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tire size NEED HELP!!!!!!!!!

Discussion in 'The Lounge' started by fishingful, Mar 29, 2005.

  1. fishingful

    fishingful Time to fish!

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    will P225/60R16 replace tire size p225/75r16 fish4wallhas the bigger size and i want to know if the tires i have for sale will fit.....................thanks ......jim :)
     
  2. I think those are in mm. The 60mm verse 75mm is the height of the half. It will change the calib. for your computer on some models. Shift points,speedo,converter....
     

  3. Someone correct me if I'm wrong, but I think the 225 represents the height. The 60 vs. 75 represents the width ratio. The 75 is just a wider tire, same diameter.

    Sorry, I was wrong. That's quite a big difference. Here's a helpful site.
    http://www.miata.net/garage/tirecalc.html
     
  4. MAKtackle

    MAKtackle your REEL friend

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    The 60 series tire will be shorter and wider than the 75 series. Will it work? depends on clearance from the edge of the tire to closest stationary point. It will mount on the same rim but you will need to check clearnce while turning. Your speedo will change also, show faster on speedo than actually going. OH....And gas mileage will get WORSE!!!
     
  5. i have an 97 isuzu rodeo. how much worse will the gas be?
    thanks
    fish4wall
     
  6. I don't know if you could predict the difference in mileage. Actually, your speedometer will show SLOWER than your going, by 6 mph. I would be more concerened with the shift points, etc., than mileage.
     
  7. so what your telling me is i shouldnt do it....
    and thats what i feel also...lol
    but hes selling them for $30.. all 4.
    its hard to turn them down...lol
    thanks
    fish4wall
     
  8. shuvlhed1

    shuvlhed1 Banned

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    You are not going to be changing the tire size much. Unless you are running larger than stock tires, I doubt rubbing would be an issue. For $30, how can you go wrong.
     
  9. rockbass

    rockbass Banned

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    I was also thinking about those tires for my Ranger. I have the 75 on it now. But itis a little out of my way to get them, so I figured I would pass :)
     
  10. rockbass

    rockbass Banned

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    Oh yeah and thanks to M Magis for that link. :D
     
  11. Shuvlhed1, read through that again. He WOULD be going up in tire size, by 10%. That $30 could cause a lot of problems.
     
  12. shadowman

    shadowman Supreme Being

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    i wouldn,t do it the 60 series is a lower wider low profile tire and chances are they are going to rub while turning not to mention the difference in height clerence...........nope wouldn,t do it.
     
  13. fishingful

    fishingful Time to fish!

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    it is p225/60r16 replacing p225/75r16 is that going up in size or down you guys have caught my curosity i allways thought that the bigger the number the larger the tire what does the numbers mean thanks..................jim
     
  14. OK, I completely read this wrong. It would be going down in size, but still could cause problems.
     
  15. Here ya go......225 is the width of the tire, 60 is the height of the side wall (as someone already stated the 60 is a bit more of a low profile tire but not much), and the 16 is the size of the wheel the tire fits on! Hope that helps!
     
  16. man you guys got me going. 225 or 195 or 205 is the height of tire and the 50 60 70 75 series is the width and the 14 15 16 is wheel size.
     
  17. misfit

    misfit MOD SQUAD

    tell 'em husky :D
    now for some more confusion ;)
    the 50,60,70,75 pertains to the ratio of the hieght to the width.in other words,for a 60 series tire,the hieght would be 60% of the width of the tire.
    in other words,a 225 would be the same hieght,weather it's a 60 or 75 series.just a wider profile on the 60.that would not change speedo reading or performance.the side to side clearance could possibly be a problem,but i'm not sure.depends on the vehicle.
     
  18. I have to replace my tires on my ford ranger. Their size is 31*10.5 R15. What can we do there is no 60,70 or 75? ;)
     
  19. Fletch

    Fletch FishOn

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    If your replacing 225/75r16's with 225/60r16's...
    Your tire=
    225/75R16
    225 x .75 = 168.75 x 2 = 337.5
    16 x 25.4 = 406.4
    406.4 + 337.5 = 743.9 / 25.4 = 29.287 inches tall.

    New tire=
    225/60R16
    225mm x .60 = 135 x 2 = 270mm
    16 x 25.4 = 406.4mm
    406.4mm + 270mm = 676.4 / 25.4 = 26.629 inches tall.
    Your turning more more revolutions now to go the same speed, but when your speedometer says 60mph your 6mph under. Below are some other calculations from an old gear head.
    How much ground clearance will the tire size change make?
    New tire dia" - Original tire dia / 2 = Approx change in ground clearance.
    26.629 - 29.287 / 2 = 2.658 inches shorter
    How will it affect the acceleration? Not sure what your axle ratio is but...
    Original dia / new diam x original axle ratio = new axle ratio
    29.287 / 26.629 X 3.73 = 410 axle ratio
    or
    29.287 / 26.629 X 3.42 = 376 axle ratio

    How will it affect the performance? You'll have to see how many RPM's your
    turning at 65MPH for this one.
    original dia / new dia X RMP@MPH = New RPM @ actual MPH
    29.287 / 26.629 x 2000 = 2199 RPM@65(new RPMs at 65MPH
    but your speedo will be off)
    So your going to gain torque but loose top end.

    How far off will the speedometer be?
    New dia / original dia X Indicated speed = Actual speed with new tires
    26.629 / 29.287 x 65 = 59.1MPH
    (I think! LOL) I had it backwards at first.
    Fletch
     
  20. Fletch

    Fletch FishOn

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    Well the easy answer is....
    replace the old tires with 31x10.5R15's ;)

    I know I know... smart a$$!
    I had to.
     
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