What size Cervélo bike should I get for 5'10" (178 cm)?

At 5'10" (178 cm), the published Cervélo road chart puts you in the overlap between a 54 (170-179 cm) and a 56 (177-185 cm). Riders with an 82-84 cm inseam often start by comparing both, then let stack, reach, and riding style break the tie. The Caledonia-5 can keep you comfortable on the same number, while race-focused R5 and S5 buyers often end up preferring the smaller frame if they already know they like a lower front end.

What size Cervélo R5 for 5'8" (173 cm)?

A 5'8" (173 cm) rider with a 78-80 cm inseam fits a 54 Cervélo R5 (height range 170-179 cm, stack 532 mm, reach 388 mm). The 51 (164-172 cm) is the alternative if you have a shorter torso or want maximum saddle-to-bar drop for racing. Cervélo's published guidance is to choose the smaller size when between options because the R5's aggressive race geometry is designed to be ridden with the saddle pushed back and stem slammed; the 54 hits this brief for most 5'8" riders.

Is Cervélo sizing the same as Specialized or BMC?

Close, but not identical. A 54 Cervélo R5 (stack 532 mm, reach 388 mm) is roughly equivalent to a 54 Specialized Tarmac SL8 (stack 538 mm, reach 386 mm) - 6 mm less stack on the Cervélo gives it a fractionally more aggressive front end. A 54 BMC Teammachine R (stack 524 mm, reach 391 mm) sits lower and longer still. If you're moving from Specialized to Cervélo at the same numeric size, expect to add a 5 mm spacer to keep your bar height; moving from BMC, you may need to remove one.

Are Cervélo bikes true to size for endurance riders?

Cervélo's published ranges are a good starting point for endurance riders, especially on the Caledonia-5, but the frame number alone does not finish the job. The Caledonia-5 sits taller than the R5 and S5 at the same nominal size, and the S5 gives you less room to rescue a bad call after purchase. If you are between two sizes, compare stack, reach, and cockpit adjustment on the exact model before you order.

How is the Cervélo P5 triathlon bike sized differently from the R5?

The P5 uses tri-specific geometry and is sized by your functional aero position, not by height. At a 54-equivalent size the P5 has a stack of 495 mm and a reach of 410 mm - far longer and lower than the R5's 532/388 - because the steep seat tube angle rotates the rider forward over the bottom bracket. Pad stack, pad reach, and saddle setback drive the size choice, so a professional aero fit matters before ordering. Riders cannot reliably translate their road Cervélo size to a P5 without one.

Cervélo Bike Size Chart: Road, Gravel, and Tri by Height

Published height and inseam ranges for R5, S5, Caledonia-5, Áspero-5, and P5

CanadaFounded 1995Official Website

Where this answer applies, what it is based on, and what to check next

Where it applies

Current Cervélo road charts
Applies to the R5, S5, and Caledonia-5 guidance on this page, where the same frame number can still feel racy on one bike and relaxed on another.
Current gravel and tri checks
Áspero-5 follows the published gravel chart, while P5 sizing still needs pad-stack and pad-reach numbers before height alone can settle the choice.

Sources behind this answer

Cervélo R5 geometry page
Road Bike · R5 · 2025
Measurement basis: Published rider height and inseam rows, then stack and reach from Cervélo's current R5 geometry table.
Reviewed: 2026-09-10
Still uncertain: The R5 uses the same number run as the rest of Cervélo's road line, but its lower front end can still push a between-sizes rider toward the larger option.
Cervélo S5 geometry page
Road Bike · S5 · 2025
Measurement basis: Published rider height and inseam rows plus the current S5 stack and reach table.
Reviewed: 2026-09-10
Still uncertain: The integrated front end leaves less room to rescue a bad size call after purchase, so a road-bike number alone is not enough on the S5.
Cervélo Caledonia-5 geometry page
Road Bike · Caledonia-5 · 2025
Measurement basis: Published rider height and inseam rows plus the current Caledonia-5 geometry table.
Reviewed: 2026-09-10
Still uncertain: A Caledonia-5 with the same size number sits taller than an R5 or S5, so comfort-seeking riders may stay on the same number rather than size up.
Cervélo Áspero-5 geometry page
Gravel Bike · Áspero-5 · 2025
Measurement basis: Published gravel size rows plus Cervélo's geometry table for the current Áspero-5 frame.
Reviewed: 2026-09-10
Still uncertain: Áspero-5 is close to the road sizing run, but tire clearance and gravel cockpit choices can still change the better between-sizes call.
Cervélo P5 geometry page
P5 · 2025
Measurement basis: Published frame geometry plus the current pad-stack and pad-reach fit coordinates on the P5 model page.
Reviewed: 2026-09-10
Still uncertain: The P5 should not be sized from road height charts alone. Use your aero coordinates or a fitter's numbers before you translate a road-bike size across.

