Spare Tire in the trunk fitment

[mp33dave]

Well, I see why Audi used a small temp tire as a spare vs using a full sized with matching rim. The full size rim and tire doesn't fit in the spare tire wheel well. I sort of knew this going into buying the rim and installing new rubber but thought it might be off by just a little - wrong. I really dislike using a temp tire vs full size. If I have an issue and I'm traveling, I don't want to mess with getting the damaged tire fixed or replaced. So now I have the full size in my trunk taking up some valuable space. I will assume that others are doing the same? I was thinking of a way to cut out a hole in the trunk floor cover/panel and just have the top half of the tire sticking up. And maybe even using that circle that was cut out and fashion up some sort of cover built into that cardboard cover.

I know its a crude drawing but you get the hint. The cover would be integrated with the trunk floor cover.



Do most just suck it up and use that dinky spare?

[ayoo456]

Yea I just use the 20" donut

Galaxy S7

[mp33dave]

so the 20 inch donut is equivalent to the 18in wheels I have from the factory?

[PKmode]

You have to understand Audi perspective. This is for emergency use only. That's why it says 50 miles or 50mph. It is not even a temporary fix. Audi discourages you from even jacking up the car if you look in your manual.

Personally, I have towing on my insurance if needed.

[Thisisnoise]

Btw don't ever use the spare if you have painted calipers - just happened to me and scuffed them up


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[MadAboutCars]

Btw don't ever use the spare if you have painted calipers - just happened to me and scuffed them up


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Buy a set of spacers and use it when you fit the spare.

[name.goes.here]

You have to understand Audi perspective. This is for emergency use only. That's why it says 50 miles or 50mph. It is not even a temporary fix. Audi discourages you from even jacking up the car if you look in your manual.

Personally, I have towing on my insurance if needed.

This. Spare is only intended to get you somewhere safe and have the damage tire repaired, not for daily use.

[Don Draper]

I can't imagine wanting to lug around all the extra weight of a full size.

[mp33dave]

I can't imagine wanting to lug around all the extra weight of a full size.

difference is like 10lbs. I couldn't image waiting for a tow truck to fix something that I could have done in 10min and be on my way. I would absolutely hate putting on a ill sized spare that could wreak havoc on my Quattro. To each his own I guess.

[Don Draper]

difference is like 10lbs. I couldn't image waiting for a tow truck to fix something that I could have done in 10min and be on my way. I would absolutely hate putting on a ill sized spare that could wreak havoc on my Quattro. .

.

Why would I need to wait for a tow truck if I already have a spare? The car isn't designed for a full size spare. Frankly I was pleasantly surprised to find it had one at all.

[Kevin1]

Over the years I have put approximately 700,000 miles on my vehicles and have had zero flats. I am not going to lose much sleep on whether the spare is a full size or a temporary.

[simonaitch]

I shredded a front between Mojave National Preserve and Sheephole Valley Wilderness. No spare, Thanksgiving friday, no cell phone reception. It was an unpleasant experience.

[fatherdeath]

I had a full size 18 on my b6 S4 but i never used it once in 4 years

[Barritia]

So if we have to have tires within 3mm of each other's size how on earth does the spare work when it's way smaller. Thought it was a big no no reason being different size tires on the Quattro cars.

[RAF_S7]

The skinny spare is for temporary use only. Its designed to get you to a tire repair shop, not for finishing your 300 mile road trip.

Its good for 50mph, and around 50 miles of travel.

A lot of modern new cars dont even come with a spare, you get a can of compressed goop you inject into the tire.

BTW, the skinny spare is matched to the circumference of the original tires. Having 18" alloys does not mean you have an 18" diameter wheel and tire combination. You have to add the tire sidewall depth to get the actual rolling diameter.

Driving for 50 miles with mismached tire diameters by a few mm, is not going to damage your quattro system

In my 37+ years of driving, ive never had to use a spare.

[mp33dave]

I wish I was that lucky to have never had a flat, ever. There has been several times traveling that I either picked up a nail or had hit something (pothole) that caused a flat. Its so nice to be able to put on a extra rim and tire that match and worry about fixing the bad one when I get home.

[SlickMachine]

I'm considering pulling the spare out of my A7 and carrying a few cans of fix-a-flat, or their kit instead. I estimate the spare weighing 30 pounds or so. I know fix-A-flat is bad for tpms and doesn't always work, but AAA is my backup. #weightsavings.

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[GolfGL]

I'm considering pulling the spare out of my A7 and carrying a few cans of fix-a-flat, or their kit instead. I estimate the spare weighing 30 pounds or so. I know fix-A-flat is bad for tpms and doesn't always work, but AAA is my backup. #weightsavings.

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TPMS on the newer Audis is based off the ABS sensors and doesn't have actual TPMS sensors in each tire.

[RAF_S7]

TPMS on the newer Audis is based off the ABS sensors and doesn't have actual TPMS sensors in each tire.

Not entirely true. The RS models still have TPMS fitted, with sensors in the tires.

The other models, including the S6/7 use the ABS method.

[GolfGL]

Not entirely true. The RS models still have TPMS fitted, with sensors in the tires.

The other models, including the S6/7 use the ABS method.

Didn't know that, thanks!

[SlickMachine]

Not entirely true. The RS models still have TPMS fitted, with sensors in the tires.

The other models, including the S6/7 use the ABS method.

What exactly, or how exactly, does the ABS method work?

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[GolfGL]

What exactly, or how exactly, does the ABS method work?

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From wikipedia:

Indirect TPMS do not use physical pressure sensors but measure air pressures by monitoring individual wheel rotational speeds and other signals available outside of the tire itself. First generation iTPMS systems are based on the principle that under-inflated tires have a slightly smaller diameter (and hence higher angular velocity) than a correctly inflated one. These differences are measurable through the wheel speed sensors of ABS/ESC systems. Second generation iTPMS can also detect simultaneous under-inflation in up to all four tires using spectrum analysis of individual wheels, which can be realized in software using advanced signal processing techniques. The spectrum analysis is based on the principle that certain eigenforms and frequencies of the tire/wheel assembly are highly sensitive to the inflation pressure. These oscillations can hence be monitored through advanced signal processing of the wheel speed signals. Current[when?] iTPMS consist of software modules being integrated into the ABS/ESC units.

[SlickMachine]

^^ I got lazy on that one. Thx.

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[RAF_S7]

ABS or Passive TMPS

The ABS technology measures if a tyre is rotating or not, and can compare that rotation against the other wheels. If everything is operating in sync, then the ABS is not activated. If one or more wheel locks up, then ABS forces the brake on that corner to release and quickly be reapplied, so preventing the wheel locking up and skidding.

If you apply the same technology to tire pressure - then if tires are inflated to a specific pressure, then the diameter of the tire is set (when you push the pressure set button) via the MMI at a given pressure.

If that pressure then drops (leaks) then the diameter of the tire shrinks as its got less air inside. Clever electronics identify the tire moving faster than it should and raise that as a low pressure alarm on the dash. Passive TMPS is not as accurate as the active, and you may only get an alarm raised when the pressure drop is 20% or more.

Active TPMS

Uses a battery operated remote temperature and pressure sensor transmitter located on the valve of each wheel. There is a TPMS receiver located somewhere in each wheel well.

The active TMPS will display the actual tire pressure and temperature (system dependent) of each wheel, and will instantly alert if the pressure drops below a preset level. Its much more accurate than the passive or ABS method.