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20s to 17s for winter

Discussion in 'Ram, pickups, commercial trucks' started by dfarc, Oct 21, 2017.

  1. dfarc

    dfarc Well-Known Member

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    Thinking changing my 16 Ram Crew 20s to 17s for the winter. My 20s are 275/60R/20.
    I found 17" steel rims off of a 2011 Ram 1500. 17" wheels on a Ram come with 265 70 17.
    Tire sizing says best match is 285/70R/17. Which are not very popular thus pricey.
    I've found reasonably priced 265/70/R17 (Hercules Avalanche RG-2(Nokian)
    and 285/65R17( Yokohama iceGUARD iG51v)
    How far can I go size wise?
    Thank you for reading and appreciate your responses.
     
  2. dfarc

    dfarc Well-Known Member

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    Also, it's a city truck...no huge loads, deep snow or offroading.
     
  3. valiant67

    valiant67 Rich Corinthian Leather
    Level III Supporter

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    Even if you can't exact;y match overall size, you may find a tire shop that can make you a deal on adjusting the speed reading in the computer based on the different sizes. The other option is a tuner that lets you adjust for tire size yourself, like I have for my Wrangler, though it may be more expensive for the Ram.
    The other concern is if the 17" wheels will clear your brakes. I don't know enough about the newer trucks to say. And the weight rating of the new tires.
     
  4. dfarc

    dfarc Well-Known Member

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    I wondered about the brake fit also.. the 2 17s I mentioned are about 4% smaller overall than factory 20s. Is it only brake clearance and odometer difference that I should be concerned with?
    Thanks.
     
  5. bguy

    bguy Well-Known Member

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    Did the factory offer 17's as an option?
    I was surprised to find there are different alignment settings for 17 vs 20" wheels.
    I do know a couple guys who do 17 winter 20 summer. I pretty sure they don't hit the alignment rack twice a year so I don't expect much difference in the feel.
     
  6. dfarc

    dfarc Well-Known Member

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    It's a Laramie and 20s were standard. Don't know if they were an option in 16 or not. Just checked and they're not an option this year, at least in Canada.
     
  7. bguy

    bguy Well-Known Member

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    I don't believe you'll have any fitment issues with the 17" wheels. Check your spare, I'll bet it's a 17".
     
  8. dfarc

    dfarc Well-Known Member

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    Hey your right! Doh!
    Thanks.
    It's not only the 17s it's the other sizes "275 65" ,is there a rule of thumb for total overall height of rim/tire. Like, can i go 4% higher or smaller overall size wise?
     
  9. 68RT

    68RT Well-Known Member

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    Different axle ride height will change the contact point on the tread where the pivot axis meets the tire centerline. Changes a lot of self centering and toe-in characteristics. Ask Jeepers about the death shake.
     
  10. dfarc

    dfarc Well-Known Member

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    Remember the Ram death wobble.
     
  11. dfarc

    dfarc Well-Known Member

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    I remember the Ram death wobble.
     
  12. dfarc

    dfarc Well-Known Member

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    I remember the Ram death wobble.
     
  13. dfarc

    dfarc Well-Known Member

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    I remember the Ram death wobble.
     
  14. Old School Cool

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    tirerack shows specs on the OEM tires
    - P265/70R17 is listed at 660 revolutions/mile
    - P275.60R20 is listed at 634 revolutions/mile

    This means with the 17" wheel/tires, your speedometer and odometer will show fast by 4% (or the other way around, you'll be going 4% slower than indicated) without a correction
     
    dfarc likes this.
  15. Shane Estabrooks

    Shane Estabrooks Active Member

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    Here's a simple way I do it.. 275x60x2/2540+20=32.99" so your stock tire is 33" dia. My suggestion is 265/75R17= 32.64 in a good winter tread would work. Each brand is a little different in tread heights so this formula is only going to get you close. I switch between 18 and 17's there is a 1/2" difference between the two, so my 17' spare is something to consider if getting a flat.
     
    dfarc and somber like this.
  16. rapidtrans

    rapidtrans Well-Known Member

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    Does the vehicle have tire pressure monitoring?
    If so. Can you swap the monitors between wheels or have to buy additional set with the new wheels.
    Just wondering. Looking to go with winter tires/wheels on the Charger.
     
    Shane Estabrooks likes this.
  17. Shane Estabrooks

    Shane Estabrooks Active Member

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    Yes you can... my dealership helped me with that.
     
  18. Shane Estabrooks

    Shane Estabrooks Active Member

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    Something else to consider for winter tires and or bigger tires, I would suggest powder balancing over weights. In my experience packed snow, mud etc. is easier to take when leaving trails. Tires with lots of rubber like on trucks (285/75R17) not for 20's. I have powder balanced 265/75R17 before and loved it, with the conditions we occur it is the best way.
     
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  19. dieseldog1970

    dieseldog1970 Active Member

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    I would just match whatever spare you have and go buy winter tires in that size...that 17" spare tire is the same size as your 20" (actual height, pull it out and stand it up beside the one on your truck).....as long as it is the same size, nothing will change...speedo will be exact...I bought winters for my truck that has 33-12.50-17's on it, tire store matched it up based on height of tire. You can run a smaller tire, but just remember that if your truck is equipped with a limited slip or sure grip type of rear diff, you CANNOT mix tire sizes, this can cause major problems with each side rotating at different speeds...it could get REAL expensive!!
     
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