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Thread: 2017 Spare Tire Mod for U.S.

  1. #16
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    just FYI, the CX-7 had two types of spares also,

    the AWD CX-7 got the 18x4 rims T155-90D18 (28.9" diameter)

    http://www.ebay.com/itm/2007-2012-Ma...19.m1438.l2649





    and the FWD CX-7 got smaller 17x5-1/2 rims (sorry don't know the tire size, eBay listing didn't have this info) but I bet it's like the CX-5 FWD (26.3" overall wheel diameter) picture below shows tons of empty space like it is a 26.3" diameter wheel

    http://www.ebay.com/itm/like/1918421...=ps&dispItem=1




    I might be wrong, but I think OP should have gotten the 18" rims with T155-90D18 tires.

    The 17" rims are suppose to be compact but I think OP made up the difference with thinner tire width 165mm instead of 185mm and taller sidewall tires which may or may not have been designed for that at highway speeds or quick turns....... I'm not an expert , so OP might be just fine but just doing a search showed that the CX-7 also had two types of spare tires. One for AWD (18" rims) and one for FWD (17" rims) models.
    Last edited by batmancx; 08-26-2017 at 12:29 AM.

  2. #17
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    Quote Originally Posted by batmancx View Post

    I might be wrong, but I think OP should have gotten the 18" rims with T155-90D18 tires.

    The 17" rims are suppose to be compact but I think OP made up the difference with thinner tire width 165mm instead of 185mm and taller sidewall tires which may or may not have been designed for that at highway speeds or quick turns....... I'm not an expert , so OP might be just fine but just doing a search showed that the CX-7 also had two types of spare tires. One for AWD (18" rims) and one for FWD (17" rims) models.
    You could use either the 17" or the 18" wheel. I liked the 17" better because it is wider than the 18" (5.5" vs 4") and allowed either a 165 or 185 width as opposed to the 155 width limit on the 18" wheels.
    As long as you keep the overall diameter close to 28.7", either one will work much better than the stock spare which is only 26.3".

    Both of those ebay listings look like the tires are about 10 years old, so I wouldn't want those for my spare, but if you could get the wheels only for a reasonable price and put a new 165/90R17 or 155/90R18 on them, either would work as a great alternative for the factory spare.

    If you purchase the new wheel from Med Center Mazda, the shipping is free. So if you get a used wheel and the freight knocks the price up to near $100, I would just get the new wheel if it was me.

  3. #18
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    Quote Originally Posted by bigtex View Post
    You could use either the 17" or the 18" wheel. I liked the 17" better because it is wider than the 18" (5.5" vs 4") and allowed either a 165 or 185 width as opposed to the 155 width limit on the 18" wheels.
    As long as you keep the overall diameter close to 28.7", either one will work much better than the stock spare which is only 26.3".

    Both of those ebay listings look like the tires are about 10 years old, so I wouldn't want those for my spare, but if you could get the wheels only for a reasonable price and put a new 165/90R17 or 155/90R18 on them, either would work as a great alternative for the factory spare.

    If you purchase the new wheel from Med Center Mazda, the shipping is free. So if you get a used wheel and the freight knocks the price up to near $100, I would just get the new wheel if it was me.
    Ah, good explanation, thanks for write up and good idea thanks for sharing. I'll move forward with this mod. If anything having two spares will also ease rotation of tires i like to do the "X" pattern rotation so with two spare tires it'll speed up the process somewhat.

  4. #19
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    Quote Originally Posted by bigtex View Post
    That is strange. If you go to the Mazda USA website today and look at 2016 specs, it shows this 18" spare for Sport, Touring, and GT if they are AWD.

    Here is spec for the Sport
    Wheel size (in) 17 x 7 aluminum alloy
    Tire size P225/65 R17 all season tires
    Temporary spare tire T145/90 D16 (FWD) / T155/90 D18(AWD)
    I had the same confusion like you when I was looking for some alternatives replacing smaller-diameter temporary spare too on my 2016 CX-5 AWD. I thought Mazda made a mistake from factory putting wrong spare for FWD into my AWD CX-5 which was special-ordered and picked it up immediately once it got trucked into our dealer's lot. But as stated in our owner's manual, later I verified all CX-5's, FWD and AWD, are getting T145/90D16 106M smaller-diameter temporary spare with 60 psi air pressure. I was then looking for Mexician alternative with 185/80R17 95M regular tire and 36 psi air pressure, but giving up after I found that size of tire isn't available in the US.

