The 2025 Sidi Size Guide 

In 2025, Sidi celebrates its 65th anniversary. There are few brands in the cycling industry that have so much history behind them, while still directly influencing the shape of today’s sport.

Sidi is renowned for making beautiful, hand-crafted shoes using traditional, artisan techniques. The majority of its shoes are still made in Italy, using the same techniques favoured by some of the most luxurious fashion cobblers in the world.

Such craftsmanship is a skill, passed down from generation to generation, which is what makes Sidi unique amongst its competitors. However, racing is what drives Sidi and creating the highest performance shoes for its athletes is paramount, with pro feedback on the fit, stiffness and technology all playing a key part in the brand’s development.

Is it true that Sidi shoes are small?
Introducing Millennium Fit
What size of Sidi shoe do I need?
What about Sidi shoes for extra wide feet?
Do Sidi Road and MTB shoes fit the same?
What about women’s sizing?
Any further Sidi sizing advice?

Is it true that Sidi shoes are small?

When the company was founded 65 years ago, it was a ‘badge of honour’ to have narrow shoes, as it apparently indicated the low body fat build associated with pro riders.
Over the years, our understanding of physiology and ergonomics has meant that this perception has become outdated. Over the past 20 years, Sidi’s shoes have gradually become larger, with every new model receiving a larger last. If you were to compare last year’s Shot 2 to the Wire from 10 years ago, for instance, you would notice a significant difference.

So, were Sidis small? The answer is of course subjective, as some riders need and prefer a narrower shoe. However, with casual trainers becoming larger and orthopaedic insoles becoming normalised during bike fits, the need for larger shoes has become apparent.

Introducing Millennium Fit

In 2025, Sidi made the biggest update to its range in its long and prestigious history.

Fresh manufacturing techniques and cutting-edge technology have been integrated into the latest models, giving a new aesthetic and level of performance to the brand.Within this update, a new last has been employed across the new models, featuring Millennium Fit. This fit creates a higher volume around the toe box, both in width and height, to allow more ‘spread’ of your toes. It also means wider custom insoles will fit more easily, as there is more space.

The Millennium Fit, however, doesn’t affect the back of the shoes, so foot retention remains high from the middle towards the back.

All of the new 2025 and 2026 shoes feature this updated fit.

What size of Sidi shoe do I need?

Using your current casual or cycling shoes is always a good benchmark to start working out what size of shoe you require.

For example, I am a size 44 in all my casual shoes and have been running a 44 in all my Sidis for the past five years. I now wear the Ergo 6 and Asper Laces models, which feature the Millennium Fit, and still use a size 44.

So, what has changed? The length of the shoes remains the same, but I now have more space for my toes, creating less pressure and reducing ‘hot spots’ on the outside during warmer rides. My custom insoles also fit better, thanks to the higher volume of the shoes.

An often-overlooked sizing tip with Sidi is that the sole length of a whole size and a half size (44 and 44.5) is the same, however, the upper on the half size has more fabric, to allow a larger volume for width and height.

This means that, if you find the length of a 44 works well for you, but you need more volume to fit wider feet or more height for a higher instep or orthopaedic insole, then going for the 44.5 is your best bet. Moving up to a 45 will make the shoe both longer and slightly wider, which could then introduce heel lift.

FAQS