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Larger Tire Impact Question

Discussion in '3rd Gen Tundras (2022+)' started by TrueBlueMaxx, Feb 4, 2023.

  1. Feb 4, 2023 at 11:17 PM
    #1
    TrueBlueMaxx

    TrueBlueMaxx [OP] New Member

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    I recently purchased new Tundra SR5 Off-Road and had the TRD lift installed. I think the stock Michelin 265 /70 R18s look too small for the lift. The dealer said I could add more aggressive tires; however, he said Toyota said not to go to a larger size. I am planning on going to Nitto Ridge Grapplers 265 /70 R18 which may look a little better than the Michelins, even though they are the same size. I would really liked to go to something like a Nitto Ridge Grappler 295 /70 R18s.
    I have read this will impact the speedometer, which in turn will cause the automatic transmission to shift incorrectly.

    Assuming this larger tire did not rub with the TRD lift, would the computer not receiving the correct speed actually damage my truck in the long run? It seems tire size should be something the dealer should be able to configure on the main computer. Does anyone know of a way to run slightly larger tires that will not harm the truck? I am trying to understand all of the drawbacks and discover if there are any work arounds.

    Thank you,
    Maxx
    Tundra with TRD Lift.jpg
     
    Yaboy likes this.
  2. Feb 5, 2023 at 5:37 AM
    #2
    TexasTacoma713

    TexasTacoma713 New Member

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    Transmission will function fine but anything you do is going to affect MPGs.

    Lift kit, lose 2-3mpg
    Open sunroof, lose 9mpg
    Turn off auto stop/start, lose 13mpg
    Change radio station, lose 17mpg
     
    Nic146, Kap1, Coasty and 15 others like this.
  3. Feb 5, 2023 at 6:16 AM
    #3
    firefightermtn

    firefightermtn New Member

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    I'm curious....
    WHY did the dealer say to not go larger? MPG? Warranty void?

    Thanks!
     
  4. Feb 5, 2023 at 7:11 AM
    #4
    Yaboy

    Yaboy New Member

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    Do what whatever you can afford, this will show you the speedo difference. The dealer will change the tires and it doesn’t want the headache of putting big tires on and dealing with you further, that’s what they do around here they all say you can’t put big tires on anything and just sell you same size different tire. Seriously go out and buy some 35s
     
  5. Feb 5, 2023 at 8:35 AM
    #5
    Ponderosa_Pine

    Ponderosa_Pine

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    Looks like that 295/70r18 Ridge Grappler is also a heavy tire at 70lbs compared to other 34”-34.5” varieties. That’d increase your rotational mass by 30lbs+ per corner which using race car math would be like adding 850-900lbs to the truck for all 4 wheels aka would feel like you had 3 NFL linemen in the truck at all times. There are other lighter options in similar sizes which can help avoid this and/or lighter wheels too.
     
  6. Feb 5, 2023 at 9:01 AM
    #6
    PBNB

    PBNB TRD Crew

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    70 lbs! and a lot of that is at the tread! My take-offs (18" TRD/Michelin same as the OP) weigh 70 lbs as a complete unit. Perhaps the dealer was speaking more from the point of view of a buddy recommending not to go there? There will be trade offs, getting a more aggressive tire may suit your situation better than the starter Michelins. The MPG affect seems to happen regardless of the change. Even going to REAL tires of the same size will affect the MPG's as the tire weight will go up.

    My choice was to add and change things to suit my preferences. I just stop at the point of getting the chop saw out! Afterall, it is my truck after 398 more payments :)
     
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  7. Feb 5, 2023 at 1:02 PM
    #7
    TrueBlueMaxx

    TrueBlueMaxx [OP] New Member

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    Thank you, everyone for the great feedback! It is very helpful. I still learning to read tires sizes and load ratings. Does anyone have a good recommendation of a good 34”-34.5” tire similar to the Ridge Grappler o BF Goodrich AT T/A KO2 that is not too heavy?
     
  8. Feb 5, 2023 at 1:04 PM
    #8
    Yaboy

    Yaboy New Member

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    Cooper AT3 XLT

    06446D0C-8E77-4596-91B1-8AF10F187D74.jpg
     
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  9. Feb 5, 2023 at 1:29 PM
    #9
    Nbab23

    Nbab23 2020 SR5

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    Stillen CAI, DD 8” exhaust, Toytec Aluma coilovers, Icon leaf springs, SCS SR8 18x9 wheels, Cooper Rugged Trek 275/70/18 A/T Tires, Ecoological bumper shellz and grill surround, AJT interior black out kit, AJT shift knob. TRD pro style grill, VLED aqua blue footwell lights, MESO custom dome and map LED lights, swing case, Rough country bed mat, TRD pro headlights and fog lights, Morimoto XB tail lights and 3rd brake light.
    Cooper Rugged Trek is what I have. Nice and aggressive looking and not too heavy.
     
