Going from 18" to 16" rims





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  1. #1
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    Default Going from 18" to 16" rims

    Advice please:
    My 2017 Trailblazer runs on 265/60x18 tyres. I'm totally happy with the cars behaviour on dirt roads and off road in our mountains. We have just left the Kalahari and I needed some low pressure running in thick sand. Once again, the car behaved impeccably, but it is my opinion that the tyre profile is too low. I believe that there's not enough benefit in increased contact size and that the rim gets too close to the ground at 1.5 bar.

    I do not want to increase the rolling diameter as the Trailblazer has relatively high gearing as it is. Also, I cant fit a bigger spare wheel under the car. The odo on my car is 100% accurate and the speedo is just about 98% accurate, so I don't want to mess with that either.

    A tyre app suggests that 265/70x16 will have the same size (0.3% difference) as my current setup. The 2.5 TB runs on 16" rims, so I suspect 16" will fit over the calipers (and a visual inspection convinced me that there is more than a inch of clearance on my car).

    Any comments, suggestions or experience on this matter will be appreciated and factored into my next move (if any).

    PS
    Silly as this may sound, the Trailblazer is a pretty car (not a rugged looking 4x4) and I'm really worried that I will make it look stupid in the process.
    Last edited by RoelfleRoux; 2018/10/15 at 05:53 AM.

  2. #2
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    Default Re: Going from 18" to 16" rims

    1.5 bar is not really deflated, you need to get down to 1 bar at least for the sand.
    I am no expert, but I were you I would first consider better quality tyres that can handle the low pressure and then see if I could increase the profile to 65.
    Even with a smaller rim and higher profile when you properly deflate for sand the rim is going to get close to the ground.

  3. #3
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    Default Re: Going from 18" to 16" rims

    Make sure you can go smaller. The caliper might be in the way.
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    Default Re: Going from 18" to 16" rims

    Hi Bex, thanks for the response.
    1) Yip, 1.5 isn't enough for sand, I know - and there is my problem.
    2) Bigger diameter wheel is not an option, as explained in my post, so 65 profile on current rims is too little benefit and won't do gor me.
    3) "better tyres" is a given, but my current factory fitted HT set is surprising me.

    I alwsys try to look for "extreme end-members" when I want to clear something up in my own mind and here is my current thinking:
    Let's assume similar sized wheels- one with 5% profile and one with 95% profile. No matter how low you drop the pressure on the 5, you are not going to get any real additional footprint. If you let half the air out of the 95, then the footprint will be huge. And I'm chasing the biggest footprint that is reasonable to achieve given options available to me.

    PS. We travelled from Askam to Calvinia yesterday and that brought back so many memories of my few years in the Pofadder area. I really need to come and look you up one day.
    The Kenhardt Hotel still has the same long stoep.

  5. #5
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    Default Re: Going from 18" to 16" rims

    Henri,

    Will do, but like I said: I did a quick inspection, and it looks OK. Also, the "lesser model" comes standard with 16" rims
    Last edited by RoelfleRoux; 2018/10/15 at 06:51 AM.

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  7. #6
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    Default Re: Going from 18" to 16" rims

    Maak net seker die aantal boute, en plassing van boute (PCD) is dieselfde en dat jou rem calipers sal pas.
    Is die ander rims se off-set dieselfde? As rims te ver na binne of buite toe gedruk word kan dit maak dat bande iewers kan skuur.
    Last edited by pietas; 2018/10/16 at 06:58 AM. Reason: typo
    Groot berge en lang grondpaaie

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    Default Re: Going from 18" to 16" rims

    Pietas, I have the exact specs for the rims. But yes, your warning is valuable. I was "stranded" in the Kruger thirty years ago with a caravan spare that had the incorrect hole spacing.

    Be assured, my car is still very new and I'll not take any chances or short cuts.

    I have just looked up tyre prices. My preferred tyre is the new GY AT Adventure.... now wait for this.... drum roll.... the 16" is R1600 cheaper than the 18". Unbelievable!!!

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  10. #8
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    Default Re: Going from 18" to 16" rims

    If you are worried about the looks, which is a valid point, why not compromise and go to a 17 inch wheel. It gives you a bit bigger profile (13mm) but shouldn't spoil the looks to much or the ride quality. When you increase the side wall by dropping the rim size you might experience more flex in the side wall when driving around corners. I am not sure if it would bother you or not but on a 16 inch wheel you would be increasing the side wall by 25mm.

