You love your 2017 Honda Civic Si. It’s a nimble, engaging, and genuinely fun car to drive, whether you’re carving canyons or just commuting. But let’s be honest, your Si is only as good as its connection to the road – and that connection comes down to your tires.
Many drivers overlook the critical role tires play in their vehicle’s performance, safety, and even fuel economy. Choosing the wrong size or type can compromise everything you love about your Si.
At FatBoysOffroad, we understand that getting your setup right is key. This comprehensive guide will dive deep into the 2017 Honda Civic Si tire size, exploring everything from stock specifications to performance upgrades, essential maintenance tips, and even eco-friendly options. By the time you’re done, you’ll be equipped with the knowledge to make informed decisions and keep your Si performing at its best.
Unpacking the Standard 2017 Honda Civic Si Tire Size
Before we talk about upgrades, let’s establish the baseline. Knowing your car’s original equipment (OE) tire size is the first step in making any informed decision. For the 2017 Honda Civic Si, the factory tire size is very specific.
The standard 2017 Honda Civic Si tire size is 235/40R18. This is what Honda engineered your car to perform optimally with, balancing grip, ride comfort, and handling dynamics.
Decoding Tire Sidewall Information
Understanding what those numbers and letters mean is crucial for any DIY mechanic or car owner. Let’s break down 235/40R18:
- 235: This is the tire’s section width in millimeters. It measures from one sidewall to the other. So, your Si tires are 235mm wide.
- 40: This is the aspect ratio, or profile. It represents the tire’s height as a percentage of its width. In this case, the sidewall height is 40% of 235mm. A lower number means a shorter sidewall, often associated with sportier handling but a harsher ride.
- R: This indicates radial construction, which is standard for almost all modern passenger vehicle tires.
- 18: This is the diameter of the wheel in inches that the tire is designed to fit. So, your Si uses 18-inch wheels.
You might also see a service description like 95W. The 95 is the load index, indicating the maximum weight the tire can support. The W is the speed rating, which tells you the maximum speed the tire can safely sustain. For the Si, a W rating (up to 168 mph or 270 km/h) signifies its performance pedigree.
Understanding the OE Wheel Specifications
The tires work in harmony with the wheels. The stock 2017 Honda Civic Si wheels are typically 18×8 inches, with a +50mm offset and a 5×114.3 bolt pattern. When considering any change to your 2017 Honda Civic Si tire size, you also need to factor in wheel dimensions. Changing tire width significantly without changing wheel width can lead to improper fitment and compromised performance.
Why Your 2017 Honda Civic Si Tire Size Matters: Beyond the Basics
It’s easy to think “a tire is a tire,” but for a performance-oriented vehicle like the Si, the specific tire size and type are integral to its character. Understanding the benefits of 2017 Honda Civic Si tire size choices goes beyond just fitting them on the rim.
Impact on Handling and Performance
The 235/40R18 setup for your Si provides an excellent balance of grip and responsiveness. A wider tire (larger first number) generally means a larger contact patch with the road, leading to:
- Improved cornering stability.
- Better dry grip for acceleration and braking.
- A more aggressive stance.
However, going too wide can introduce issues like increased steering effort, tramlining (following grooves in the road), and potential rubbing. The aspect ratio (middle number) also significantly affects handling. A lower aspect ratio (shorter sidewall) means less flex, resulting in sharper steering response and better feedback, which is ideal for spirited driving.
Fuel Economy and Ride Comfort
While performance is a highlight, your tire choice also impacts daily driving. Tires with a higher rolling resistance can decrease your fuel efficiency. Generally, wider tires or those with aggressive tread patterns can increase rolling resistance.
The aspect ratio also plays a role in ride comfort. A lower profile tire, while great for handling, offers less cushioning against road imperfections. This can lead to a firmer, potentially harsher ride, especially on rougher roads. It’s a trade-off many Si owners are willing to make for the performance gains.
Safety First: Braking and Traction
Ultimately, your tires are a critical safety component. The right 2017 Honda Civic Si tire size ensures optimal braking distances and traction in various conditions. Tires are specifically designed to disperse water, grip asphalt, and maintain stability.
Mismatched tire sizes, incorrect inflation, or worn-out tread can severely compromise your car’s ability to stop quickly or maintain control, especially in emergency situations. Always prioritize safety when considering tire changes.
Choosing the Right Rubber: Upgrading Your 2017 Honda Civic Si Tire Size
So, you’re looking to enhance your Si’s performance or customize its look? Great! There are plenty of options, but it’s crucial to understand the implications of changing your 2017 Honda Civic Si tire size. This section serves as your 2017 Honda Civic Si tire size guide for upgrades.