  10. Feb 5, 2023 at 5:45 PM
    #10
    Paul Moll

    Paul Moll New Member

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    Cooper AT3 4S in 275/60/20 (one size up from OEM) vs crappy Falken Wildpeak AT3WA (note the A at end). Those were OEM on 1794 TRD OR. Picked up about 1/2 inch "free" lift and 5 poinds heavier than OEM. I measured 13/32 tread on the Coopers, 8 or 9 /32 on OEM.
    messages_0 - 2023-02-05T184045.316.jpg
     
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  11. Feb 5, 2023 at 6:00 PM
    #11
    GODZILLA

    GODZILLA Hail to the King, Baby.

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    The dealer was half right. Yes, larger tires will throw off your speedometer. No, your transmission doesn't care what the speedometer says.

    What it does care about is the final drive ratios. Think of the tires as another cog in a system of gears. If you change the size if will affect the ratio between the starting cog (engine/transmission) and the final cog (tires), and it is set with shift points for a specific size/range of tire.

    That's why on previous gens people would/had to regear when the went to 35s or larger. Same thing applies to 3rd gen, BUT it's a different truck so the size that benefits or requires a regear will likely be different. In other words, don't misinterpreted this as "as long as you're under 35" tires you're fine" but rather as encouragement to research when that point is.
     
  12. Feb 5, 2023 at 6:19 PM
    #12
    Paul Moll

    Paul Moll New Member

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    That's an excellent point @GODZILLA.

    I petition that buying 265/70/18 in the case of @TrueBlueMaxx situation is of zero consequence even though after market tires that size will likely be a bit larger than OEM. This is because it seems to me, maybe I'm wrong, that all the OEM tires are some under size. I would be quite disappointed if Toyota didn't consider that when gearing and programming the transmission.
     
  13. Feb 5, 2023 at 7:35 PM
    #13
    xc_tc

    xc_tc New Member

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    Many things are affected by installing a larger diameter tired. It won’t hurt the truck but you have to accept certain tradeoffs.
    1. A larger diameter tire travels more distance for each revolution so your speedometer and odometer will be wrong. This also makes the displayed fuel economy show incorrect.
    2. LT tires have much higher rolling resistance and mass than the stock tires so of course your fuel economy will go down.
    3. Larger diameter tires can reduce the acceleration slightly. Your wheel torque doesn’t change but because the diameter got larger, the force applied to the road is smaller (wheel torque = force x tire radius).
    1 & 3 are reasons why some people will regear the rear end. A lower rear end ratio can resolve these issues. A ~3.5:1 gear ratio would solve the issues in 1 & 3.

    Also, I believe the transmission shifts based on its input shaft speed not vehicle speed. Anyway, you may not notice any difference in shift points because the ECM doesn’t know you changed the tires.
     
    mayan and TrueBlueMaxx[OP] like this.
  14. Feb 5, 2023 at 8:16 PM
    #14
    TrueBlueMaxx

    TrueBlueMaxx [OP] New Member

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    Thank you all very much for your input! This is very helpful!
     
  15. Apr 29, 2023 at 5:37 PM
    #15
    2010DC

    2010DC New Member

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    Nbab23. What size Rugged Treks are you running and do you have stock wheels?
    Sorry. Found your post from Sep’22
     
    Last edited: Apr 29, 2023
  16. Apr 30, 2023 at 9:18 AM
    #16
    Rockgate

    Rockgate New Member

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    With rugged trek, you're limited to a 275/70r18 (33.66") if you had 20's you could get 275/65r20 (34.65")or 35x12.50. weights for each are 59,63,70#'s.
     
  17. Apr 30, 2023 at 10:14 AM
    #17
    Nbab23

    Nbab23 2020 SR5

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    Stillen CAI, DD 8” exhaust, Toytec Aluma coilovers, Icon leaf springs, SCS SR8 18x9 wheels, Cooper Rugged Trek 275/70/18 A/T Tires, Ecoological bumper shellz and grill surround, AJT interior black out kit, AJT shift knob. TRD pro style grill, VLED aqua blue footwell lights, MESO custom dome and map LED lights, swing case, Rough country bed mat, TRD pro headlights and fog lights, Morimoto XB tail lights and 3rd brake light.
    Yep 275/70/18. I have SCS wheels which have a different offset than stock.
     
