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How To Adjust And Care For Your Giro Helmet

The helmet sits squarely on your head to protect your face and forehead.


A Giro helmet can only protect you if it fits well. Make sure you try on different sizes and choose the size which feels secure and comfortable on your head. If properly fitted, this helmet is designed to stay on your head in an accident. To customize the fit use the enclosed adhesive-backed sizing pads.

First, position the helmet on your head so that the front is level with the back and parallel to the ground. Your helmet should not be tilted back on your head (figure 1). When the helmet is level with your head you want both the front and rear straps to be even, with the Tri Loc strap guides positioned just below the ears (figure 2). If your straps are uneven they can be adjusted by pulling them through the rear of the helmet.

To adjust the length of the straps open the Tri Loc and slide whichever strap needs adjustment up or down until it is in the correct position. Any slack in the strap must be pulled through the chin buckle. Then snap the Tri Loc closed and adjust the other side. The loose ends of the straps must be passed through the rubber O-ring. The straps should not cover your ears.

Next, close the chin buckle and tighten the combined straps until they are comfortable underneath your chin. Position the buckle away from your jaw bone. To see if your straps are correctly adjusted try to pull the helmet off from both the front and back. If it can be tipped forward, tighten the back straps. If it can be tipped backwards tighten the front straps.

Your helmet may come with either the Roc Loc or Acu Loc Giro patented fit and stabilizing system. As with any new piece of equipment you should experiment with the adjustment of your Roc Loc or Acu Loc before using the helmet on the road or the trail.

To adjust any of our Roc Loc systems, follow these steps:

Roc Loc Mini
To tighten the Roc Loc Mini, detach the headband from the Velcro fasteners and move the ends of the headband towards the front of the helmet. Firmly reattach the headband to the Velcro fasteners. To loosen the Roc Loc Mini, reattach the headband closer to the rear of the helmet (figure 3).

Roc Loc 3
To tighten the Roc Loc 3, unsnap both Roc Loc arms from the helmet and move the ends towards the front of the helmet. Firmly reattach the arms of the Roc Loc in the front snaps (figure 4). To loosen, unsnap the arms from the helmet and move the ends of the arms towards the back of the helmet. Firmly reattach the arms of the Roc Loc in the rear snaps (figure 4).

The Roc Loc 3 also allows on-the-head tension adjustments. To tighten, push the Roc Loc buttons towards each other (figure 5). To loosen, pull the buttons away from each other (figure 6). For your safety, we recommend that you do NOT adjust the Roc Loc while riding.

Roc Loc 4
The Roc Loc 4 allows on-the-head tension adjustment, too. To tighten, slide the Roc Loc buttons towards each other (figure 5). To loosen, push the buttons and slide them away from each other (figure 6). For your safety, we recommend that you do NOT adjust the Roc Loc while riding.

Height adjustment
The Roc Loc 3 and the Roc Loc 4 are equipped with a height adjustment mechanism. Move the Roc Loc arms up or down until they are most comfortable for you (figure 7). For the optimum fit and safety, make sure that both tabs are in the same position.

To adjust the Acu Loc system, follow these steps. The Acu Loc allows on-the-head tension adjustment. To tighten the Acu Loc, push the arms together (figure 5). To loosen, push in the Acu Loc buttons and pull the arms away from each other (figure 6). For safety we recommend that you do NOT adjust the Acu Loc while riding.

The Roc Loc and the Acu Loc are designed to enhance the fit and stability of your helmet. It is not a replacement for your helmet’s straps. Do not attempt to remove either the Roc Loc or the Acu Loc from your helmet; doing so will void all of the helmet’s warranties.

Now your helmet fits properly. Be sure to check the adjustment of your helmet before each ride.

The Tri Loc strap guides should be just below your ears.

Please Read Carefully

  • This helmet is intended only for pedal cyclists, skateboarders or rollerskaters, as specified in the helmet marketing. It is not intended for motorsport, moped or other uses.
  • Any helmet subjected to a violent impact should be discarded and destroyed, although helmet damage may not always be evident. In addition, it is recommended that helmets be replaced after 3 years from the date of purchase, or if it does not fit you any more. Because this helmet is made of expanded polystyrene foam, there's a chance it may be penetrated by sharp objects.
  • Do not modify or remove any original component parts of your helmet, other than as recommended by Giro. Doing so voids all Giro warranties. Some Giro styles of helmet are supplied with a removable visor. The attachment of these visors is not detrimental to the helmet material. While the visors themselves do not offer impact protection, they do not influence the safety performance of the helmets.
  • No helmet can protect the wearer from all foreseeable accidents, including those involving bicycle to motor vehicle collisions. Depending on the type of impact even a very low speed accident can result in a serious head injury or fatality. This helmet is designed to protect the head and cannot guard against cervical, spine or other bodily injuries that may result from an accident.
  • The helmets should not be used by children while climbing or in other play activities, where a risk of strangulation exists.
  • Please exercise care and good judgment whenever you ride. Comply with all traffic regulations and do your part to avoid accidents of any kind.

By moving the ends forward or back, fine-tune the tension.

By moving the ends forward or back, fine-tune the tension.

To tighten, push the Roc Loc buttons towards each other.

To loosen, push the buttons and slide them away from each other.                                    Move the Roc Loc arms up or down until they are most comfortable for you.

High temperatures will melt a Giro hardbody shell. Do not leave your helmet in your car or anywhere else near direct or indirect heat. If your helmet deteriorates as a result of exposure to heat it is not covered by any Giro warranty. We recommend cleaning your helmet with mild soap and water, and a soft cloth or sponge. Do not use ammonia or solvent-based products.

If your Giro helmet is damaged in an accident within three years from its date of purchase, Giro will replace it for a fee*. All we ask is that you send the Giro distributor in your country the helmet along with your proof of purchase, a check or money order, and a letter explaining what happened. *The conditions of this offer vary from country to country. Contact your Giro distributor for program details. Giro reserves the right to change the replacement model, color, or price due to product-line changes in the future.

Giro warrants to the original purchaser of this product that the product is free of defects in material and workmanship for a period of one year from the original date of purchase. This warranty does not apply to defects of physical damage resulting from abuse, neglect, improper repair, improper fit, alterations, or use unintended by the manufacturer.

If your Giro helmet is found to be defective in materials or workmanship within one year from the date of purchase, the Giro distributor will, at its sole option either repair or replace the helmet free of charge. Just bring it in to us with a letter indicating the specific reasons you are returning the helmet, and proof of date of purchase. We'll then evaluate the claim.

Giro does not warranty any helmet damaged due to heat or contact with solvents.

This warranty does not affect your statutory rights. This warranty is in lieu or all other agreements and warranties, general or special, express or implied and no representative or person is authorized to assume liability on behalf of Giro in connection with the sale or use of this product.