Considerations for Aftermarket Wheels and Tires
When moving away from the stock setup, you need to consider several factors:
- Wheel Diameter: While 18-inch is standard, some Si owners opt for 17-inch for track use (more sidewall flex, lighter wheels) or 19-inch for aesthetics (larger wheel, lower profile tire).
- Wheel Width: If you go wider on the tire, you’ll likely need a wider wheel to properly support the tire’s sidewall. An 8.5-inch or 9-inch wide wheel is common for slightly wider tire setups.
- Offset: This determines how far the wheel sticks out from the hub. Incorrect offset can cause tires to rub against fenders or suspension components, especially during turns or over bumps. A common aftermarket offset for the Si is +35mm to +45mm, which can push the wheels out for a more flush look.
- Bolt Pattern: Stick with 5×114.3. This is non-negotiable for proper fitment.
Always do your research or consult a professional wheel and tire shop before making significant changes. You can use online tire size calculators to compare dimensions and potential fitment issues.
Popular Upgrade Options and Their Benefits
Many Si owners look for a bit more grip or a different aesthetic. Here are some common choices when considering an alternative 2017 Honda Civic Si tire size:
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Slightly Wider (e.g., 245/35R18 or 245/40R18): This is a common “plus-zero” or “plus-one” sizing.
- Benefits: Increased contact patch, potentially better dry grip and cornering. Can fill out the wheel wells more aggressively.
- Considerations: May require a slightly wider wheel (e.g., 8.5-inch). Ensure adequate clearance, especially if lowering the car. The 245/35R18 maintains a similar overall diameter, while 245/40R18 will be slightly taller.
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Downsizing to 17-inch Wheels (e.g., 235/45R17 or 245/40R17):
- Benefits: Lighter wheels can reduce unsprung weight, improving acceleration, braking, and handling feel. Taller sidewall offers more cushion for track bumps or rough roads, and can be more forgiving. Often cheaper tire options.
- Considerations: Less aesthetic appeal for some. Ensure brake caliper clearance.
Remember, any change in overall tire diameter will affect your speedometer reading. Keep the overall diameter as close to stock as possible (within 3%) to avoid issues with your car’s ABS and VSA systems.
Staying Safe with Plus-Sizing
When you opt for wider tires or larger wheels, a process often called “plus-sizing,” safety is paramount. Here are some 2017 Honda Civic Si tire size tips for safe upgrading:
- Check Clearance: Before committing, ensure the new tires won’t rub against fenders, suspension components, or inner wheel wells, especially at full lock or under compression.
- Maintain Overall Diameter: As mentioned, keep the overall tire diameter close to stock. This ensures your speedometer, odometer, and vehicle stability systems function correctly.
- Load Index and Speed Rating: Never choose tires with a lower load index or speed rating than your OEM tires. Your Si is a performance car, and its tires must match its capabilities.
- Professional Installation: If you’re unsure, have a reputable tire shop install and balance your new setup. Proper balancing is critical for ride comfort and tire longevity.
Installation and Maintenance: Your 2017 Honda Civic Si Tire Size Care Guide
Even the best tires won’t perform or last if they’re not properly cared for. Regular maintenance is key to maximizing the life and performance of your 2017 Honda Civic Si tire size setup. This is your practical guide on how to 2017 Honda Civic Si tire size care.
DIY Tire Rotation: A Step-by-Step Guide
Regular tire rotation (every 5,000-7,500 miles or with every oil change) helps ensure even wear across all four tires, extending their lifespan. For your Si, with its directional tires, follow the manufacturer’s recommended rotation pattern.
- Gather Your Tools: You’ll need a reliable floor jack, jack stands, a lug wrench (or impact wrench), and possibly a torque wrench.
- Safety First: Park your car on a flat, level surface. Engage the parking brake. Block the wheel opposite to where you’ll be lifting.
- Loosen Lug Nuts: Use your lug wrench to slightly loosen the lug nuts on the wheels you plan to remove while the car is still on the ground.
- Jack Up the Car: Place the floor jack under the manufacturer-specified jacking points and lift the car. Place jack stands securely under the designated support points. Never work under a car supported only by a jack.
- Remove Wheels: Fully remove the lug nuts and carefully take off the wheels.
- Rotate: Follow the correct rotation pattern for your Si. For non-directional tires, typically move front tires to the rear, and cross the rear tires to the front. For directional tires, move front to rear on the same side. Always check your owner’s manual for the specific pattern.
