4x100 spare tire

4x100 spare tire DEFAULT

Quote:

Originally Posted by BabyDieselView Post
It should be noted that 1 pound of rotational mass is equivalent to 8 pounds of car mass. In kilos, 0.5 kg RM = 4 kg

In essence, it would make the car accelerate as if he had lost around 64 pounds of car weight.
Sorry, but that is not true, not for wheels anyway.
I was hoping to find a simple equation but wikipedia is no fun: https://en.wikipedia.org/wiki/Rotational_energyand https://en.wikipedia.org/wiki/Rigid_rotor...
Equations galore, but not simple.

You can simplify the model by substituting the whole wheel with a point mass.
The energy contained by the rotational mass is equivalent to the speed with what that mass moves along its trajectory; radius and the speed of the whole system are irrelevant, e.g. the effect is the same with big and small wheels, and the rotational energy in the system is independent of the movement; it would be just the same if it were spinning its wheels on ice.

The fastest moving part of the wheel is the tire thread; it rotates at the same speed as the car, so it has the same momentum. It doubles the total inertia, once for its general movement, once for its rotation.
The rim is closer to the center of rotation so it contributes less to the total inertia.
In all, a wheel will add about 1 2/3 of its weight to the total inertia.
The engine and gearbox parts may rotate much more quickly; they can easily add more than their weight in rotational mass.

However, wheel weight is unsprung weight. On rough roads extra wheel weight adds a lot to the rolling resistance, as every bump in the road will have to move more mass out of the way.
Under the right conditions extra unsprung weight can increase the resistance 8 times more than sprung weight, or more. For that reason alone light wheels are recommendable.
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MX-5 Miata Forum > ND (2016+) Miata > ND Tires/Wheels > Will a space-saver spare fit the ND, and will it fit in the trunk?


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Clermontnick

17th August 2015, 14:26

I think I've read all the posts regarding the lack of a spare tire in the ND (the pros and cons of plugs, buying run-flats, air compressors, calling AAA, etc) and don't need to go back down that road. I also see that this is a sensitive subject to some people, and I don't want to open old wounds.

I just want to know if there's any size space-saver spare that will (A) fit the ND, and (B) also fit in the trunk. I live in a rural area where cell phone coverage is spotty, so AAA isn't an option I can always count on. I've also had terrible luck with getting flat tires that simply cannot be fixed with a plug kit and/or tire goo, like sidewall damage and cuts. Run-flats could be my only solution, but I have to consider both cost and ride quality. Also, my wife sometimes drives the car solo, and I don't want her stranded in the boonies and having to count on the mercy of strangers. Bottom line: I'd really like a spare wheel/tire in the trunk if at all possible.

I have the feeling I won't like what I will hear, but I just want to know if anyone has tried to mount a 4x100 donut, of any size, on an ND, and had any luck. I'm just exploring options.

Thanks.

PS--Vendors, are you listening? I smell customers!


huveu

17th August 2015, 17:48

Mark Booth posted a picture of the NB's 16" spare wheel/tire fitting in the trunk of the ND. However, the wheel wouldn't clear the ND's brake calipers.


Clermontnick

17th August 2015, 18:12

huveu:

Many thanks for your update; I obviously missed Mark'a entry. As I stated in my initial post, I expect to be disappointed early on, and can only hope some vendor steps up to fill the void in what I believe is a rather large customer base. I sincerely doubt I'm the only one out there who'd like a spare in the "boot."

Time will tell.


Mark Booth

18th August 2015, 00:18

Mark Booth posted a picture of the NB's 16" spare wheel/tire fitting in the trunk of the ND. However, the wheel wouldn't clear the ND's brake calipers.

For the record, the NB's space saver spare is not a 16" wheel. It's a quite bit smaller than that and using one on an NB results in a car that rides lower at that corner.

But, as you point out, it's a moot point. The NA/NB space saver spare won't clear the ND's larger brake calipers.

Mark


Clermontnick

18th August 2015, 05:44

Mark:

Thanks for that info.

Okay, a Miata (NA/NB/NC) space saver spare won't work. Are there other options? What about a spare from a Mini, a Fiat 500, earlier Hondas, or another make? I have no particular brand loyalty, I only want something that will fit on an ND, and in my trunk.


supasparky

18th August 2015, 19:41

I heard a rumour that 949 will be making a 4" wide 6ul just for this purpose. haha


MikeyTX

22nd August 2015, 22:46

Mark:

Thanks for that info.

