Fit & Sizing

Get the Right Fit

A helmet can only protect you if it fits. Every Biltwell lid meets DOT and ECE 22.06 safety standards — but the size and fit are on you to get right. Here's how to measure, choose your size, and fine-tune the fit.

Step 1

Measure Your Head

Different brands marked with the same size can fit very differently — being an M in one helmet doesn't make you an M in a Biltwell. Always measure before you buy.

Wrap a soft tape measure around the widest part of your head — roughly 2.5 cm (1 inch) above your eyebrows and ears. Take the measurement a few times and use the largest reading. This is your head circumference, and it's what you match to the model charts below.

Don't confuse the numbers. The cm figure printed on the tag inside a Biltwell helmet is the helmet's interior circumference — not your head measurement. Measure your own head with a tape and match it to the chart.

Step 2

Choose Your Size

Biltwell helmets we stock run from S to XXL. Measure your head, then match it to the size below. Head measurement is the most accurate way to choose — if you're between sizes, get in touch before ordering.

Helmet Size	Metric Range (cm)	Head Measurement (in)	Approx. Fitted Hat Size*
S	55–56	21.5–22.0	6-7/8 to 7-1/8
M	57–58	22.4–22.85	7-1/8 to 7-3/8
L	59–60	23.25–23.6	7-3/8 to 7-5/8
XL	61–62	23.75–24.25	7-5/8 to 7-7/8
XXL	63–64	24.375–25.0	7-7/8 to 8-1/8

* Fitted hat sizes vary widely by head shape, hair volume and manufacturer — your head measurement is the most accurate way to choose a size. Chart applies to Lane Splitter, Gringo, Gringo S and Gringo SV (ECE R22.06). Source: official Biltwell Helmet Sizing Chart.

Official Sizing Charts

Tap any chart to view it full size.

Lane Splitter sizing chart — Lane Splitter

Gringo / Gringo S / Gringo SV sizing chart — Gringo / Gringo S / Gringo SV

Step 3

Check the Fit

Never ride in a helmet that doesn't fit snugly and correctly. Once your helmet arrives, run this quick test:

Grasp both loose neck straps, one in each hand.
Put the opening of the helmet on top of your head and pull the straps gently outward and down until your head is firmly and comfortably inside. Don't fasten the strap yet.
Stiffen your neck to hold your head still, eyes forward.
Grip the chin bar with both hands and move the helmet gently but firmly side to side, then up and down.

✓

Correct fit

The helmet moves the skin on your cheeks and forehead with it, without rotating on your head.

↑

Too tight

Pressure or pain anywhere — especially forehead or temples. Try the next size up.

↓

Too loose

The helmet slides around easily without moving your skin. Try the next size down.

Step 4

Fine-Tune with Cheek Pads

Stock cheek pads are chosen to suit a wide range of face shapes across all six sizes — but everyone's different (beards, ears, cheeks all play a part). If the shell size is right but the fit feels slightly off, swapping cheek pads is the fix, not changing helmet size.

Find your model and size in the chart to see the stock pad thickness, then go thinner if it's too tight or thicker if it's too loose. (Example: a Medium Gringo S ships with 19 mm pads — drop toward 15/10/5 mm for a looser feel, or step up to 24 mm and beyond for a snugger one.) Part numbers are shown under each thickness.

Gringo, Gringo S & Gringo SV — Customize Your Fit

Helmet size	Small	Medium	Large	XL	XXL
Stock cheek pads	24mm0023-020-0124	19mm0023-020-0119	19mm0023-020-0119	15mm0023-020-0115	10mm0023-020-0110
Thinner — looser fit	5mm0023-020-010510mm0023-020-011015mm0023-020-011519mm0023-020-0119	5mm0023-020-010510mm0023-020-011015mm0023-020-0115	5mm0023-020-010510mm0023-020-011015mm0023-020-0115	5mm0023-020-010510mm0023-020-0110	5mm0023-020-0105
Thicker — tighter fit	29mm0023-020-012933mm0023-020-013338mm0023-020-0138	24mm0023-020-012429mm0023-020-012933mm0023-020-013338mm0023-020-0138	24mm0023-020-012429mm0023-020-012933mm0023-020-013338mm0023-020-0138	19mm0023-020-011924mm0023-020-012429mm0023-020-012933mm0023-020-013338mm0023-020-0138	15mm0023-020-011519mm0023-020-011924mm0023-020-012429mm0023-020-012933mm0023-020-013338mm0023-020-0138
Replacement liner kit	0023-131-5702	0023-131-5703	0023-131-5704	0023-131-5705	0023-131-5706

Lane Splitter — Customize Your Fit

Helmet size	Small	Medium	Large	XL	XXL
Stock cheek pads	24mm0004-020-0124	29mm0004-020-0129	24mm0004-020-0124	19mm0004-020-0119	15mm0004-020-0115
Thinner — looser fit	5mm0004-020-010510mm0004-020-011015mm0004-020-011519mm0004-020-0119	5mm0004-020-010510mm0004-020-011015mm0004-020-011519mm0004-020-011924mm0004-020-0124	5mm0004-020-010510mm0004-020-011015mm0004-020-011519mm0004-020-0119	5mm0004-020-010510mm0004-020-011015mm0004-020-0115	5mm0004-020-010510mm0004-020-0110
Thicker — tighter fit	29mm0004-020-012933mm0004-020-013338mm0004-020-0138	33mm0004-020-013338mm0004-020-0138	29mm0004-020-012933mm0004-020-013338mm0004-020-0138	24mm0004-020-012429mm0004-020-012933mm0004-020-013338mm0004-020-0138	19mm0004-020-011924mm0004-020-012429mm0004-020-012933mm0004-020-013338mm0004-020-0138
Replacement liner kit	0004-012-5702	0004-012-5703	0004-012-5704	0004-012-5705	0004-012-5706

Replacement liner kits include the stock cheek pads for that size. Charts transcribed from Biltwell's official cheek-pad fitment charts.

Shop cheek pads & helmet accessories →

Two rules. Give a new helmet time to break in before deciding to change pads — the liner softens with use. And never cut, drill, sand, or modify any part of your helmet to change the fit; doing so destroys its ability to protect you in a crash.

Ready to Ride?

Measured up and know your size? Browse the range. Still not sure? We're happy to help you get it right.

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