The Difference Between Time Trial & Triathlon Bikes

Most modern tri and TT bikes look similar and can be used interchangeably, but there’s one key distinction: UCI rules. True TT bikes for sanctioned time trial racing may need to follow UCI design constraints. Triathlon bikes often prioritize real-world speed and convenience with hydration/storage integration. Unless you’re racing a national championship or UCI-governed event, you probably don’t need to obsess over UCI legality, fit and aerodynamics will matter more.

Triathlon Bike Sizing

Choosing the correct size matters, fit is the difference between “fast” and “fast for an Ironman race” Use the chart below as a starting point, then lean on our Ride Guides if you want help dialing stack/reach, cockpit setup, and your aero position.

Used Triathlon Bikes For Sale

The Pro’s Closet has a deep collection of used triathlon and tt bikes for sale, everything from beginner triathlon bikes to full-on Ironman winning bikes. The nice thing about special-purpose bikes is that they’re often treated well—many owners have multiple bikes and their tri bike doesn’t see as many messy miles or crashes as a daily road bike.

Best Triathlon Bikes 

The best triathlon bikes don’t take a single shape. Sometimes they’re relatively traditional, like Trek and Specialized triathlon bikes. Sometimes they’re radical, like Ventum bikes. Quintana Roo and Cervélo largely try to split the difference. Cervélo’s P-Series, including the P2 and P3 mix radical shaping with a double-diamond design. 

Time Trial Bikes 

There might be some confusion in names. Not all triathlon bikes are time trial bikes and not all time trial bikes are tri’ bikes. While they look really similar and are usually interchangeable, there are some design constraints put on international-level time trial bike races. 

If you are not racing a national championship or internationally-sanctioned Junior, U23, or Elite race, you probably don’t need to have your bike conform to the UCI design standards of a time trial bike, but you probably should remove the wind-cheating storage boxes and bags if your bike comes with them.

Every CPO bike is cleaned, tuned and tested at our Colorado headquarters.  Sell Your Gear today and we can make an offer for your bike, frame, or wheelset within two business days and help you avoid the frustration and renegotiation of the secondary market.

How much should I spend on a good Tri bike?

A good way to approach how much you should spend on a triathlon bike is basing it on your experience level, budget, and goals. Here's our breakdown:

1. Entry-level: $1,500 - $3,000 For beginners or those new to triathlons, you can find decent entry-level triathlon bikes in this range. These bikes will have aluminum frames and mid-range components.
2. Mid-range: $3,000 - $6,000 More serious athletes or those looking to upgrade will find good options in this price range. These bikes feature carbon frames and higher-quality components.
3. High-end: $6,000 - $12,000+ For competitive athletes or riders seeking top-of-the-line performance, high-end triathlon bikes can cost upwards of $12,000 or more.

Considerations:

• Your budget. Don't overspend if you're just starting out. You can always upgrade later.
• Frequency of use. If you plan to compete regularly, investing in a better bike might be worthwhile.
• Your goals. Casual participants won’t need to spend as much as those aiming for competitive times.
• Alternatives. Consider buying a used triathlon bike to get more value for your money.
• Upgrades. Remember that you can upgrade components over time, so you don't need to buy the most expensive bike right away.

For beginners, we recommend starting with a road bike (which can be less expensive) and add clip-on aero bars. This gives you versatility and allows you to determine if you want to commit to the sport before investing in a dedicated triathlon bike.

What makes for a good TT bike?

‘Good’ triathlon bikes are designed to optimize aerodynamics, comfort, and efficiency for long-distance racing. A few features that make for a good tri bike include:

1. Aerodynamic frame: The frame should have a streamlined shape to reduce wind resistance. This often includes aero tubing, integrated components, and hidden cables.
2. Aggressive geometry: Tri bikes have a steeper seat tube angle (typically 76-78 degrees) compared to road bikes. This positions the rider further forward, opening up the hip angle for better power output and a more aerodynamic posture.
3. Aero bars: These allow the rider to maintain an aerodynamic position by resting their forearms on pads and gripping the extensions.
4. Comfortable ride: Despite the aggressive position, a good tri bike should be comfortable enough for long-distance riding. This includes a well-designed saddle and appropriate frame stiffness.
5. Efficient power transfer: The frame should be stiff enough to transfer power effectively from the rider to the wheels.
6. Integrated storage: Many tri bikes feature built-in storage solutions for nutrition, hydration, and tools, maintaining aerodynamics while providing easy access.
7. Quality components: Reliable shifting and braking systems are crucial. Electronic shifting is becoming increasingly popular for its precision and ease of use.
8. Aerodynamic wheels: Deep-section wheels or disc wheels can significantly reduce drag.
9. Adjustability: A good tri bike should offer a range of adjustments to fine-tune your position for optimal comfort and performance.
10. Weight: While not as critical as in climbing road bikes, a lighter bike can still offer advantages, especially on hilly courses.
11. Good handling: While tri bikes prioritize straight-line speed, they should still handle well enough for cornering and descending.

How to Choose a Triathlon Bike: Buying Dos and Don'ts - From TPC's Magazine

Triathlon bikes (also called tri bikes) are made specifically for triathlon racing where the bike leg can be anywhere from 12 miles to 112 miles. Tri bikes often have a steeper seat tube angle, pushing the hips forward on the ride and saving the hamstrings for the run. With the seat tube closer to vertical, the rider's hips are over the crankset, which engages the quadriceps for power. Read the full article here.

11 Best Triathlon Bike Accessories - From TPC's Magazine

There’s no way around it, triathlon requires a lot of stuff. If you’re new to triathlon, you don’t necessarily need to shell out for everything right away, but there are some things you can’t do without. Like a helmet. I picked 13 of my favorite bike things for triathlon — some of them totally necessary, and others that just make us feel like pros. Read the full article here.

View our related product listings pages: TT bikes on sale

Visit us at our Thornton, Colorado Bike Store to see our full triathlon / TT bike collection in person.