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    Red face Re: Going from 18" to 16" rims

    Quote Originally Posted by pietas View Post
    Maak net seker die aantal boute, en plassing van boute (BCD) is dieselfde en dat jou rem calipers sal pas.

    Pietas, dis PCD - Pitch Circle Diameter.

    Ek raas nie, help net reg......


    En dan is daar nog offset ook. As die offset te veel postief is kan die rim dalk aan die hardeware aan die binnekant (soos die tierod-ends) raak. Te veel negatief, kan die bande dalk die modderskerms raak as jy deur 'n draai gaan op 'n 4x4 roete of deur 'n knik in die pad
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  13. #10
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    Default Re: Going from 18" to 16" rims

    I agree with the 17" approach on this one Roelf.

    Best of both worlds. Looks good and will work well.

    I did the dunes at Swakop with BFG's and although I had to get down to 0 8 bar to get them to work, 1 bar would work on any other tyre.

    Cheers
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  15. #11
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    Default Re: Going from 18" to 16" rims

    Thanks gents.
    Isn't he handsome, what do you think Henri?
    My wife took this pic today.

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    Default Re: Going from 18" to 16" rims

    I have consodered the 17" suggestions. I don't think the benefit is worthy of the effort. My 2000 Gen3 Pajero had 16" rims and high profile tyres and it performed normally.

    I just need to find the right rims and decide when to swap tyres. The current tyres are still perfect and it will be a shame to let it go to waste. Another consideration is the factory fitted TPMS. If the 18" ones can't be fitted to the 16" rims (and I fail to see why not), then I'll have to get a set of those as well. My service manager says Bosch units will work on my OEM system.

  17. #13
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    Default Re: Going from 18" to 16" rims

    Why not try swop rims with the lessor model sure thatís a win for both sides of the party

  18. #14
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    Default Re: Going from 18" to 16" rims

    Quote Originally Posted by vidalbum View Post
    Why not try swop rims with the lessor model sure thatís a win for both sides of the party
    Too narrow...

  19. #15
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    Default Re: Going from 18" to 16" rims

    Quote Originally Posted by RoelfleRoux View Post
    Thanks gents.
    Isn't he handsome, what do you think Henri?
    My wife took this pic today.
    Lovely observatory Roelf.

    Oh and the Chevy not too shabby neither.
    Just looking for a Paj to recover hahahaha
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  20. #16
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    Default Re: Going from 18" to 16" rims

    On the pre face-lift it would have been a challenge to do a swap. Those 2.5 had the narrow ugly rims and tyres. Will this not work on the face-lift model. I know the new 2.5 has the bigger wider rim on so should work by just looking at it. (Did not measure)
    Pieter Kruger le Roux

  21. #17
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    Default Re: Going from 18" to 16" rims

    Not sure why 17inchers won't be up to the task?! 265/65/17's have more than enough profile to be properly deflated and still perform perfectly. 17" rims will look better than 16'' rims, too.

  22. #18
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    Default Re: Going from 18" to 16" rims

    I tried the 16" on for size today. It fits, no problem.
    The quote for 5 is in my pocket, just waiting to see if they can get a buyer for my old wheels.

  23. #19
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    Default Re: Going from 18" to 16" rims

    Doesn't look too bad Roelf. You could live with that!
    Good luck with the sale of the rims
    # 5 Mitsubishi Pajero GLS 2015
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  24. #20
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    Default Re: Going from 18" to 16" rims

    I prepared myself for some tours by buying some BFGs .

    The trip came up sooner than the original Bridgestones lasted.

    So I have 4 not so finished Bridgestone HTs lying in the garage.

    I am considering a cheap set of rims so I can use them up and save the BFGs

    It will cost R1200 each time I want to change tyres. 4 times I might as well have bought the rims.

    Oh well decisions decisions
    # 5 Mitsubishi Pajero GLS 2015
    # 4 Mitsubishi Pajero Sport 2013 trade in
    # 3 Mitsubishi Pajero Sport 2011 good trade
    # 2 Mitsubishi Pajero Sport 2010 did not aquaplane so well
    # 1 Mitsubishi Colt 2005 with 3.2 DID (160kw WOW!)
    Jurgens Xplorer 2013 (new retirement home)
    Challenger Wilderness "The Penthouse" (sold and will be sorely missed)
    Platkar 1: BMW 118 (SWAMBO)
    Platkar 2: Nissan 200 SX (Retirement project)

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