Okay, a Miata (NA/NB/NC) space saver spare won't work. Are there other options? What about a spare from a Mini, a Fiat 500, earlier Hondas, or another make? I have no particular brand loyalty, I only want something that will fit on an ND, and in my trunk.

Do yourself a favor and buy the kit that Mark Booth has. One of our vendors put it together for him and now sell it otc so to speak. I do not recall who or the price so Mark will have to supply that information.


supasparky

24th August 2015, 04:46

so by how much does it not clear the caliper? there are PLENTY of thick spacers available on ebay ay 25-30mm. bolt on spacer then bolt space saver to hub...ok for a short trip


MikeyTX

24th August 2015, 07:09

Don't drive the car very far do you ?


Mark Booth

24th August 2015, 09:39

so by how much does it not clear the caliper? there are PLENTY of thick spacers available on ebay ay 25-30mm. bolt on spacer then bolt space saver to hub...ok for a short trip

The spacer would have to be longer than the lugs!! In other words, what you propose is not physically possible.

Mark


supasparky

25th August 2015, 06:37

bolt it on backwards. ;)

no seriously im sure you could make something up if you REALLY wanted a spare like getting a 3 piece BBS or similar wheel and fitting two thin rings to it to make a narrow wheel??

the stance guys are always pulling apart 3 piece wheels. im sure theyd know how to make a skinny up.

bolt up a 1" outer lip in place of the inner lip, fit space saver tire and bolt it up (probably need a spacer on the hub to clear the brakes.)
http://www.tunershop.com/Wheel_accessories/Outer_Lips/BBS/


ben1364

3rd September 2015, 10:21

huveu:

Many thanks for your update; I obviously missed Mark'a entry. As I stated in my initial post, I expect to be disappointed early on, and can only hope some vendor steps up to fill the void in what I believe is a rather large customer base. I sincerely doubt I'm the only one out there who'd like a spare in the "boot."

Time will tell.

I wonder what the potential market for a spare wheel/tire for the ND might be. How often have you had flat tires in recent years? Even the donuts and folding spare tires and steel wheels add weight...


Ptoman

3rd September 2015, 13:58

Do yourself a favor and buy the kit that Mark Booth has. One of our vendors put it together for him and now sell it otc so to speak. I do not recall who or the price so Mark will have to supply that information.

Mark,MikeyTX,
Is there a link to the tire kit?


Mark Booth

4th September 2015, 00:38

Mark,MikeyTX,
Is there a link to the tire kit?

I ordered my kit from Mazmart. Start reading here and go forward from there:

http://forum.miata.net/vb/showthread.php?p=7591154#post7591154


Mark


Philipb

4th September 2015, 03:32

Hi everyone. Just a thought, I think perhaps the question should be, can you get the existing road wheel in the trunk, once you've replaced it with the space saver. I kinda went down this route with an NC2.


pbe624

4th September 2015, 04:25

Hi all,

I was also a bit concerned with lack of spare tire, having had a Mercedes SLK with the glue-fix option, which did not work at all when I had to use it... .

I think the solution is probably not just a small spare tire, but also a version which is inflatable (see picture) rather than an already inflated smaller tire, since all Miatas have the air compressor to inflate it.

This also means having the jack kit in the trunk of course.

I think the bad tire would fit in the trunk once deflated, but maybe one of the current owners could do the test :-)

Cheers,
Frank


__vladster__

9th September 2015, 05:45

Hi all,

I was also a bit concerned with lack of spare tire, having had a Mercedes SLK with the glue-fix option, which did not work at all when I had to use it... .

I think the solution is probably not just a small spare tire, but also a version which is inflatable (see picture) rather than an already inflated smaller tire, since all Miatas have the air compressor to inflate it.

This also means having the jack kit in the trunk of course.

I think the bad tire would fit in the trunk once deflated, but maybe one of the current owners could do the test :-)

Cheers,
Frank

Smart, very smart. Why didn't I think of that? I've had a full-size spare for my NC sitting in my garage, just in case. But I could never manage to fit it in the trunk - the problem was with the fuel hose protective shield and the trunk opening. Some modification would have to be done to make a fully-inflated spare fit. I'll try deflating.

Any idea how much you can deflate the stock tires before they start coming off the rim?


pbe624

10th September 2015, 04:46

Hi Vladster,

don't know about your question related to how much you can deflate a 'standard' tire... .

The one in my picture is not a deflated standard tire but an 'emergency' tire/wheel, with speed restrictions (usually max 90km/h). Therefore, it will be of help getting you to a location where you can fix or buy a new tire for your original rim, but is not intended for ongoing road use.