    BTW, the larger-diameter temporary spare - T155/90 D18 which is supposed to come with US CX-5 AWD and specified at Mazda USA website is actually having the correct overall diameter at 28.5" as our road tires. This's the spare we should get for AWD owners but didn't. It seems Mazda North American Operations don't care much about burning out AWD system while using much smaller spare tire! This's the first sign I found that Mazda or MNAO is cutting corners at every possible way and since then started finding more ⋯

  5. #20
    Registered Member yrwei52's Avatar
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    Quote Originally Posted by bigtex View Post
    Both of those ebay listings look like the tires are about 10 years old, so I wouldn't want those for my spare
    Great point! Tire ages as the years go by even we never use it. Many tire manufactures offer warranty only up to 6 years now. Yeah 10-year-old spare could be dangerous to use!

  6. #21
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    Quote Originally Posted by batmancx View Post
    Ah, good explanation, thanks for write up and good idea thanks for sharing. I'll move forward with this mod. If anything having two spares will also ease rotation of tires i like to do the "X" pattern rotation so with two spare tires it'll speed up the process somewhat.
    I personally would prefer to use T155/90 D18 as the spare for our AWD CX-5 just to match supposedly the factory spec.

    And haven't thought about the benefit of having 2 spares for "X" pattern DIY rotation.

  7. #22
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    Quote Originally Posted by yrwei52 View Post
    I had the same confusion like you when I was looking for some alternatives replacing smaller-diameter temporary spare too on my 2016 CX-5 AWD. I thought Mazda made a mistake from factory putting wrong spare for FWD into my AWD CX-5 which was special-ordered and picked it up immediately once it got trucked into our dealer's lot. But as stated in our owner's manual, later I verified all CX-5's, FWD and AWD, are getting T145/90D16 106M smaller-diameter temporary spare with 60 psi air pressure. I was then looking for Mexician alternative with 185/80R17 95M regular tire and 36 psi air pressure, but giving up after I found that size of tire isn't available in the US.

    BTW, the larger-diameter temporary spare - T155/90 D18 which is supposed to come with US CX-5 AWD and specified at Mazda USA website is actually having the correct overall diameter at 28.5" as our road tires. This's the spare we should get for AWD owners but didn't. It seems Mazda North American Operations don't care much about burning out AWD system while using much smaller spare tire! This's the first sign I found that Mazda or MNAO is cutting corners at every possible way and since then started finding more ⋯
    actually yrwei52 I think OP mod matches closer to CX-5 grand touring wheels, you can double check my math:

    CX-5 grand touring 19" wheel diameter using OEM 225/55 R19

    22.5cm/2.54 = 8.858 (conversion)
    8.858 x .55 aspect = 4.87 (sidewall height)
    overall wheel diameter = (2 x 4.87) + 19" = 28.7 " diameter



    Bigtex mod 17" wheel diameter using 165/90 R17 from Tirerack

    16.5cm/2.54 = 6.496 (conversion)
    6.496 x .90 aspect = 5.85 (sidewall height)
    overall wheel diameter = (2 x 5.85) + 17" = 28.7 " diameter



    MAZDA OEM 18" spare using T155/90 D18

    15.5cm/2.54 = 6.102 (conversion)
    6.102 x .90 aspect = 5.49 (sidewall height)
    overall wheel diameter = (2 x 5.49) + 18" = 28.98 " diameter

  8. #23
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    Quote Originally Posted by yrwei52 View Post
    I had the same confusion like you when I was looking for some alternatives replacing smaller-diameter temporary spare too on my 2016 CX-5 AWD. I thought Mazda made a mistake from factory putting wrong spare for FWD into my AWD CX-5 which was special-ordered and picked it up immediately once it got trucked into our dealer's lot. But as stated in our owner's manual, later I verified all CX-5's, FWD and AWD, are getting T145/90D16 106M smaller-diameter temporary spare with 60 psi air pressure. I was then looking for Mexician alternative with 185/80R17 95M regular tire and 36 psi air pressure, but giving up after I found that size of tire isn't available in the US.

    BTW, the larger-diameter temporary spare - T155/90 D18 which is supposed to come with US CX-5 AWD and specified at Mazda USA website is actually having the correct overall diameter at 28.5" as our road tires. [/B] This's the spare we should get for AWD owners but didn't. It seems Mazda North American Operations don't care much about burning out AWD system while using much smaller spare tire! This's the first sign I found that Mazda or MNAO is cutting corners at every possible way and since then started finding more [B]⋯
    If you think Mazda is cutting corners, you should remember that they are one of the many brands that offer a tiny cheap spare tire and then there are brands like BMW that donít even come with a spare or tire kit in the first place!