  18. Apr 30, 2023 at 10:41 AM
    #18
    Breathing Borla

    Breathing Borla I'd rather be fishing

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    that’s a ton more weight than stock wow
     
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  19. May 1, 2023 at 7:41 AM
    #19
    Rockgate

    Rockgate New Member

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    Indeed. My factory TRD OR Michelin's say 37#'s, where as my now 275/70R18 are 57#'s. I feel a slight difference in power but not as much as I thought. At least now, it doesn't spin as easy when it's wet out.
     
  20. May 1, 2023 at 8:11 AM
    #20
    DMackler

    DMackler New Member

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    I removed my factory michelin's over the weekend, pushing on the tread and sidewall there is so much flex it doesn't seem like they would be fit for a RAV4. I can see why the weight numbers are so low with them.
     
  21. May 1, 2023 at 8:39 AM
    #21
    Black widow TRD

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    What did you end up going with.
     
  22. May 1, 2023 at 9:39 AM
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    mass-hole

    mass-hole New Member

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    I dont know about 18" wheel but seach tire rack for Load Range C tires. They usually shave some weight off.

    I know there are a number of 35ish inch Load Range C tire for 17" wheels that are reasonable.

    -BFG KO2 315/70R17's are like 62 lbs
    -Toyo Open Country 35x11.5's are 63 I think
    -Nitto has a few 35x11.5's in that 60 lb weight range.
    -Goodyear Wrangler Territory MT 315/70R17's are like low 50's but are small for a 315/70.

    Unfortunately, a 35" tire is simply going to weigh a lot. Its not like they make 35" all seasons with lightweight builds. If you are moving to a 35 you are moving to an offroad oriented tire with a heavier construction.
     
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  23. May 1, 2023 at 10:30 AM
    #23
    Black widow TRD

    Black widow TRD New Member

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    In our trucks at work we run the Toyo Open Country, I’ve been pleasantly amazed at well they do both off-road and on pavement and we out our trucks thru their paces wether it’d be the mountains or dessert terrain, or rocky ridges in the mountains. We got some F150/250 and Chevy Silverados/Tahoes fitted with these tires….

    they do not disappoint, grant you our wheels are usually 17”.
     
  24. May 1, 2023 at 12:21 PM
    #24
    rruff

    rruff New Member

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    The worst it could be is 2x the added weight (or 240 lbs total) for initial (low speed) acceleration, if all the weight was at the periphery of the tire. For steady speeds it's just the added weight of 120 lbs. Please tell me where you got this "race car math"?
     
  25. May 1, 2023 at 12:27 PM
    #25
    Nomoredomestics

    Nomoredomestics New Member

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    It's a thing in the racing industry. That every 10 pounds of unsprung, rotating weight or whatever may have you, is like adding 100 pounds to the vehicle. I can't swear by it as far as accuracy but it is a thing.
     
  26. May 1, 2023 at 1:06 PM
    #26
    rruff

    rruff New Member

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    Assuming you want to keep your stock rims, that is the tire size you want. I wouldn't get Ridge Grapplers though, because they suck gas. I'd pick something with an S speed rating. Cooper or Toyo ATs would be good bets.
    It would have a noticeable effect on suspension and handling performance on a track, but offroad the ability of the bigger tires to absorb and roll over bumps will be much better. For things like acceleration it's a minuscule difference. Taller gearing is what will slow that down if you don't regear.
     
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  27. May 1, 2023 at 1:15 PM
    #27
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    You sound like you own a 2.5 gen lol
     
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  28. May 1, 2023 at 3:51 PM
    #28
    2010DC

    2010DC New Member

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    Local shop in Birmingham has 275/70/18 Rugged Trek for $299. They said may have to do a little trimming to skid plate to fit my stock SR5 2010 4wd. Already removed both mud flaps all around. Didn’t want to get a lift right now.
     
  29. May 1, 2023 at 5:22 PM
    #29
    rruff

    rruff New Member

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    I fit my 35x13s without a lift, with +25 9" wide rims. 295/70r18s would be very easy with stock rims.
     
  30. May 1, 2023 at 5:50 PM
    #30
    xeuxaz

    xeuxaz New Member

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    I’m close to +22 on 18x9 with 37x12.5 with Westcott. Still has plenty of get up and go. They are like 73lbs per tire.

    Speedo is about 10% off. Free longer warranty.

    13-16mpg hurts though!
     
    Last edited: May 1, 2023
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