If your standard tire has gone, then I think it should fit (fully deflated) in the trunk so no need to leave it by the side of the road.

P.S. I would also carry in the trunk one of those plastic covers for wheels, so that the bad tire , full of road debris & mud, does not destroy the lining in the trunk (which I read somewhere is quite fragile..)

Still waiting to hear if anybody has a model with 4 holes that will fit the ND...

Cheers,
Frank


russ in va

17th September 2015, 22:32

The spacer would have to be longer than the lugs!!
Mark
That's commonly done. This type of spacer is typically called a hub adapter.

http://www.ebay.com/itm/2-1-inch-Hubcentric-Wheel-Spacers-4x100-54-1mm-Hub-Fits-Toyota-Mazda-Scion-/251656411524

Also available to allow fitment of a spare with a different bolt pattern, 4 x 114.3 (4.5"):
http://www.amazon.com/4x100-4x114-3-Spacers-Adapters-Integra/dp/B00CHW6RU6

Or even 5 lug: (allowing use of spares from mustang, 350z, and many other cars with large brakes, though they might not fit in the trunk)
http://www.ebay.com/itm/4x100-to-5x4-5-4x100-to-5x114-3-4x4-25-4x108-to-5x114-3-Wheel-Adapters-x-4-/161683819849?hash=item25a51b4d49&vxp=mtr


Ozemexfive

31st March 2016, 06:23

Holy thread resurrection, Batman!

Just wondering if anyone has come up with a workable solution.

Would be useful to take along on trips to remote areas, where there is no mobile phone coverage - plenty of such areas in Australia!


bill keksz

31st March 2016, 06:44

Hi all,
...
I think the solution is probably not just a small spare tire, but also a version which is inflatable (see picture) rather than an already inflated smaller tire, since all Miatas have the air compressor to inflate it.
...
Cheers,
Frank

Are those spares still available? I remember them being common in the '70’s.


Patrick3000

6th April 2016, 21:03

so by how much does it not clear the caliper? there are PLENTY of thick spacers available on ebay ay 25-30mm. bolt on spacer then bolt space saver to hub...ok for a short trip

X2


randmness

7th April 2016, 10:38

A space saver tire will fit into the trunk.

A deflated 17" wheel should also fit into the trunk.


AFnJ

28th April 2016, 20:10

I have not tested my theory but the spare tire kit for a current model Kia Rio SX looks like it might work. Just like the ND the Kia had 4x100 bolt pattern, a stock tire size of 205/45R17, and a 11" disc brakes. I know the deciding factor is the thickness of the brake caliper but maybe someone is willing to make a $200 gamble to find out.


Chas H

28th April 2016, 20:13

A space saver tire will fit into the trunk.

A deflated 17" wheel should also fit into the trunk.

Have you tried to put a 17" road tire in the trunk?


randmness

28th April 2016, 22:35

Have you tried to put a 17" road tire in the trunk?

Nope. The spare I have now, when fully inflated, just barely clears the trunk opening. It's a 16" spare (125/70/16) and it clears the front non-Brembo brakes. I'm not sure of any spare that would clear the Brembos.

With that being said, you may be able to fit the standard 17" wheel in the trunk. However, it would most likely have to be somewhat deflated though. The ND 17" (without tire) fits into the trunk no problem.


BriceP

9th May 2016, 11:36

Nope. The spare I have now, when fully inflated, just barely clears the trunk opening. It's a 16" spare (125/70/16) and it clears the front non-Brembo brakes. I'm not sure of any spare that would clear the Brembos.

With that being said, you may be able to fit the standard 17" wheel in the trunk. However, it would most likely have to be somewhat deflated though. The ND 17" (without tire) fits into the trunk no problem.

Where did you get the spare tire from? I got stuck on the side of the road this past weekend after I shredded a tire.


randmness

9th May 2016, 13:05

Where did you get the spare tire from? I got stuck on the side of the road this past weekend after I shredded a tire.

Ebay. I think I paid $70 shipped.

Examples:
http://www.ebay.com/itm/03-04-05-06-07-AERIO-WHEEL-16X4-SPARE-AWD-16-DONUT-125-70-16-334784-/121615324725?hash=item1c50d69635:g:xTEAAOSwKIpWDDl D&vxp=mtr
http://www.ebay.com/itm/03-04-05-06-07-AERIO-16-COMPACT-SPARE-WITH-TIRE-125-70-16-/230964519165?hash=item35c68ee0fd:g:MfsAAOSwiwVWT1Y F&vxp=mtr

You could probably pick up one from a local junk yard as well.