Check next

Use your inseam to see whether the smaller or larger Cervélo number deserves the first test, then compare that result with the exact model geometry.

Check the road bike size calculator

Cervélo keeps the size labels simple, but the ride position still changes a lot by frame family. The Caledonia-5 sits taller than the R5, the S5 gives you less room to fix a sizing miss after purchase, and the P5 needs pad-stack and pad-reach numbers rather than height alone.

Jump to Cervélo size chart ↓

Cervélo Size Charts by Category

Cervélo Road Bike Size Chart

Size	Height Range	Inseam Range
48	5'2" - 5'5"(157 - 166 cm)	27.6" - 29.5"(70 - 75 cm)
51	5'5" - 5'8"(164 - 172 cm)	29.1" - 31.1"(74 - 79 cm)
54	5'7" - 5'10"(170 - 179 cm)	30.7" - 32.7"(78 - 83 cm)
56	5'10" - 6'1"(177 - 185 cm)	32.3" - 34.3"(82 - 87 cm)
58	6'0" - 6'3"(183 - 191 cm)	33.9" - 35.8"(86 - 91 cm)
61	6'2" - 6'7"(189 - 200 cm)	35.4" - 38.2"(90 - 97 cm)

Height: 5'2" – 5'5" (157–166 cm)

Inseam: 27.6" – 29.5" (70–75 cm)

Height: 5'5" – 5'8" (164–172 cm)

Inseam: 29.1" – 31.1" (74–79 cm)

Height: 5'7" – 5'10" (170–179 cm)

Inseam: 30.7" – 32.7" (78–83 cm)

Height: 5'10" – 6'1" (177–185 cm)

Inseam: 32.3" – 34.3" (82–87 cm)

Height: 6'0" – 6'3" (183–191 cm)

Inseam: 33.9" – 35.8" (86–91 cm)

Height: 6'2" – 6'7" (189–200 cm)

Inseam: 35.4" – 38.2" (90–97 cm)

Cervélo Gravel Bike Size Chart

Size	Height Range	Inseam Range
48	5'2" - 5'5"(157 - 166 cm)	27.6" - 29.5"(70 - 75 cm)
51	5'5" - 5'8"(164 - 173 cm)	29.1" - 31.1"(74 - 79 cm)
54	5'7" - 5'11"(171 - 180 cm)	30.7" - 33.1"(78 - 84 cm)
56	5'10" - 6'1"(178 - 186 cm)	32.7" - 34.6"(83 - 88 cm)
58	6'0" - 6'4"(184 - 193 cm)	34.3" - 36.2"(87 - 92 cm)
61	6'3" - 6'7"(191 - 200 cm)	35.8" - 38.2"(91 - 97 cm)

Height: 5'2" – 5'5" (157–166 cm)

Inseam: 27.6" – 29.5" (70–75 cm)

Height: 5'5" – 5'8" (164–173 cm)

Inseam: 29.1" – 31.1" (74–79 cm)

Height: 5'7" – 5'11" (171–180 cm)

Inseam: 30.7" – 33.1" (78–84 cm)

Height: 5'10" – 6'1" (178–186 cm)

Inseam: 32.7" – 34.6" (83–88 cm)

Height: 6'0" – 6'4" (184–193 cm)

Inseam: 34.3" – 36.2" (87–92 cm)

Height: 6'3" – 6'7" (191–200 cm)

Inseam: 35.8" – 38.2" (91–97 cm)

Between two Cervélo sizes?

This road chart provides a starting range, not final fit. Smaller does not always mean racier, and larger does not guarantee comfort. Verify exact model-year geometry.

Rider and riding context

Height (cm)Cycling inseam (cm)

Riding style and terrainTorso and arm proportionsMobility and riding position

Check sustainable reach and brake access on long rides, including when tired. Do not judge fit from a brief seated pose alone.

