what sizes will fit a 2014 RT rear wheel

[AeroPilot]

Whoops - pi r squared for Area

I first thought that too, but I was thinkin about the pi Dsquared which is the formula for area. The 9.4% difference is still a bunch and I can only guess what the computer will think about that. I have another Kumho 225 to go on after the one I have on now. May go for the 215 width next time in Michelin or whatever tread catches my eye. We are cruisers not canyon racers, so not so worried about performance tires, but just want good rain grooves and good wear characteristics.

You guys were supposed to catch this. Or as the old pun went "pie are not squared; pie are round".:lecturef_smilie:

 

[Bob Denman]

Bob you know how I dis-like using Diameter as a measuring reference ( it's very imprecise compared to circumference )........and looking at this Chart the difference between the Diameter and Circumference is EXACTLY the same % wise .......I am not a math major ....However this doesn't seem correct............just sayin.....Mike :thumbup::thumbup:

It makes perfect sense...
Circumference is Pi x Diameter...
a 9.4% change in wheel height, and no change to Pi (It is a constant), will always give you the same 9.4% change to circumference

 

[jcthorne]

Except tires are not round when sitting on the ground with weight. The contact patch is flat. You will note that tire specified rotations per mile do not match 5280ft divided by the circumference.

Also actual circumfrence of a given tire will not = nominal width * aspect ratio * 2 plus wheel diameter.

The size numbers are nominal tire sizes, not actual dimensions and they very brand to brand and for different lines within a brand.

 

[Bob Denman]

But it at least gives you a starting point!

 

[Richard Brown]

michelin rear 215/60/15

View attachment 102648View attachment 102649 215/60/15 Michelin Primacy with 8,000 miles on our 2012 Rt Limited. There are 8/32 of tread left.

Is there a Michelin tire for the front that works well?

 

[BLUEKNIGHT911]

LOOK HERE

Is there a Michelin tire for the front that works well?

Check the TIRERACK.COM site for your size in Michelin.............You don't have to buy it there, but you can find out what's available ......Mike :thumbup:

 

[UtahPete]

I think that the overall height of the 235/60-15, would set you up for a lot of grumbling from Nanny... :shocked:

This is helpful. Where can I find this online tool?

Thanks.

 

[Deanna777]

I am running the 215/60/R15 on the rear of spyder.
Deanna

 

[UtahPete]

I found this tool on the internet. Here are the three sizes we've discussed (OEM is the 225/50-15);

https://tiresize.com/tiresizes/225-50R15.htm
225/50R15
Diameter : 23.9"
Width : 8.9"
Wheel : 15" x 6-8"
Sidewall : 4.4"
Circum. : 74.9"
Revs/Mile : 846



https://tiresize.com/tiresizes/205-55R15.htm
205/55R15
Diameter : 23.9"
Width : 8.1"
Wheel : 15" x 5.5-7.5"
Sidewall : 4.4"
Circum. : 75.0"
Revs/Mile : 845


https://tiresize.com/tiresizes/215-60R15.htm
215/60R15
Diameter : 25.2"
Width : 8.5"
Wheel : 15" x 6-7.5"
Sidewall : 5.1"
Circum. : 79.0"
Revs/Mile : 802

 

[Peter Aawen]

Don't forget that those Size Comprison tools only refer to the NOMINAL tire sizes for each size listed or compared; the physical/actual tire sizes for various makes &/or types of tires wearing those same nominal sizes on their sidewalls might be and often are VERY DIFFERENT!! :lecturef_smilie:

I have one set of tires here right now where the rolling diameter is 50mm/2 inches different to the nominal dimension of the size shown on the sidewall! And there are many more tire brands/types where the differences might not be quite so much, but they are still significant. In fact, very few makes &/or types of tires conform exactly with the nominal dimensions of the sizes shown on their sidewalls, the OE spec Kendas being one of those tire makes & types! :shocked:

You can use the comparison sites as a starting guide, but you really need to compare the physical dimensions of the actual tires in whatever specific makes & sizes you are considering, or you might find they just don't fit in the space available! :gaah:

 

[BLUEKNIGHT911]

Don't forget that those Size Comprison tools only refer to the NOMINAL tire sizes for each size listed or compared; the physical/actual tire sizes for various makes &/or types of tires wearing those same nominal sizes on their sidewalls might be and often are VERY DIFFERENT!! :lecturef_smilie:

I have one set of tires here right now where the rolling diameter is 50mm/2 inches different to the nominal dimension of the size shown on the sidewall! And there are many more tire brands/types where the differences might not be quite so much, but they are still significant. In fact, very few makes &/or types of tires conform exactly with the nominal dimensions of the sizes shown on their sidewalls, the OE spec Kendas being one of those tire makes & types! :shocked:

You can use the comparison sites as a starting guide, but you really need to compare the physical dimensions of the actual tires in whatever specific makes & sizes you are considering, or you might find they just don't fit in the space available! :gaah:

:agree::agree::agree: …………….. This fact seems to get mentioned at least twice per Tire Thread …… maybe it should be a STICKY :roflblack::roflblack: ……....Mike hyea: