Tires and Gear ratios
09-22-2008, 04:04 PM
#12
6th Gear Member
Join Date: Feb 2006
Location: Howard City, MI
Posts: 5,956
the only difference between the 225/60 and the 245/60 is the width. there gonna be around the same height. the 245 is a hair wider than the other. in my opinion the wider the better. your gonna have more traction off the line and in the end thats what counts. and with 3.73 gears, theres really not alot you can do to lose your acceleration or your cruise speed, 3.73 are the all around best gear for the ford. unless your an automatic car then id go with 4.10 as i did with my car.
The 245 is the width, the 60 is a percentage of the width which equals the side wall height. So, wider tires, taller the side wall.
You get a 275/60, the side wall is 60% of the width, same with a 245/60.
SO the 275/60 will be wider and taller.
OP, I went from a 26" tire to a 27" tire and it slowed my speedo down 7 mph, so yeah, taller tires, take out gear, shorter tires add gear.
09-22-2008, 04:11 PM
#13
6th Gear Member
Join Date: Feb 2006
Location: Howard City, MI
Posts: 5,956
275/50/15 (25.8" tall and 10.8" wide)in the rear would be perfect. In the front I would keep a 235/60/15 (26.1" tall and 9.25" wide) You want to keep it as close to a 26" tall tire in the rear, that is the stock height tire.
09-22-2008, 07:00 PM
#14
SVT Section Moderator
Join Date: Jul 2008
Location: Burnt Hills, NY
Posts: 15,601
09-22-2008, 11:17 PM
#17
2nd Gear Member
Join Date: Apr 2006
Location:
Posts: 417
WRONG!
The 245 is the width, the 60 is a percentage of the width which equals the side wall height. So, wider tires, taller the side wall.
You get a 275/60, the side wall is 60% of the width, same with a 245/60.
SO the 275/60 will be wider and taller.
OP, I went from a 26" tire to a 27" tire and it slowed my speedo down 7 mph, so yeah, taller tires, take out gear, shorter tires add gear.
The 245 is the width, the 60 is a percentage of the width which equals the side wall height. So, wider tires, taller the side wall.
You get a 275/60, the side wall is 60% of the width, same with a 245/60.
SO the 275/60 will be wider and taller.
OP, I went from a 26" tire to a 27" tire and it slowed my speedo down 7 mph, so yeah, taller tires, take out gear, shorter tires add gear.
Check this out:
e.g. 285/40/18
285mm x .40(40%) = 114mm
114mm x 2 sidewalls (a top and a bottom if you will) = 228
228mm / 25.4(mm per in.) = 8.9763779in.
8.9763779in. + 18in. wheel = 26.976377in. tire. (before the weight of the car on it of course)
That was fun, let's do another...i think this is the stock tire size on my 89lx.
225/60/16
225mm x .60(60%) = 135mm
135mm x 2 sidewalls (a top and a bottom, or left and right)
270mm / 25.4(mm per in.) = 10.629921in.
10.629921in. + 16in. wheel = 26.629921in. tire.
The taller the tire, the more ground it will cover per revolution. The lower the gear the quicker they will turn. They have a direct effect on one another.
Hope this was somewhat useful.
09-23-2008, 08:25 AM
#18
2nd Gear Member
Join Date: May 2008
Location: Florida
Posts: 478
That's exactly right. Not all "40series" tires or "50series" (as they are often called) tires are the same height. That number is the tires aspect ratio. It is the height of the sidewall in relation to the width of the tire.
Check this out:
e.g. 285/40/18
285mm x .40(40%) = 114mm
114mm x 2 sidewalls (a top and a bottom if you will) = 228
228mm / 25.4(mm per in.) = 8.9763779in.
8.9763779in. + 18in. wheel = 26.976377in. tire. (before the weight of the car on it of course)
That was fun, let's do another...i think this is the stock tire size on my 89lx.
225/60/16
225mm x .60(60%) = 135mm
135mm x 2 sidewalls (a top and a bottom, or left and right)
270mm / 25.4(mm per in.) = 10.629921in.
10.629921in. + 16in. wheel = 26.629921in. tire.
The taller the tire, the more ground it will cover per revolution. The lower the gear the quicker they will turn. They have a direct effect on one another.
Hope this was somewhat useful.
Check this out:
e.g. 285/40/18
285mm x .40(40%) = 114mm
114mm x 2 sidewalls (a top and a bottom if you will) = 228
228mm / 25.4(mm per in.) = 8.9763779in.
8.9763779in. + 18in. wheel = 26.976377in. tire. (before the weight of the car on it of course)
That was fun, let's do another...i think this is the stock tire size on my 89lx.
225/60/16
225mm x .60(60%) = 135mm
135mm x 2 sidewalls (a top and a bottom, or left and right)
270mm / 25.4(mm per in.) = 10.629921in.
10.629921in. + 16in. wheel = 26.629921in. tire.
The taller the tire, the more ground it will cover per revolution. The lower the gear the quicker they will turn. They have a direct effect on one another.
Hope this was somewhat useful.
*Punches open hand*
It's nerd-bashin time!
LOL
09-23-2008, 08:44 AM
#19
2nd Gear Member
Join Date: Aug 2008
Location: Kentucky
Posts: 295
i have 275/50 on mine and a 4.10 gear and a built AOD, so a tire doesnt really do much for me regardless of what size it is. either i hook or i dont. but a 275-50 would look damn good on your car or any car for that fact.
09-23-2008, 10:11 AM
#20
2nd Gear Member
Join Date: Apr 2006
Location:
Posts: 417
So i'm a nerd because i know how to translate a metric tire size into inches?! WTF! Let me take a moment and thank the GOOD LORD that stupidity is NOT contagious! If it was and you sneezed we'd all be F***ED!