Rotary Engine T-Shirt

Your Tee, Your Way - Regular vs Relaxed Fit

Our men's tees come in your choice of a standard regular fit or a premium relaxed fit. So, what's the difference?

Standard Regular Fit Tees
Our Standard Regular Fit Tees are all about easy, everyday comfort. Crafted from 100% soft combed cotton (with the exception of our marle colours, which have a 15% viscose blend for that subtle textured look), these tees hit the sweet spot between weight and wearability. The mid-weight fabric, at 180gsm, is light enough to keep you cool in summer but still durable enough for year-round use. They’re preshrunk to reduce any surprises after the first wash, and thanks to their real-world sizing, you can expect a consistent, reliable fit that won’t leave you guessing. Plus, they're machine washable, making them super easy to care for. These tees are perfect if you want something that feels soft, fits well, and works across any season.
Premium Relaxed Fit Tees
If you’re after something with a little more substance, check out our Premium Relaxed Fit Tees. These are made from 100% heavyweight cotton, offering a thicker, more durable option with fabric weights ranging from 240gsm to 280gsm. Designed for a looser, boxy fit, these tees have that laid-back, oversized vibe, making them great for layering or wearing on cooler days when you want to stay comfortable and warm without compromising on style. Like the Standard tees, they’re preshrunk to minimize shrinking and ensure your fit stays spot on wash after wash. Machine washable for easy care, these tees are perfect for those who love a bit more room to move and a shirt that feels like it’ll last forever. Ideal for cooler weather or for those who prefer a more relaxed, heavyweight feel.

Regular vs Relaxed Fit

Our men's tees come in your choice of a standard regular fit or a premium relaxed fit. So, what's the difference?

Standard Regular Fit Tees
Regular fit, not too loose, not too tight.
100% soft combed cotton.
Mid-weight 180gsm fabric.
Premium Relaxed Fit Tees
Boxy, oversized fit.
100% premium carded cotton.
Heavy-weight 280gsm fabric.

How to Choose the Perfect Size

Choosing the right size is easy! To make sure your new gear fits just the way you like, start by measuring a t-shirt you already own and love. Lay it flat on a smooth surface and measure straight across the front from armpit to armpit. Once you’ve got that measurement, simply compare it to the sizes listed in our guide to find the best match.

If you're in between sizes or prefer a more relaxed fit, we recommend ordering a size up for added comfort. This ensures you’ll get a great fit, whether you’re going for a classic look or something a little oversized.

Size Charts

Measuring a t-shirt you already have from armpit to armpit. Once you’ve got that measurement, simply compare it to the sizes listed in our guide to find the best match.

Order Processing, Shipping and Returns Information

Order Processing and Shipping Times

At Petrol Threads, every item is hand-printed to order, ensuring the highest quality for our customers. This process typically takes 3-5 business days before your order is ready to be shipped. If you’re in a rush and need your gear faster, simply let us know, and we’ll do our best to meet your timeline.

We’ve been in the business for 17 years, and during that time, we’ve worked with a variety of delivery companies to ensure you get the best possible service. After plenty of trial and error, we found that Australia Post stands out as the most reliable choice. We use both regular and express post options, and every order is sent with a tracking number, so you can follow your parcel’s journey from our studio in Pitt Town NSW, straight to your door. Once your order is dispatched, we’ll email you the tracking details so you can stay updated.

For customers in Australia, shipping is always free—no surprises at checkout. For our New Zealand friends, shipping costs are calculated based on your order’s weight and will be clearly displayed during checkout.

Please note that we are an online-only business and don’t offer local pickups. And at the moment, we ship to Australia and New Zealand only.

Returns and Exchanges

At Petrol Threads, we are a truly bespoke brand. We don't keep a stock of products; instead, we print your clothing when you order. Therefore, please choose your design and size carefully. We provide all the measurements and are happy to answer any questions before you place your order. If the size you order isn't right for you, don't worry. You can return your clothing within 30 days for a refund. Just make sure your items are unworn, unwashed, and still have the tags attached. If you need a different size, simply submit a return request. Once approved, you can place a new order. We find this to be the fastest and easiest way to ensure you get the right fit.

Click here to start a return request. (Please be aware that international customers are responsible for their own return shipping costs.)

Why Buy a Car T-Shirt from Petrol Threads?

At Petrol Threads, our car t-shirts aren't just clothes—they’re a statement. Whether you’re passionate about JDM legends, classic Aussie muscle, or the sleekest supercars on the market, our tees are designed for car enthusiasts who appreciate style, quality, and authenticity. Each t-shirt brings the spirit of the automotive world straight to your wardrobe with exclusive designs that reflect your love for cars.

.

Quality You Can Feel
Our t-shirts are crafted from premium AS Colour apparel, ensuring comfort, durability, and that perfect fit. Whether you prefer a regular fit for a classic look or an oversized style for a more relaxed vibe, our tees are made from soft, mid-weight cotton that holds up wash after wash.

.

Unique Designs, Hand-Printed in Australia
Every Petrol Threads design is created in-house by our team, who have over 30 years of experience in the automotive industry. Our t-shirts are hand-printed to order in our Hawkesbury studio, giving each one a personal touch. Inspired by Australia’s car culture, these designs are exclusive to Petrol Threads, so you won’t find them anywhere else. Each tee is more than just apparel—it’s a piece of wearable art that speaks to your automotive passion.

.

Support Local Small Business
We’re a proud, family-owned business based in Australia. Since 2007, we’ve been part of the local car community, bringing quality, originality, and ethical practices to everything we do. We use only AS Colour apparel, ensuring our supply chain is responsible and sustainable. When you buy from Petrol Threads, you’re not just getting a t-shirt—you’re supporting a small, local business with a big passion for cars.

.

Choose Petrol Threads for a t-shirt that’s as unique and high-performance as the cars you love.