Join Date: Aug 2012
||LinkBack||Thread Tools||Display Modes|
Heads up, incoming tire fire. Those are hard to put out : ) Because you want sizes not brands ill stick with the question and hope that everyone else does the same.
Assuming your wheels can properly mount all three sizes the biggest difference will be sidewall tension, Sidewall flex and contact patch. A bigger contact patch will Increases traction (not the same as friction but close) and decrease fuel economy , A shorter sidewall means less to flex during cornering and less forgiving road feel ( louder and less confortable ride), and a wider tire on a slimmer rim will preload tension on the sdiewall which can in extreme cases cause unwanted thread patern deformation and abnormal tire wear.
For most drivers a sidewall of 40mm gives them a nice cornering without too much harsh road-feel or too much noise. 40 seems to be the magic number for most drivers and lots of guys swap their factory 235/45s for 240 or 245/40s
As for the width the only limitation is the ability of your sidewall to carry the width of the tire in your rims. If you go really wide , like 255/40 you might be putting additional stress on your sidewalls unless your wheel can support the extra width. that means you could be bending the thread pattern and reducing your contact patch.
Personally I would go with the 245/40x17s in something with a nice soft thread compound and stiff sidewall. Itll be a bit rougher than stock but it should corner well without sacrificing daily driving handling.
245/40/17 or 255/40/17
The middle number in tire sizing is not sidewall in a measurement in millimeters, it's a ratio of the tire width. A 40 sidewall means the sidewall is 40% as tall as the tire is wide. I don't think any wheel would fair well with 40 mm of sidewall. That's 1.5 inch. That pretty much voids everything you said. :-/
There is no problem running a 245/40 or 255/40/17 on those wheels. 245s would be a quicker tire due to less weight and a slight gearing advantage due to smaller circumference. But 255/40s would offer better peak grip and heat resistance in hard driving.
Thanks arcticscythe & brfatal for the explanations helps a lot to understand why some go 1 way or the other.
And, yeah, should've realized that I was asking for info about stuff folks might have strong opinions about Just wish tires somewhat more affordable so I wouldn't be worrying about making the wrong choice.
It's appreciated -
2 things to note.
1. Tire compound has more to do with level of grip than tire width. A 225/45/17 R-Compound (see racing tires) will man handle a set of 255/40/17 budget summer tires. What you are expecting out of the tire should be the most important factor that goes into what decides what you get.
2. Feeding into the above, your tires will last you years (in most cases), don't be afraid to spend a little more on something better. An extra $10 per year of use for a good tire is well worth it over a lesser tire that's $30-40 cheaper.
|Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)|