    If incorrect tire diameters is in fact bad for your AWD system, I suspect itís only for increased periods of time because the spare tire is meant to be used for a short time only. Mazda isnít the only one cheaping out like this!

  9. #24
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    Quote Originally Posted by tomcat1446 View Post
    actually yrwei52 I think OP mod matches closer to CX-5 grand touring wheels, you can double check my math:

    CX-5 grand touring 19" wheel diameter using OEM 225/55 R19
    22.5cm/2.54 = 8.858 (conversion)
    8.858 x .55 aspect = 4.87 (sidewall height)
    overall wheel diameter = (2 x 4.87) + 19" = 28.7 " diameter

    Bigtex mod 17" wheel diameter using 165/90 R17 from Tirerack
    16.5cm/2.54 = 6.496 (conversion)
    6.496 x .90 aspect = 5.85 (sidewall height)
    overall wheel diameter = (2 x 5.85) + 17" = 28.7 " diameter

    MAZDA OEM 18" spare using T155/90 D18
    15.5cm/2.54 = 6.102 (conversion)
    6.102 x .90 aspect = 5.49 (sidewall height)
    overall wheel diameter = (2 x 5.49) + 18" = 28.98 " diameter
    Calculation aside, here's the spec of overall diameter from all OE tires used on Mazda CX-5 and supposed T155/90D18 spare for CX-5 AWD. Dunlop Space Miser T155/90D18 113M tire is the spare found in CX-7 AWD and 1st-gen CX-9 AWD. They're all within reasonable 0.4" tolerance on overall tire diameter.

    Mazda CX-5 OE Tires Size Overall Tire Diameter
    Yokohama Geolandar G91A 225/65R17 100H 28.5"
    Toyo A23 225/55R19 99V 28.9"
    Yokohama Y870B T145/90D16 106M N/A (26.3" estimated)
    Dunlop Space Miser T155/90D18 113M 28.5"
    Last edited by yrwei52; 08-27-2017 at 09:15 PM.

  10. #25
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    Quote Originally Posted by yrwei52 View Post
    ...........I thought Mazda made a mistake from factory putting wrong spare for FWD into my AWD CX-5 which was special-ordered and picked it up immediately once it got trucked into our dealer's lot. But as stated in our owner's manual, later I verified all CX-5's, FWD and AWD, are getting T145/90D16 106M smaller-diameter temporary spare with 60 psi air pressure.............
    Yep, confirming what Yrwei52 said, I just checked and I'm surprised to see the small 26.3" diameter T145/90 R16 spare
    in my '16 CX-5 AWD GT with 19" wheels. i chock this up as another Mazda penny pinching with disregard to customers' cost of future repairs.

    I have owned AWD in the past and it's extremely important for AWD systems to have all the same diameter wheels, mismatched wheels will cause stress on the transfer case and cause premature failure......

    I thank Bigtex and Yrwei52 to bringing this to our attention.

    As they said, we all know the spare is only to be used for short trips but there's a chance you might be in the middle of nowhere with no auto shop near, no way I'm going to use mismatched tires on the AWD system...and another plus that Batmancx suggested, 2 spares will help with tire rotation.

    Last edited by tomcat1446; 08-27-2017 at 09:34 PM.

  11. #26
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    Quote Originally Posted by GJ-Molestor View Post
    If you think Mazda is cutting corners, you should remember that they are one of the many brands that offer a tiny cheap spare tire and then there are brands like BMW that donít even come with a spare or tire kit in the first place!

    If incorrect tire diameters is in fact bad for your AWD system, I suspect itís only for increased periods of time because the spare tire is meant to be used for a short time only. Mazda isnít the only one cheaping out like this!
    You said earlier we should get correct-sized spare. Mazda or Mazda North American Operations apparently planned to use larger T155/90D18 as the spare for CX-5 AWD originally like CX-7 and CX-9 AWD hence the spec at thier USA website. But someone had decided to cut pennies and use one-size-fit-all spare for all CX-5's, which I believe it's worse than not giving one to all AWD CX-5 owners. The AWD system will get heavy stress on clutch pack immediately once you put a much smaller spare and TPMS and TCS warning lights would be on. As bigtex said, we may need to drive over 150 miles to find a tire shop who is capable of fixing the flat properly on our CX-5 in Texas.

    No, this's the first time I encountered this issue giving a much smaller diameter spare than road tires on an AWD vehicle. My 1987 VW Vanagon Syncro、1998 Honda CR-V AWD both offer a full-sized and same alloy wheel as the spare. Mazda has been providing correct-sized temporary spare in the past on CX-7 and CX-9 AWD's, the spec at their website shows the larger-sized spare for CX-5 AWD too, why is the production change?