- Reinstall and Hand-Tighten: Place the wheels back on, hand-tighten the lug nuts.
- Lower the Car: Carefully lower the car off the jack stands.
- Torque Lug Nuts: Using a torque wrench, tighten the lug nuts to the manufacturer’s specified torque (usually around 80 ft-lbs for Honda). Tighten in a star pattern to ensure even pressure.
Proper Tire Pressure: The Foundation of Care
This is perhaps the simplest yet most overlooked aspect of tire care. Correct tire pressure is vital for safety, handling, fuel economy, and tire longevity.
- Check Regularly: Use a quality tire pressure gauge to check your tire pressure at least once a month, and always before a long trip. Check when tires are cold (before driving).
- Refer to the Sticker: Don’t rely on the pressure listed on the tire’s sidewall (that’s the max pressure). Look for the sticker on your driver’s side door jamb or in your owner’s manual for the recommended cold inflation pressure for your 2017 Honda Civic Si tire size.
- Impacts: Under-inflation leads to excessive heat buildup, increased wear on the outer edges, reduced fuel economy, and poor handling. Over-inflation leads to a harsher ride, increased wear in the center of the tread, and reduced grip.
When to Replace: Tread Depth and Age
Knowing when to replace your tires is a critical part of 2017 Honda Civic Si tire size best practices.
- Tread Depth: Most states legally require a minimum tread depth of 2/32nds of an inch. You can use a tread depth gauge or the “penny test.” Insert a penny into a tread groove with Lincoln’s head upside down. If you can see the top of his head, your tread is too shallow, and it’s time for new tires.
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Tire Age: Tires degrade over time, even if they have good tread. Rubber compounds harden, losing their grip and becoming more susceptible to cracking. Most manufacturers recommend replacing tires after 6 years, regardless of tread depth, and 10 years is generally considered the absolute maximum. Check the DOT code on your sidewall for the manufacturing date (e.g.,
XXYYwhere XX is the week and YY is the year). - Visible Damage: Inspect your tires regularly for cuts, bulges, cracks, or punctures. Any significant damage warrants immediate professional inspection.
Troubleshooting Common Problems with Your 2017 Honda Civic Si Tire Size
Even with diligent care, issues can arise. Knowing how to identify and address common problems with 2017 Honda Civic Si tire size issues can save you headaches and money.
Uneven Wear Patterns: What They Tell You
Uneven tire wear is a clear indicator that something isn’t right. It’s like your tires are trying to talk to you:
- Wear on Both Edges (Under-inflation): Your tires are likely under-inflated. The center of the tread doesn’t make full contact, leading to wear on the shoulders.
- Wear in the Center (Over-inflation): Your tires are likely over-inflated. The center bulges, causing it to wear faster than the edges.
- Wear on One Edge Only (Alignment Issues): This typically points to a wheel alignment problem (camber, toe, or caster). Get your alignment checked by a professional.
- Cupping or Scalloping (Suspension Issues): Uneven dips or hollows around the circumference of the tire often indicate worn or damaged suspension components (shocks, struts, bushings).
- Feathering (Alignment Issues): If the tread blocks are worn smooth on one side and sharp on the other, it’s usually a toe alignment issue.
Address uneven wear promptly. It’s not just about tire life; it impacts handling and safety.
Vibrations and Noise: Diagnosing Issues
Strange sensations or sounds often originate from your wheels and tires:
- Vibrations Through the Steering Wheel: This usually indicates an issue with the front tires, such as being out of balance, out of round, or having uneven wear.
- Vibrations Through the Seat or Floor: This often points to problems with the rear tires, such as being out of balance or having uneven wear.
- Road Noise Changes: If your tires suddenly become louder or produce a humming/growling sound, it could be due to uneven wear, cupping, or even worn wheel bearings.
If you experience persistent vibrations or unusual noise, have your wheels and tires inspected and balanced by a professional. They can also check for bent wheels or other underlying issues.
When to Call a Pro: Safety Critical Issues
While many tire issues can be diagnosed at home, some require expert attention. Always call a licensed professional if you encounter:
- Persistent Air Leaks: If you’re constantly reinflating a tire, it needs professional repair or replacement.
- Significant Punctures: While small punctures in the tread can sometimes be repaired, sidewall punctures are almost never repairable and require tire replacement.
- Bulges or Bubbles: These indicate internal tire damage and are extremely dangerous, signaling an imminent blowout. Replace the tire immediately.
