Finding your size on a BH road bike
BH builds its performance road bikes around one shared idea: a racing position that stays composed on long days. That family spans the featherweight Ultralight EVO climber, the aero Aerolight, the all-round G8, and the accessible Ultralight RC. The single most useful thing to know is that all four share the same size names and the same rider-height brackets, so once you land on a BH size it carries across the range. BH also runs a slightly taller stack and shorter reach than many rivals, which means the fit feels racy without folding you in half. Browse the full lineup in our BH collection.
Please note. The sizes below are a starting point, not a guarantee. Your ideal fit depends on proportions, flexibility, riding style and saddle position. Treat this guide as indicative and confirm against a proper bike fit or a chat with our team before you buy.
Quick size finder
Match your height and inseam to the row that fits, then read across to see the size for each model. BH uses the same height brackets for the Ultralight EVO, Aerolight, G8 and Ultralight RC. The Aerolight adds an extra XXL at the top of the range.
| Rider height | Leg length (inseam) | Ultralight EVO | Aerolight | G8 | Ultralight RC |
|---|---|---|---|---|---|
| 150 to 162 cm (4'11" to 5'4") | 65 to 70 cm | XS | XS | XS | XS |
| 163 to 172 cm (5'4" to 5'8") | 70 to 75 cm | SM | SM | SM | SM |
| 173 to 181 cm (5'8" to 5'11") | 76 to 80 cm | MD | MD | MD | MD |
| 180 to 186 cm (5'11" to 6'1") | 80 to 85 cm | LA | LA | LA | LA |
| 186 to 200 cm (6'1" to 6'7") | 85 to 90 cm | XL | XL | XL | XL |
| 190 cm and up (6'3" and up) | 90 cm and up | — | XXL | — | — |
Some brackets overlap. If you fall between two rows, the sections below will help you decide.
How to measure yourself
Height. Stand barefoot with your back and heels against a wall, look straight ahead, and mark the top of your head. Measure from the floor to the mark. Do it twice for a reliable figure.
Leg length (inseam). Stand barefoot with your feet about 15 cm apart and place a book spine-up between your legs, pulled firmly against your body as a saddle would sit. Measure from the floor to the top edge of the book. That number is your inseam, and it is the most honest guide to frame size because two riders of the same height can have very different leg lengths.
Ultralight EVO
The Ultralight EVO is BH's lightweight climber, reshaped in recent years with aero touches borrowed from the Aerolight. It is lively, quick to accelerate and happiest pointing uphill.
| Size | Stack (mm) | Reach (mm) | Rider height |
|---|---|---|---|
| XS | 517 | 382 | 150 to 162 cm |
| SM | 523 | 383 | 163 to 172 cm |
| MD | 549 | 384 | 173 to 181 cm |
| LA | 583 | 386 | 180 to 186 cm |
| XL | 594 | 396 | 186 to 200 cm |
Fit character: a featherweight racer that rewards a punchy, forward position on the climbs.
Aerolight
The Aerolight is the fastest bike in the range, a Kamm-tail aero platform that BH has evolved into a lightweight all-rounder. It offers the widest spread of sizes, including an XXL, and the most stretched-out reach at the top end for riders who want a low, long, aggressive cockpit.
| Size | Stack (mm) | Reach (mm) | Rider height |
|---|---|---|---|
| XS | 510 | 368 | 150 to 162 cm |
| SM | 523 | 375 | 163 to 172 cm |
| MD | 539 | 382 | 173 to 181 cm |
| LA | 554 | 390 | 180 to 186 cm |
| XL | 576 | 399 | 186 to 200 cm |
| XXL | 602 | 408 | 190 cm and up |
Fit character: the sharpest, longest reaching cockpit in the range, built for speed.
G8
The G8 is BH's all-round aero road bike, the do-everything option that blends fast tube shapes with an approachable, stable ride. Its geometry sits close to the Ultralight EVO, so the sizing carries straight across.
| Size | Stack (mm) | Reach (mm) | Rider height |
|---|---|---|---|
| XS | 514 | 374 | 150 to 162 cm |
| SM | 523 | 383 | 163 to 172 cm |
| MD | 549 | 384 | 173 to 181 cm |
| LA | 583 | 386 | 180 to 186 cm |
| XL | 594 | 396 | 186 to 200 cm |
Fit character: a versatile race position that stays comfortable when the ride runs long.
Ultralight RC
The Ultralight RC shares the Ultralight frame silhouette and climbing DNA at a friendlier price. It is the value entry into BH's lightweight road world, and it follows the same size brackets as the Ultralight EVO.
| Size | Stack (mm) | Reach (mm) | Rider height |
|---|---|---|---|
| XS | 517 | 382 | 150 to 162 cm |
| SM | 523 | 383 | 163 to 172 cm |
| MD | 549 | 384 | 173 to 181 cm |
| LA | 583 | 386 | 180 to 186 cm |
| XL | 594 | 396 | 186 to 200 cm |
Fit character: the same eager climbing position as the EVO, at an accessible price. Figures shown mirror the Ultralight frame and should be confirmed against the exact model.
What BH riders find
Owners consistently describe BH road frames as running a touch taller in stack and shorter in reach than comparable bikes from the big American brands. In practice that means the fit feels racy but not brutal, and riders coming from a Specialized or Trek often end up on the same size or one size smaller. The reach steps between sizes are modest, so a stem swap of 10 mm either way usually dials in the cockpit nicely. The recurring praise is for stiffness-to-weight on the climbs and a planted feel when the road tilts down.
Between two sizes?
If you land between two sizes, think about how you ride. Choose the smaller size for a lower, sportier front end and sharper handling, which suits racing and fast group rides. Choose the larger size for a more upright, comfortable position on long days. Your inseam is the tie-breaker: a longer inseam for your height nudges you up, a shorter one nudges you down. When it is truly a coin toss, our team can compare the exact stack and reach against your current bike.
Shop BH road bikes
Ready to browse? Explore every model and build in our BH collection, from the featherweight Ultralight EVO to the aero Aerolight and G8.
Still not sure which size or model is right for you? Talk to our concierge. Tell us your height, inseam and the bike you ride now, and we will point you to the right BH.
Geometry figures are official manufacturer data where available and are drawn from recent BH model years, so a current frame may vary slightly. The Ultralight RC figures are estimated from the shared Ultralight frame and are flagged as such. Sizes and height ranges are indicative. Always confirm against the exact bike and, ideally, a professional fit before purchase.
