Will I have any issues mounting these on my GT500 rim? The rim is 18 x 9.5. I understand 285 is what is normally recommended, but will rims this size give me any extreme issues?

Thank you.

http://cgi.ebay.com/ebaymotors/2-Goo...s#ht_500wt_987

 

......

 

Thanks a lot for the quick response.

I wonder what the 295/45 will look like on the GT500 rims. I don't see many people running that combo.

Do you have pictures of the 305s on there? They look sick I'd assume.

 

I run 295/45/18 on 18x10 inch wheels. I love it.

 

That's a huge heavy tire. Gonna have some effects on gear ratio and acceleration. Just keep that in mind.

 

Yes, it will have effects on gear ratio as it's a 1.4" taller tire, and it is heavy... I am interested in seeing what my fuel economy and track times will be... can't drive it for another 2 months though.

 

How exactly does it effect the gear ratio?

 

I hope I don't step on any toes here, but if you increase the overall diameter of the tire, it's going to increase the amount needed to turn the wheel. Think of it like a gear of a bicycle. A smaller gear turns faster, and larger gear turns slower... or how the Under drive pulleys work.

You aren't CHANGING the gear ratio, the gear ratio will still be the same because of whatever gears you have in the car. Though you are putting a factor in that is inevitably giving you the performance of having a different gear. Same would be said if you went with a smaller tire height.

The upside of going with a taller tire, is more tire contact with the ground and possibly better traction. Example: Take two balloons, one larger than the other and place them both on a flat surface. The larger balloon will have more balloon touching the surface. Or something along these lines that I've read before.

Everything I have said is based on what I've been told, and what kind of makes sense. So if someone else would chime in that knows more on the subject, feel free to correct.

I have not extensively tested my setup, again, to know if it's beneficial or hurting me...but there are others who have the same setup that can chime in. I do know I sacrificed some of my overall gearing for looks, but realize there could be some traction/ride comfort out of it. It was a balance I was comfortable with. Also, as someone mentioned the tire is really heavy... but I can't imagine it being no where near as heavy as a 20" tire that so many drive around on.

 

https://mustangforums.com/forum/stre...eel-drive.html - Read this thread, to give insight on the effects on gear ratio.

My setup.

295/45/18 (28.45" Tall) + 3.55 gears.

Old setup
235/55/17 (27.18" Tall) + 3.55 gears

Changes to my overall gear ratio are ...

3.39.

If I wanted to go to a 3.73 gear, it would feel more like a 3.55 at 3.56. So essentially if I wanted the feel of a 3.73, I would have to go with a 3.90 gear, which translates to 3.725 or 3.73.

Hope that makes sense.

 

It is probably more correct to say that tire size effectively changes the gearing. A taller tire reduces the overall "leverage" that the engine has with respect to developing the forces at the tire contact patches. The effect is the same as keeping the same tires but going to a taller (lower number) gear ratio.

Obviously, it doesn't change the gears themselves.


Norm