women's cycling modify road bike for triathlon

5 Mods To Do A Triathlon On Your Road Bike

bike tech Feb 18, 2021

Looking to get into triathlon and unsure whether to do it on your road bike or to fork out money for a TT bike? Don’t worry, you’re not the first.

Although there are several upgrades that can be made to any bike to make you faster and more efficient such as new wheels and fit-for-purpose gearing ratios, this article will focus specifically on modifications you can make to emulate an ultra-chic TT bike.

Ideally, we’d all be millionaires who live in mansions with huge sheds full of dozens of bicycles – each with a specific purpose and which fit us like a glove. If this isn’t you, there are products available to emulate some of the benefits that a TT bike provides.

A TT bike is designed specifically to increase efficiency, power and aerodynamics and has several key structural differences to a road bicycle which achieve this.

Here are our best mods for turning your road bike into a TT machine.

NB: some modifications may affect the warranty on the product and/or your bicycle. Please consult your local bike shop for correct fit and installation.

Clip On Aero Bars

The key difference between a TT bike and a road bike is in the ANGLES of the frame and components. To emulate the benefits those angles provide, a pair of clip on aero bars is an inexpensive modification to achieve a lower, more aerodynamic position. 

As with everything, there will be a balance between quality and price. A factor will be how long you will spend in a time trial position.

Although there is nothing stopping you from getting carbon clip ons for a sprint distance triathlon, if you are doing an event such as an Ironman, you may want to consider testing a few out first to make sure they’re comfortable.


On a TT bike, the rider is in a much different position than on a road bike. They are leaning forward onto their aero bars with their elbows close together to encourage aerodynamics to do their thing.

Mounting aero bars on top of your handlebars creates a slight increase in height. To compensate for this, there are several modifications you can make to the stem on your road bike to achieve a more comfortable and aerodynamic position.

The first option is to ensure spacers (circular discs which sit on the steerer) are sitting above the handlebars, putting them in the lowest position possible.

The second option is to buy a drop track stem which angles downwards toward the ground. These can be purchased at varying angles, so it may pay to try before you buy or get a professional fitting.

Seat Post

The ability to run off the bike is an important consideration in buying a TT bike, as their specific geometry ‘opens up’ the hip angle. On your road bike, the geometry of the frame and the angle of the seat tube will mean you are sitting too far back to comfortably reach the aero bars.

Your solution? An offset seat post.

A seat post with offset (where the clamp which attaches to the saddle isn’t positioned directly on top of the seat tube) normally allows the rider to sit further back - thereby increasing the distance between the saddle and the handlebars. To get further forward and open up that hip angle, you can either buy a forward-facing offset seatpost (fit for purpose but expensive) OR a regular offset seat post and then turn it around thereby reducing the reach to the handlebars.

TOP TIP – make sure the seat post you buy is compatible with your saddle.

Bar end shift levers

Bar end shift levers are exactly that, shifting levers which are located at the ends of your bars. Why?

A TT bike is set up so that the rider can stay on the aero bars for as long as possible, thereby maximising the benefits that go with it. When adding clip ons to your road bike, if you need to shift gears you will still need to get off the aero bars and shift using your brifters (brake-shifters).

Consider having your LBS install bar end shift levers so that you can stay on your aero bars for as long as possible during your event.


Triathletes sit on the nose of the seat when in the aero position, and trust us when we tell you that you will require a different saddle to relieve the pressure on soft tissue created by your newly acquired aero position.

If you sit too far back or on the wrong part of the saddle it can cause severe pain and discomfort and may also interfere with the open hip angle you have worked so hard to achieve with the first 4 modifications.

Long Story Short

There are always minor modifications you can do to your bike to make it more fit for purpose, but you may find that once you consider splurging on these different bits of kit, it may be better to purchase a TT bike - either new or second hand. If you decide to go down that route, make sure the bike fits you!

And, as always, enjoy!