Claire WhitakerBy Claire Whitaker

Updated November 2026

A specialized allez road bike size chart gives you a starting point, but the number on the chart only tells part of the story. This guide shows you how to use the chart with your height, inseam and riding position so you can pick a frame size that fits and feels comfortable from your first ride. You will also learn how to check fit once the bike arrives.

How to Read the Allez Size Chart

Specialized sizes its Allez road bikes by frame size, usually listed in centimeters for the seat tube and sometimes as a size name such as XS, S, M, L and XL. Manufacturers publish their own charts, and these charts are built around height ranges, so start by finding your height in the range column. If you fall close to the boundary between two sizes, do not guess. Use the reach and stack numbers in the geometry table, which describe how far forward and how tall your riding position will be.

Shopping for one? See our guide: 5 Best Road Bike Shoe Size Charts (2026): Expert Picks.

Measure Yourself Before You Choose a Size

Height alone does not capture how a road bike fits your body. Taking two simple measurements helps you compare yourself against the geometry data.

  1. Stand against a wall in socks, heels about 5 cm apart, and measure your height in centimeters.
  2. Measure your inseam: stand with your back to a wall, place a book between your legs at crotch height, and measure from the top of the book to the floor.
  3. Note your arm length from shoulder to wrist if you have a tape measure, since reach strongly affects how stretched you feel on the bars.
  4. Compare these numbers with the reach and stack values listed for each Allez size.

Check Fit on the Bike

Once you have a candidate size, the chart is only confirmed by how the bike feels. Many riders find it useful to start with the saddle at a height where your leg has a slight bend at the bottom of the pedal stroke, then assess the rest of the fit. Ask yourself these questions during a short test ride or in a shop:

  • Can you stand over the top tube with about 2 to 3 cm of clearance?
  • Does your back feel relaxed rather than strained when your hands rest on the hoods?
  • Are your knees tracking over the pedals without pulling inward or outward?
  • Can you comfortably reach the brake levers without your shoulders hunching?

Common Mistakes to Avoid

  • Choosing a larger frame because you plan to grow into it. A bike that is too big is harder to control and less comfortable.
  • Ignoring reach. Two bikes with the same seat tube size can feel very different if their top tubes differ.
  • Relying only on height. Riders with long legs or short torsos often need a different size than the height chart suggests.
  • Skipping a test ride. Even a few minutes on the bike reveals fit problems a chart cannot.
  • Assuming the saddle and stem can fix everything. They help with fine tuning, but they cannot fully correct a frame that is too large or too small.

A basic tape measure makes the inseam and arm length checks quick and accurate, and a simple bike fit tool can help you check saddle height and reach at home.

  • A flexible tape measure for taking height, inseam and arm measurements. View on Amazon
  • A digital angle finder to check knee and hip angles during a self-fit session. View on Amazon

FAQ

Can I use the specialized allez road bike size chart if I am between two sizes?

Yes, but compare the reach and stack numbers rather than relying on height alone. Choose the size whose geometry matches your measurements and how you prefer to ride.

Does the Allez size chart work for women?

Specialized also publishes women-specific road bike charts, and women often have different proportions. Check both charts and compare geometry before deciding.

Should I talk to a professional bike fitter?

If you have pain, numbness or recurring discomfort after riding, consult a professional bike fitter or a medical provider. A fitter can make adjustments a chart cannot.

Conclusion

The specialized allez road bike size chart is a useful starting point when you combine it with your height, inseam and reach measurements. Confirm your choice with a test ride and a quick check of the fit points above. A well-matched frame makes every ride more comfortable and easier to enjoy.

Ready to choose one?

Claire Whitaker

About Claire Whitaker

Claire Whitaker is part of our editorial team and reviews and edits our cycling for beginners guides, checking product details against manufacturer specifications and owner feedback.