Height alone cannot establish torso or arm reach. Compare comfortable contact points or ask a fitter to measure them. Check mounting, stopping and sustained posture; do not infer mobility from age or height.

Exact-bike evidenceModel, model year and frame variantEvidence source (reported by you)

Check both sizes for standover and mounting, saddle range, reach and stack, brake access, wheelbase and handling in your chosen riding position. These are your reports, not independently verified model data.

Not enough evidence

Enter height from 120 to 220 cm and cycling inseam from 50 to 120 cm, shorter than your height.

Adjustment boundaries

Respect seatpost minimum insertion, saddle rail marks, and fork and stem spacer limits. Set the saddle for pedaling, not to repair handlebar reach. A stem change cannot fix unsafe standover or unavailable bar height. Stop if pain, numbness, brake access or handling remains a problem and consult a fitter; persistent symptoms also need medical advice.

Compare exact geometry Check the two-size framework Prepare for a professional fit Calculate a starting size Back to the chart

Popular Cervélo Models & Sizing Notes

Specific sizing recommendations for Cervélo's most popular bike models. Geometry measurements shown for reference size (typically M or 54cm).

Cervélo R5

🚴 Road Bike • 2025

$5,500 - $14,000

Lightweight all-round race bike with balanced geometry for climbing and fast road riding. Riders between sizes often start with the smaller frame for a racier position, then confirm the reach against their current cockpit and flexibility.

Stack: 532mmReach: 388mm

Cervélo S5

🚴 Road Bike • 2025

$6,000 - $15,000

Aero road bike designed for flat and rolling terrain. The integrated handlebar limits how much stack you can change after purchase, so it is worth checking the published geometry carefully before you choose between two close sizes.

Stack: 522mmReach: 393mm

Cervélo Caledonia-5

🚴 Road Bike • 2025

$3,500 - $10,000

Endurance road bike with a taller head tube and more relaxed steering geometry than the R5. Designed for long-distance comfort with standard round seatpost for easy saddle height adjustment.

Stack: 570mmReach: 374mm

Cervélo Aspero-5

🏔️ Gravel Bike • 2025

$3,800 - $9,500

Race-oriented gravel bike with dropped chainstays for tire clearance up to 42mm. The fit is close to Cervélo's road range, so many riders start with the same numeric size they use on an R5 or Caledonia-5, then confirm the gravel cockpit and tire setup before ordering.

Stack: 560mmReach: 380mm

Cervélo P5

🚴 Road Bike • 2025

$7,000 - $16,000

Triathlon and time trial superbike with fully integrated storage and hydration. Unique tri-specific geometry with steep seat tube angle-sizing is based on effective top tube length and pad reach, not traditional road measurements.

Stack: 495mmReach: 410mm

Cervélo Sizing Tips

How to Measure

• Height: Stand barefoot against a wall and measure from floor to top of head
• Inseam: Stand barefoot with feet 6 inches apart, press a level book firmly upward, and measure from the floor to its top edge
• Arm Reach: For road bikes, measure from shoulder to fingertips

When Between Sizes

• Comfort priority: Choose the larger size
• Performance priority: Choose the smaller size
• Long torso: Size up for better reach
• Long legs: Size down for better standover

Cervélo Sizing FAQ

Accessories for Cervélo bikes

Helmets, saddles, lights and locks that fit any Cervélo build.

Bell

Bell Nomad 2 MIPS

This ASIN is Small/Medium 52-57 cm. Check the selected Amazon size/color before checkout.

$48.714.5

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Avasta

AVASTA Kids Bicycle Saddle

Standard saddle rail spacing fits most kids' seatpost clamps. Designed primarily for 12-20" wheel kids' bikes; larger riders may prefer a wider adult saddle.

$19.994.7

View on Amazon

Bell

Bell Lumina 300 Headlight

Tool-free handlebar mount; check bar space around computers, bells, and baskets.

$15.494.3

View on Amazon

Abus

ABUS Granit X-Plus 540

Inner dimensions: 5.5" x 8" (14 x 20cm). Premium size for frame + wheel security. Heavy-duty for high-theft areas.

$155.00

View on Amazon

Bivo

Bivo Duo 25 oz Stainless Bottle

Fits most major cages, but the 77 mm maximum diameter is a touch larger than a standard plastic bottle. Check tight side-load cages on very small frames.

$44.00

View on Amazon