    I believe giving a correct-sized spare is important. But giving an incorrect-sized spare sometimes is worse than giving you a Fix-a-Flat can as it will give AWD owners more risk ruining an AWD system. As for BMW my 2000 BMW 528i does come with a full-sized spare with the same alloy wheel like the road wheels. The newer MYs don't come with a spare, but at least BMW moves the heavy battery into the spare tire well to balance the weight for performance reason.

    Quote Originally Posted by GJ-Molestor View Post
    The spare should just be the same size as the other tires just like they used to do in the 90ís.

  12. #27
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    Just FYI, if you decide to go the 18" spare wheel route, it is a narrower wheel and tire, so instead of simply removing the foam blocks mentioned earlier, you may need to trim them down the appropriate amount and leave some attached to where the rear floor rests on the new width spare. I personally like the 17" wheel option because you can go with a 165 width, which gives you a little more rubber on the road, and because of the wheel width, you only have to remove the foam blocks instead of cutting them down to fit. I have not tried the 18", so not sure how it will fit exactly. Also, the 17" option gives an exact diameter match of 28.7", but anything real close will be much better than the almost 2.5" difference in the stock spare if you need to use it.
    Last edited by bigtex; 08-27-2017 at 10:32 PM.

  13. #28
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    Quote Originally Posted by bigtex View Post
    Just FYI, if you decide to go the 18" spare wheel route, it is a narrower wheel and tire, so instead of simply removing the foam blocks mentioned earlier, you may need to trim them down the appropriate amount and leave some attached to where the rear floor rests on the new width spare. I personally like the 17" wheel option because you can go with a 165 width, which gives you a little more rubber on the road, and because of the wheel width, you only have to remove the foam blocks instead of cutting them down to fit. I have not tried the 18", so not sure how it will fit exactly. Also, the 17" option gives an exact diameter match of 28.7", but anything real close will be much better than the almost 2.5" difference in the stock spare if you need to use it.
    I agreed with you getting T165/90D17 temporary tire is a better alternative as a spare for our CX-5 AWD with the reasons you mentioned. And may I add a couple of more reasons for you: the tire with that size has more choices and is cheaper too. At Tire Rack, T165/90R17 116M Kumho T121 weighted 18 lbs costs $79.10 each and T165/90D17 116M Kumho T131 weighted 15 lbs costs $75.22 each; whereas T155/90D18 113M Dunlop Space Miser, and that's the only tire for that size available, weighted 16 lbs costs $109.46 each.

    BTW, any reason why you chose Kumho T121 instead of Kumho T131?

  14. #29
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    Quote Originally Posted by yrwei52 View Post
    I believe giving a correct-sized spare is important. But giving an incorrect-sized spare sometimes is worse than giving you a Fix-a-Flat can as it will give AWD owners more risk ruining an AWD system. As for BMW my 2000 BMW 528i does come with a full-sized spare with the same alloy wheel like the road wheels. The newer MYs don't come with a spare, but at least BMW moves the heavy battery into the spare tire well to balance the weight for performance reason.
    I second this sentiment, better to not give me a spare tire if it's the wrong size and give me a false sense of security. I think most AWD owners wouldn't even know they are driving around with mismatched spare. Wrong wheels on AWD is a recipe for damaged transfer case, hell even not rotating tires or tightening lugs without a torque wrench is enough to cause stress on the transfer case like the gen 1 CX-9's.

  15. #30
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    Quote Originally Posted by yrwei52 View Post

    BTW, any reason why you chose Kumho T121 instead of Kumho T131?
    I think it had a slightly wider tread width, maybe 1/2", that I thought would be beneficial.

    On another note, if you have the bose subwoofer, there is a hold down bolt that goes through the center of the unit that sits on top of the spare and holds both the speaker and the spare in place. It looks like this (sorry for the huge pic):



    With the wider 17" steel wheel, the bolt is not long enough and will barely grab any threads if you can get it to grab at all. I lengthened the threads with a coupling nut and some threaded rod. Size you need is M8 X 1.25. You can cut a piece of the threaded rod to the length you will need, but you will have to experiment to get the right length and probably need to file the cut ends a little. Once you have it, use some blue loctite and let it sit overnight to set up and you should be good to go. If you make it a little long, you can use some washers between the bolt head and the bose speaker to make up some room. I used a couple of hose washers and it works great.
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