Steep driveways, and where a tire van can actually work in Chattanooga

Every mobile tire company in the country says it comes to you. Almost none of them tells you where it cannot work, which in this county is the more useful half of the sentence. This page is that half.

The industry's own bar, in its own words

Tire Rack publishes its mobile installation requirements plainly, and we are going to quote them rather than paraphrase, because they are the clearest statement of the physical minimum anyone in this trade has put in writing:

"Safe location We need a safe place to install your tires. We cannot install in open traffic, but we can meet you at your residence or a local parking lot. Appropriate Space We require a flat, paved surface with 6 feet of clearance around your vehicle along with enough space for our installation van. A minimum of 10 feet of vertical clearance is also required."

It goes on to require healthy lug nuts, serviceable wheels and a wheel lock key, and warns: "I understand that if these requirements are not met, my appointment may be canceled at the time of installation."

Flat. Paved. Six feet all round. Ten feet of headroom. Now look at the ground here.

What the county's own GIS says about the ground

The City of Chattanooga's open data hub publishes a feature service called Hamilton Slopes, whose layers are cut at fixed slope thresholds. Summed over every polygon in each layer on 2026-09-20:

Slope threshold	Polygons	Acres
15 percent or steeper	31,417	122,418
20 percent or steeper	36,659	86,169
25 percent or steeper	32,052	58,426
30 percent or steeper	22,940	38,854
35 percent or steeper	18,311	25,599

Hamilton County's land area is 542.164 square miles, from the 2024 Census Gazetteer. Against that:

• 122,418 acres is 191.3 square miles, 35.3 percent of the county (DERIVED: 122,418 divided by 640 gives 191.3; 191.3 divided by 542.164 gives 35.3 percent).
• 58,426 acres is 91.3 square miles, 16.8 percent (DERIVED, same arithmetic).
• 25,599 acres is 40.0 square miles, 7.4 percent (DERIVED, same arithmetic).

Roughly a third of the county, by its own mapping, is at a grade of 15 percent or steeper.

Two honest caveats, because a number this useful deserves them. First, those percentages are our arithmetic over the city's published layer, not a figure the city publishes. Second, the ArcGIS item behind the layer, created 31 October 2023, carries an empty description, empty tags and no credits: nothing states which elevation model the slope classes came from, at what cell size, or whether the polygons are clipped to the county line or exclude water. If they are not clipped, the percentages are inflated. We are showing you the inputs so you can discount them yourself.

There is no slope figure for your neighbourhood, and we are not going to make one up

This is the single most tempting number on any Chattanooga tire page and it does not exist.

We tried to cut the county slope layer to ZIP Code Tabulation Area boundaries and the query overcounts grossly, because the slope polygons are large and run well past any neighbourhood boundary. Summing the polygons that merely intersect the Lookout Mountain ZCTA returns 2,891 acres of 15-percent-or-steeper ground inside an area that has only about 859 acres of land in total. A correct per-neighbourhood figure needs a real geometric clip, which the published query interface will not do.

So if you read that some named Chattanooga neighbourhood is "X percent steep", somebody invented it. We are not going to, and you should discount anyone who has.

What is measured is the elevation at named points

The USGS elevation service returns a real elevation at a real coordinate, and those we can publish. All read 2026-09-20 at one-metre resolution:

Place	Elevation
Market Street at 8th, downtown	676.5 ft
Tennessee River bank at Ross's Landing	677.0 ft
Frazier Avenue, North Shore	651.7 ft
Chattanooga Lovell Field	669.8 ft
Crest Road on Missionary Ridge, at the Sherman Reservation	750.0 ft
Signal Point, Signal Mountain	1,801.1 ft
Point Park, Lookout Mountain	2,037.0 ft

Downtown to Point Park is a rise of 1,360.5 feet (DERIVED: 2,037.0 minus 676.5, both USGS point reads on 2026-09-20). Downtown to Signal Point is 1,124.6 feet (DERIVED: 1,801.1 minus 676.5).

And here is the corrective that this city's own residents tend to be surprised by: Missionary Ridge stands only 73.5 feet above downtown at the point we sampled (DERIVED: 750.0 minus 676.5). The ridge that runs through the eastern neighbourhoods is a low ridge. The mountains are the tall ones. If you live on the ridge, your driveway may be perfectly workable; if you are halfway up Lookout, it may not be.

One thing those numbers are not: gradients. They are point elevations at coordinates we chose, not summit heights, not neighbourhood averages, and two of them cannot be divided into a slope without a road profile. We are not going to do that and neither should anyone quoting this page.

The data that does not exist at all, and why it matters here more than anywhere

Tire Rack's requirement is a flat, paved surface. The obvious question is how many Chattanooga homes have one.

