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Larger tire- higher speed/ lower speed

Discussion in '40- & 55-Series Tech' started by Cruiserhead05, Aug 16, 2003.

  1. Cruiserhead05

    Cruiserhead05 SILVER Star

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    i've got a question that i've never really gotten a clear answer on and it may seem very simple if you think about but i just want someone who knows to tell me, will larger tires on a cruiser makes it acceleration faster or slower and will its highway speed be faster or slower. now i've got an 82 and i realize with the 3.70 gears the larger tires may make it slower but i just want a solid answer....
     
  2. Landpimp

    Landpimp GOLD Star

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    [quote author=Cruiserhead05 link=board=1;threadid=4360;start=msg32565#msg32565 date=1061042990]
    i've got a question that i've never really gotten a clear answer on and it may seem very simple if you think about but i just want someone who knows to tell me, will larger tires on a cruiser makes it acceleration faster or slower and will its highway speed be faster or slower. now i've got an 82 and i realize with the 3.70 gears the larger tires may make it slower but i just want a solid answer....
    [/quote]

    larger tires will accelerate slower but have a higher top end highway speed. Basicly by going to bigger(taller) tire you are changing the effective gear ratio. On your 82 with 3.70's going to a 33" tire would be like now having 3.30(or something like that) gears.

    Hope this makes sense.

    FWIW I run 33x9.5 on a pair of 82 fj40, for the use I use em for(work/daily drivers) I find the 33's and 3.70 to be a very nice combo, still IMOP plenty of power off the line and good highway speed.

    On my fj60 with 33's I did swap to 4.10's, but it's a much heavier Cruiser, I find the 4.10 and 33 combo to be just right

    John H
     
  3. archie

    archie

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    I see it a different way. Speed is measured in MPH. Therefore your larger tires will increase the distance travelled (according to speedo calibration and circumference of wheel) and thus lower your MPH. So I vote lower speed reading(on speedo) but actually travelling a higher speed(in relation to speedometer).
     
  4. cruiserdan

    cruiserdan SupportingVendor Emeritus Supporting Vendor Moderator

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    Archie has it.


    With a taller-than-stock tire, a vehicle will be traveling farther and faster than indicated. Conversly, a vehicle with shorter-than-stock tires with travel slower and not as far as indicated.

    An example would be going from a 27 inch to a 30 inch tire (say a 235 to a 31x10.50). that is an increase of 10%. Therefore, the vehicle will travel 10% farther and 10% faster than indicated by the speedo.

    8)
     
  5. hammerhead

    hammerhead

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    I cured the top speed problem with 35s.
    Solved the acceleration problem with a V8.
    Solved the speedo problem by throwing out the cable.
    [move]HAHAHAHAHAHA[/move]
     
  6. lndcrzr71

    lndcrzr71

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    hammerhead has the perfect solution
     
  7. customcruiser

    customcruiser Old Member

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  8. theo

    theo

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    [quote author=cruiserdan link=board=1;threadid=4360;start=msg32582#msg32582 date=1061051089]
    Archie has it.
    [/quote]

    You all have it right!

    I should do the same. Instead I play the mental correction game: My pickup speedo records 4.5 miles for every 5 miles I travel. (I check it against the speed check markers on the interstate.) That's 90% of actual, so every time I look at the speedo I have to subtract 10% from an actual speed and see if it's about what I read. (Or I add 11% to the reading - ask me why I dare ya.) Just the sort of thing for a brain like mine. Can't see the forest for the trees! :p
     
  9. Landpimp

    Landpimp GOLD Star

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    [quote author=archie link=board=1;threadid=4360;start=msg32575#msg32575 date=1061048000]
    I see it a different way. Speed is measured in MPH. Therefore your larger tires will increase the distance travelled (according to speedo calibration and circumference of wheel) and thus lower your MPH. So I vote lower speed reading(on speedo) but actually travelling a higher speed(in relation to speedometer).
    [/quote]

    so whats the matter with my expanation? it's how it works......and in in terms that I can understand, who cares if you travel further, in reality.....what happens is exactly what I said. Read the original question!
    "will larger tires on a cruiser makes it acceleration faster or slower and will its highway speed be faster or slower. now i've got an 82 and i realize with the 3.70 gears the larger tires may make it slower"


    I answered it exactly the way he was looking for.......don't get me or the poster confused, you never touched on the real question, you are correct, but not right :flipoff2:

    John H