Bianchi publishes a single size guide as a PDF, linked from each bike’s page, that assigns a size to every centimeter of height from 150 to 197 cm and also gives the reference inseam and saddle height. This chart summarizes that guide (July 2026 version, checked in October 2026) by grouping the heights for each size. The guide doesn’t cover Bianchi’s mountain bikes. Bianchi works in centimeters, so we converted heights to the nearest inch and inseams to a tenth of an inch. Because Bianchi’s sizes don’t overlap but its steps are small, two neighboring sizes can show the same inch: the centimeters decide.
Bianchi road bike sizes by height
The size is a number close to the seat tube length in centimeters. The Specialissima and Oltre share a chart; the Infinito, Sprint and Oltre Race share another that only differs in the large sizes.
| Size | Specialissima, Oltre | Infinito, Sprint, Oltre Race | Inseam |
|---|---|---|---|
| 47 | 4 ft 11 in–5 ft 4 in (150-162 cm) | 4 ft 11 in–5 ft 4 in (150-162 cm) | 27.4-29.3 in (69.5-74.5 cm) |
| 50 | 5 ft 4 in–5 ft 6 in (163-168 cm) | 5 ft 4 in–5 ft 6 in (163-168 cm) | 29.5-30.5 in (75-77.5 cm) |
| 53 | 5 ft 7 in–5 ft 9 in (169-174 cm) | 5 ft 7 in–5 ft 9 in (169-174 cm) | 30.7-32.3 in (78-82 cm) |
| 55 | 5 ft 9 in–5 ft 10 in (175-178 cm) | 5 ft 9 in–5 ft 10 in (175-178 cm) | 32.7-33.3 in (83-84.5 cm) |
| 57 | 5 ft 10 in–6 ft (179-183 cm) | 5 ft 10 in–6 ft (179-183 cm) | 33.5-34.1 in (85-86.5 cm) |
| 59 | 6 ft–6 ft 5 in (184-195 cm) | 6 ft–6 ft 3 in (184-190 cm) | 34.3-36.8 in (87-93.5 cm) |
| 61 | — | 6 ft 3 in–6 ft 6 in (191-197 cm) | 36.0-37.4 in (91.5-95 cm) |
A dash means the guide doesn’t assign that size to the model. In the inseam column, the 59 covers the long range of the Specialissima and Oltre; on the Infinito the 59 runs from 34.3 to 35.8 in (87-91 cm).
Bianchi gravel bike sizes by height
The Impulso, Arcadex and Arcadex ALU use letters and wider ranges.
| Size | Impulso, Arcadex, Arcadex ALU | Inseam |
|---|---|---|
| XS | 4 ft 11 in–5 ft 3 in (150-161 cm) | 27.4-29.1 in (69.5-74 cm) |
| SM | 5 ft 4 in–5 ft 7 in (162-171 cm) | 29.3-31.1 in (74.5-79 cm) |
| MD | 5 ft 8 in–5 ft 11 in (172-180 cm) | 31.5-33.7 in (80-85.5 cm) |
| LG | 5 ft 11 in–6 ft 2 in (181-189 cm) | 33.9-35.6 in (86-90.5 cm) |
| XL | 6 ft 3 in–6 ft 6 in (190-197 cm) | 35.8-37.4 in (91-95 cm) |
If you’re between two sizes
Bianchi’s guide has no overlaps: each height gets exactly one size. But the steps between sizes are small (about 1.5 inches, or 3-4 cm, of height between the 55 and the 57), so if you’re on the edge, look beyond height:
- Inseam: it’s the figure the guide itself puts alongside. If yours is long for your height, the size that matches your inseam usually gets the saddle height closer.
- Reach (the horizontal distance from the bottom bracket to the head tube): with a long torso and arms, the larger size; if you prefer a more upright position or you’re not very flexible, the smaller one.
- Bianchi itself notes that the guide is a starting point and that the right size should be set by a fitter who sees you on the bike.
To check, measure your inseam as described in how to find your bike size, get a starting size from the bike size calculator, and put the two candidate sizes, or your current bike, into the bike geometry comparison. The size chart by brand has Bianchi next to the other brands.
Frequently asked questions
What size Bianchi do I need if I'm 5'9"?
A 55 on the Specialissima, Oltre, Infinito or Sprint, which Bianchi lists for 175-178 cm (5 ft 9 in to 5 ft 10 in). On the Impulso or Arcadex, an MD (172-180 cm).
Do the Specialissima and the Infinito have the same sizes?
Up to the 57, yes: the 47, 50, 53, 55 and 57 cover the same heights. From 184 cm (6 ft) they differ: the Specialissima and Oltre use the 59 up to 195 cm (6 ft 5 in), while the Infinito, Sprint and Oltre Race move to the 61 from 191 cm (6 ft 3 in).
What inseam goes with each Bianchi size?
According to its guide, a 53 goes with a 30.7-32.3 in (78-82 cm) inseam and a 55 with 32.7-33.3 in (83-84.5 cm). If your height and inseam fall into different sizes, go by inseam.