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post #1 of 10 (permalink) Old 05-24-2008, 05:22 PM Thread Starter
 
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Basic Tire And Rim Questions

Possibly looking into buying a new set of rims/tires. A few questions I have are: What are the benefits of bigger rims (Currently 16"), also benefits of bigger/smaller tire aspect ratio. Stock are 255/70 SR 16.

2009 F150 XLT 4X4 5.4 / 2" Autospring Lift / 275/65R20 BFG All Terrains (34.1)
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post #2 of 10 (permalink) Old 05-24-2008, 06:49 PM
 
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Mostly about looks, but bigger rims can accommodate allot bigger tires and bigger brakes


All depends on brakes and gears and clearance you have, but I had 265/70/R16 at first on my truck, and I now have 35" tires on 17" rims, I notice a difference when accelerating or stopping but the stopping power is still good and my Edge tuner makes up for stock gears, 6" lift helps clear the tires.

For a stock Ranger I would probably go 16-17" rims on 31-33" tires I think you would be safe, but there is always offset and backspacing to consider, most dealer's know what will fit or not


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post #3 of 10 (permalink) Old 05-24-2008, 08:14 PM
 
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tire size all depends on what you want to do with it.

for my car the stock size is 195/60R15. if you don't know what the numbers mean i'll break it down for you its very simple.

195 = the width of the tire in millimeters, so 195mm.
60 = the percentage of the width, for the height of the tire. so 60% of 195 is 117, so the tire is 117mm high.
and lastly 15 is the rim size.

the middle number is probably the most crucial for handling and ride. soon im changing my tires to 215/45R17. so its going to be a lower profile tire (height) with a fairly large width, this will improve traction and handling a lot. but since its overall bigger, gas mileage and ride will decrease slightly. the middle number more or less determines how comfortable the ride is, also how the tire will handle in cornering.

my dads 2002 F-150 runs a 275/60R17 which is basically just big overall lol, rides nice and has lots of traction.
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post #4 of 10 (permalink) Old 05-24-2008, 09:04 PM
 
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Bigger rims can also lower your fuel economy, nothing worse than seeing a guy get exhaust/intake/tune than throwing 20s on. Bu-bye any HP gains.

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post #5 of 10 (permalink) Old 05-24-2008, 11:42 PM
 
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very true, you want a rim that has most of the rotating mass in the center. however you can also get lightweight rims. the 17's that im getting are only 12 pounds, 3lbs lighter than my current stock 15s. they just cost more...however not totally outrageous, about 200 each
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post #6 of 10 (permalink) Old 05-25-2008, 02:08 AM Thread Starter
 
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Thanks for the info guys

2009 F150 XLT 4X4 5.4 / 2" Autospring Lift / 275/65R20 BFG All Terrains (34.1)
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post #7 of 10 (permalink) Old 05-25-2008, 07:01 PM
 
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Dont forget that when you change the outer circumference the distance the tire moves in a single rotation changes and that in turn changes the speedo, and odometer...
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post #8 of 10 (permalink) Old 05-26-2008, 12:20 AM
 
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But as long as the truck is 99+ then you can recalibrate the speedo with a programmer or the dealership can do it. If its pre 99 you have to physically replace the VSS gear under the truck.


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post #9 of 10 (permalink) Old 05-27-2008, 09:34 AM
 
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Hmm didnt know that, thanks
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post #10 of 10 (permalink) Old 06-19-2008, 10:40 PM
 
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you think ford can calibrate speedo for a 54" tall tire ???


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