Nobody knows. The American Community Survey carries no garage, driveway or off-street-parking variable, and Chattanooga publishes no equivalent dataset. The nearest proxy available is the share of homes that are one-unit detached, which for the City of Chattanooga is 57.6 percent, and a detached house is not the same thing as a paved level driveway.

We flag that gap here rather than papering over it, because in this particular market it is the gap that matters most. In a flat city the paved-surface requirement is a formality. Here it is the booking.

One more surface fact that is measured, and it sits on the Georgia side of the metro. Mobile homes as a share of housing units: Dade County 17.6 percent, Walker County 13.8 percent, Catoosa County 9.0 percent, against 15.6 percent in Soddy-Daisy on the Tennessee side. A mobile home lot is very often not a paved driveway. If we are asked to cross the state line, the surface gets checked rather than assumed.

What we actually need, and what happens if it is not there

Plain version:

• Level ground. Not perfectly flat, but level enough that a jacked car is safe and a wheel is not rolling anywhere.
• Paved. Gravel, dirt and grass are not safe to jack a car on. Hardstanding.
• Legal. Your own driveway, your workplace car park with permission, or a legal space. Not a live traffic lane and not somewhere we will be moved on from halfway through.
• Room at one corner. Not the whole driveway. One corner of the car with room for a technician and a machine to work.
• Headroom. A carport or a low garage can be the problem rather than the slope.

Tell us what you have when you book, including the awkward bits. If we get there and the space is not safe to work in, that visit is not charged. We would far rather establish it in a two-line message than in your driveway.

If the answer is genuinely no — a parking deck with low clearance, a mountain driveway at a grade we cannot jack on — the honest outcome is that you take the car somewhere flat, either to a level spot nearby that we can meet you at, or to one of the twelve fixed shops in the Tire Rack directory for this market. We will say so rather than send a van to find out.

What this looks like in specific places

A few things are measured and worth knowing if you are on the high ground. Signal Mountain town is 89.5 percent one-unit-detached housing with a 27.5-minute mean commute and 26.1 percent of its workers at home. Lookout Mountain town is 94.5 percent owner-occupied, with 30.5 percent of households keeping three or more vehicles. St Elmo, at the foot of Lookout, has the longest mean commute of the fourteen Chattanooga ZCTAs in our research at 27.2 minutes, and its Census internal point lands at 1,172 feet — on the mountain rather than on the valley streets, which is a good illustration of why a single point elevation is not a neighbourhood.

Ranking population for that commute statement: the fourteen ZIP Code Tabulation Areas profiled in our Chattanooga research file, and no others.

Our price: $145 for the first tire

A mobile puncture repair on one tire is $145, and $50 for each additional tire in the same visit, with no separate call-out fee. For a replacement we supply the tires and fit them at the same visit; we do not mount tires bought elsewhere and we do not sell used tires. Wheels up to 22 inches, one to four tires in a visit, TPMS reset included where the vehicle supports it at the roadside.

Seasonal changeover is bookable at $350 for a set already on its own wheels and $390 for loose tires that have to be mounted on the same wheels and balanced. We are not storing your off-season set in Chattanooga: storage is resold through a local partner at $150 a set for a six-month season, and no partner here has yet cleared the building, rate, insurance and retrieval checks we require, so it is not on sale.

If the tire cannot be repaired, the inspection is charged and the repair is not. If the space is not safe to work in, nothing is charged.

Where to go next

Mountain roads and tire safety covers Lookout and Signal properly, mobile tire repair in Chattanooga covers the visit, pothole damage covers what the roads do to a tire, and what it costs covers the money. Tennessee against Georgia matters if you cross the line.

Nationally: how to prepare for a mobile tire visit, a flat in the driveway, a flat at work, mobile versus a tire shop, seasonal changeover, where tire storage is and is not on sale and how it works. Our Chattanooga service area has the coverage.

Questions people ask

• My driveway is on a slope. Can you still come? Sometimes. What matters is whether there is a level, paved spot with room to work at one corner of the car, not the average grade of the property. Send us a description or a photo when you book.
• How steep is Chattanooga really? The city's published county slope inventory puts 122,418 acres at 15 percent grade or steeper, which against Hamilton County's 542.164 square miles of land is 35.3 percent of the county by our arithmetic. Roughly a third.
• How steep is my neighbourhood? Nobody publishes that, and the query that would produce it overcounts badly. We will not print a neighbourhood slope figure and we would treat anyone who does with suspicion.
• Do I need a garage? No. You need level, paved, legal ground with room at one corner of the car. A garage or carport can actually be the obstacle, since the industry requirement is ten feet of vertical clearance.
• What if you turn up and can't work there? The visit is not charged. That rule exists precisely because this is a hilly county.
• Can you work at my office car park? Usually, with the property's permission and a legal space. That is one of the most common places we fit.