other things to mention...
Looking at the generic sizes and what those are supposed to yield is one thing. Make sure you are also checking out tread width as well. I was also looking to see if there were contact patch gains to be found in changing up tire sizes. I noticed that an increase in size does not always yield a bigger tread width. (sadly, tire rack does not always list tread width for every tire)
Here's the first example I could find (tread width is in bold):
Continental ExtremeContact DW
275/40ZR17 25lbs 9-11" 10.2"
285/40ZR17 27lbs 9.5-11" 10.2"
So, in this case you add 2lbs per tire, raise the car .15" and have esentially the SAME amount of rubber meeting the road (maybe .1" more do to the increased circumference).
I have seen this on several lines of tires. Knowing how the tire molding process works (thank you so much "How It's Made"), I am gonna guess that some companies reuse the same tread mold for different sizes.
It's just one more thing to check when looking for tires
Originally Posted by MCW Sky
I say wow becuase those tires are speced for 10.5 - 11.5" wheels - compared to stock tires fitting 7.5 - 9.5" wheels. While I am not saying that you cannot get a tire to mount on a wheel outside the defined range - you can end up with problems with the sidewall and load and rolling friction etc.
Those Hoosiers are just racing slicks in disguise
They're stupid soft and insanely sticky with some groves cut into them so they can pretend to be "street legal"
If you look around the threads in this section you'll see people talking about the funky tire pressures and alignments to make these beasts work. Even then the life expectancy is pretty darn low with in comparison to a normal tire.
Ok... off to bed...