Corbeau size their composite buckets Standard or XL, and the rule for choosing is one line long. The System number is the shell material, not the size.
How Corbeau size their seats
Corbeau’s own guidance for the Sprint X, Pro-Series X, Revenge X, Revolution X and RXC X is Standard up to a 34 inch waist and XL from 34 inch. Our product pages band them as Standard 32 to 36 and XL 36 to 40, which is the same rule with room either side. A 34 to 36 inch waist is the crossover: if you carry your weight on your hips take the XL, if you are tall and lean the Standard.
System 1, 3 and 5 are the shell layup. System 1 is GRP and Kevlar, System 3 Kevlar and carbon, System 5 full carbon. The shape and the sizes are the same across all three, so pick the size first and the System on weight and budget.
The Sportline reclining seats (RRS, RRB, SVR, VLS, Dakota and the rest) are one size for a 32 to 38 inch waist. The Classic bucket comes in Standard and Excel width, the Excel being the wider shell.
Which Corbeau fits you
Low Base versionsThe RRS Low Base and VLS Low Base are the same shell on a lower frame. Choose them for headroom, not for width.
All the X-range buckets mount through Corbeau Pro-Team side mounts with M10 12.9 fixings. The side mounts come in four angles (35 degree, 90 degree, 90 degree extended and restricted space), which is the car’s decision rather than the driver’s.
Measure yourself first
Four numbers decide whether a seat fits. Take them in the clothes you drive in, and write them down before you compare models.
AWaistAround your natural waist, not your trouser size. Trouser sizes usually run an inch or two under the real figure, and the waist bands on our product pages use the real one.
BSeated hip widthSit on a hard chair with your feet flat and measure straight across the widest point of your hips with a rule or a straight edge, not a tape that follows the curve. This is the number that decides whether a fixed shell is tight.
CShouldersStraight across the back at the widest point. Fixed back seats hold you here, so a shell that is narrow at the shoulders is uncomfortable long before it is unsafe.
DHeight and torsoYour height, and if you are over 6 ft whether that is mostly leg or mostly body. A long body needs a taller shell with the head support set higher.
Before you order
- Check the car, not only the driver. Transmission tunnels, door cards and B pillars are what stop a wide shell going in. Our seat mounting and fixing points guide covers what to measure.
- Side mount and base mount shells are not interchangeable. Which one you need depends on the car and the subframe, so pick the brackets at the same time as the seat.
- If you run a HANS or plan to, filter on HANS friendly. The shoulder openings are cut to clear the collar.
- FIA seats carry an expiry date on the homologation label. Check what your championship accepts and how long the seat has left, particularly on discounted older stock.
Send us your measurementsWaist, seated hip width, height and the car. We have fitted a lot of Corbeau seats and will tell you honestly if the one you have picked is going to be tight. Call 0115 989 3488 or email Sales@GSMPerformance.co.uk.
Waist bands and heights are our product data, checked 6 September 2026. The Standard to 34 inch, XL from 34 inch rule and the System layups are from corbeau-seats.com, read the same day.