The only vehicles I found that had the same bolt pattern (4x100), and came with 16" spares, were early 2000's Civic Si and the Suzuki Aerio. There may be others though.


Max MX5

9th May 2016, 14:01

I bought a 16 inch space saver spare for a Toyota/Scion, 4X100, 125/70/16, and it fits front and back hubs, non-Brembo, and easily clears the calipers. It also fits into the trunk. I have it for trips, otherwise it sits in my garage and I carry a plug kit for normal driving.
I have a 17 inch space saver for my 14 Club and it will fit the Club's trunk but will not fit into the ND trunk.


randmness

9th May 2016, 14:06

I bought a 16 inch space saver spare for a Toyota/Scion, 4X100, 125/70/16, and it fits front and back hubs, non-Brembo, and easily clears the calipers. It also fits into the trunk. I have it for trips, otherwise it sits in my garage and I carry a plug kit for normal driving.
I have a 17 inch space saver for my 14 Club and it will fit the Club's trunk but will not fit into the ND trunk.

Sounds good.

You definitely don't want to use the spare on the rear.


Cross Creek

26th May 2016, 17:13

If you're just going from the breakdown location to the nearest tire shop (or home), would you really have to close the trunk lid with the damaged wheel/tire inside? Surely it will fit standing up.

If history is any guide, I'm more likely to get a flat near home than on the highway. I wouldn't have room for both a mini-spare and luggage anyway, but might carry a spare around town if I had one... I did just get back from a 5000 mile round trip on which I carried only the Mazda compressor/Slime and a Dynaplug kit. No flats, but the stock Bridgestones were pretty new when I started (noticeably worn now).


Mb460

5th November 2017, 11:33

Mark Booth posted a picture of the NB's 16" spare wheel/tire fitting in the trunk of the ND. However, the wheel wouldn't clear the ND's brake calipers.

Did he try turning the wheel backwards? Not ideal, but gets you going in a pinch if it would work...... ? Serious question, because I find myself in the same train of thought and not wanting to be stranded somewhere.


Bimmer

6th November 2017, 22:03

I wonder what the potential market for a spare wheel/tire for the ND might be...

None. See below...


I ordered my kit from Mazmart...

Used parts/jacks are cheaper...


Ebay. I think I paid $70 shipped.

Getting closer...


I bought a 16 inch space saver spare for a Toyota/Scion, 4X100, 125/70/16...

Winner!

I paid $20 cash for one at the local junkyard.


Richard Dekker

6th November 2017, 22:05

What model Toyota / Scion?


ND2017

6th November 2017, 23:58

What model Toyota / Scion?

Early 2000s Toyota Prius and Scions (yellow color spare rims) with 4x100 bolt patterns or last few years Prius C (black color spare rims). Size is 125/70/16. I recently picked one up from eBay for $75 from a 2014 Prius C, fresher rubber than the early 2000s. ;)


Bimmer

7th November 2017, 02:27

Really, try a local junkyard...

It's much cheaper, it's quicker, and you'll meet interesting people there!


ND2017

7th November 2017, 03:05

Really, try a local junkyard...

It's much cheaper, it's quicker, and you'll meet interesting people there!

It's the price for convenience... but the interesting people part does sound interesting. :D


SoulRedND

7th November 2017, 03:19

Hmm..i have a spare tire doughnut from a ford fiesta...I should try to test fit it. It fits in the trunk...just need to see if it clears the brembos up front. Can't do that at the moment.


CazSL

18th January 2018, 02:11

Resurrecting this thread again because I've been thinking of the spare wheel question. My other car is a 2016 Mazda 2 Sedan (sold in the US as the Scion iA/Toyota Yaris iA) and it has a 4x100 bolt pattern with 16 inch wheels and has a space saver spare. I assume the spare should fit the Miata, going to try it out sometime soon. Will update this thread when I do.


tractng

18th January 2018, 03:46

Resurrecting this thread again because I've been thinking of the spare wheel question. My other car is a 2016 Mazda 2 Sedan (sold in the US as the Scion iA/Toyota Yaris iA) and it has a 4x100 bolt pattern with 16 inch wheels and has a space saver spare. I assume the spare should fit the Miata, going to try it out sometime soon. Will update this thread when I do.

Please do so. I hate the idea of taking a trip that is over 200 miles. Even though i have BBK in the front, I can always swap to the rear if the front tire goes bad.


early onset midlife?

28th January 2018, 01:13

https://forum.miata.net/vb/showthread.php?t=645692


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