- Steering or Braking Problems: If your car pulls significantly to one side, feels unstable, or your brakes feel spongy after a tire event, get it to a shop.
- Unexplained Vibrations or Noises: If balancing doesn’t solve the problem, there could be a deeper issue with your suspension or driveline.
Your safety is worth the cost of a professional diagnosis and repair.
Sustainable & Eco-Friendly 2017 Honda Civic Si Tire Size Choices
In today’s world, being mindful of our environmental impact extends even to our car choices. The good news is that you can make more eco-friendly 2017 Honda Civic Si tire size choices without sacrificing performance.
Understanding Low Rolling Resistance Tires
Low Rolling Resistance (LRR) tires are designed to minimize the energy lost as the tire rolls, primarily through material compounds and construction. This means:
- Better Fuel Economy: Less energy loss translates directly to less fuel consumed, reducing your carbon footprint and saving you money at the pump.
- Reduced Emissions: Burning less fuel means fewer harmful emissions released into the atmosphere.
- Performance: Modern LRR tires have come a long way and now offer a good balance of grip and efficiency. While dedicated performance tires might still offer an edge in ultimate grip, LRR options for the Si are improving.
When shopping, look for tires specifically marketed as “eco,” “green,” or “energy-efficient.” Many major manufacturers offer LRR options in sizes compatible with your 2017 Civic Si.
Recycling and Responsible Disposal
The lifecycle of a tire doesn’t end when it comes off your car. Proper disposal is a key part of making sustainable 2017 Honda Civic Si tire size decisions. Old tires can be a significant environmental hazard if not handled correctly.
- Tire Shops: Most tire retailers and service centers offer tire recycling programs, often for a small fee. They send old tires to facilities where they can be repurposed into playground surfaces, asphalt, or even fuel.
- Local Recycling Centers: Check with your local waste management or recycling facilities for specific tire disposal guidelines in your area.
- Avoid Landfills: Never dispose of tires in regular trash or by burning them. This creates toxic fumes and pollutes the environment.
By choosing LRR tires and ensuring responsible disposal, you’re contributing to a greener future for off-roaders and daily drivers alike.
Frequently Asked Questions About 2017 Honda Civic Si Tire Size
What is the stock tire pressure for a 2017 Honda Civic Si?
The recommended cold tire inflation pressure for your 2017 Honda Civic Si is typically found on a sticker inside your driver’s side door jamb. While it can vary slightly, it’s usually around 32-35 PSI for all four tires. Always check your specific vehicle’s sticker for the most accurate information.
Can I put bigger tires on my 2017 Honda Civic Si without rubbing?
You can often go slightly wider, for example, from 235 to 245 section width, without rubbing, especially if you maintain a similar overall tire diameter and have an appropriate wheel offset. However, going too wide or tall can cause rubbing with the fenders or suspension components, particularly when turning or over bumps. Always consult a tire size calculator and measure clearances carefully, or get professional advice.
How often should I rotate the tires on my 2017 Honda Civic Si?
It’s generally recommended to rotate your tires every 5,000 to 7,500 miles, or with every oil change. Regular rotation helps ensure even wear across all four tires, extending their lifespan and maintaining balanced handling. Refer to your owner’s manual for the specific rotation pattern for your Si’s tires.
What type of tires come standard on the 2017 Honda Civic Si?
The 2017 Honda Civic Si typically came equipped with high-performance all-season tires from the factory, designed to offer a balance of grip, longevity, and year-round usability. Some might have even come with summer performance tires depending on the region or specific package, but high-performance all-seasons were most common.
Does changing my tire size affect my speedometer?
Yes, if you change the overall diameter of your tire significantly (more than 3% difference from stock), it will affect your speedometer and odometer readings. A larger diameter tire will make your speedometer read slower than your actual speed, and a smaller diameter tire will make it read faster. This can also impact your car’s ABS and stability control systems, so try to keep the overall diameter as close to stock as possible when upgrading.
Choosing and maintaining the correct 2017 Honda Civic Si tire size is one of the most impactful decisions you can make for your vehicle. It directly influences your car’s performance, safety, and your driving enjoyment. Whether you stick with the factory spec, opt for a subtle upgrade, or prioritize eco-friendly options, the knowledge shared here empowers you to make smart choices.
Always prioritize safety, perform regular checks, and don’t hesitate to consult with a trusted tire professional when in doubt. Your Si deserves the best, and with the right tires and care, you’ll continue to enjoy every mile.
Stay safe and stay comfortable on the road, FatBoy!
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