Bell Sidetrack II Mips review

Bell's Sidetrack II Mips is a child half-shell the exact US page describes for all-mountain riding. The observed product card resolves style 100000001400000304 to Matte White / UY, SKU BL-7158335. Its page names Mips Evolve, an Ergo Fit dial, a removable visor and an age-five-plus US CPSC statement. Bell's published chart shows a Universal Child range of 47–54 cm and a Universal Youth range of 50–57 cm; the overlapping intervals are distinct plans, not a personal fit result.

Two available sizes and an overlapping chart

The current US selector offers UC and UY. Bell's chart also displays a Universal Toddler row at 45–52 cm, but the exact product page does not offer a toddler size in its current controls. This assessment therefore uses only the available UC and UY plans. UC covers 47–54 cm and UY covers 50–57 cm; from 50 through 54 cm, both labels fall inside their chart intervals. That overlap signals a need to try the specific shells, not an automatic choice of one size.

Bell's general guidance says to measure carefully, position the helmet correctly, fasten the retention system and check whether the shell can be moved forward or back. It calls for a different size or model if the helmet cannot be fitted properly. A chart match is a useful screening point, not proof that a child's head shape matches the shell or that the helmet stays in place during every activity. No head-shape profile, independent fitting study or pressure measurement was captured.

What the Mips and adjustment labels tell us

Bell names Mips Evolve and describes it as integrated with the Ergo Fit system. It also lists No-Twist Tri-Glides and Sweat Guide padding. These details distinguish the Sidetrack II Mips from the non-Mips Sidetrack II identity and help a caregiver know what to inspect. They do not turn Mips Evolve into Bell Spherical Technology, so a shopper requiring Spherical/Mips should not count this exact model for that request.

The page calls the helmet all-mountain and says it offers more all-around coverage. That makes it a more directly documented trail choice than the Lil Ripper's trailer/learning-to-ride description or the Span's skate/BMX framing. It remains an open-face bicycle helmet, not a full-face downhill design. Bell's manual also warns that the generic helmet may not suit extreme riding such as jumping or high-speed descents; that is a manufacturer caution, not a test result about this particular unit. Choose equipment against the actual discipline and instructions, rather than relying on the “all-mountain” label alone.

Standards and weight evidence

The exact US page states compliance with the CPSC bicycle-helmet standard for people age five and older. That affirmative text supports the CPSC filter, but it does not verify a seller's specific unit or decide the fit of the child wearing it. Inspect the physical helmet label and verify that the offered item is style 100000001400000304 in the intended size.

Bell lists 360 g for size Y. The figure is manufacturer-published and size-specific; it is not a weight measured for this review and should not be transferred to the selected UY SKU. The page does not give a numeric vent count, a measured cooling result or an independent impact comparison. A visible visor, moisture-management pad or Mips label describes components, not a guaranteed outcome.

How it differs from Bell's other child models

The four models from Bell's one-page Kids and Youth directory are not color variants of one another. The 2Twenty Youth Mips shares Mips Evolve wording and trail context, but its exact chart has no circumference bridge. Lil Ripper is described for trailer use or early independent riding and has no named Mips architecture or captured centimeter range. Span is the skate/BMX dual-standard option and also lacks an exact circumference interval. Sidetrack II Mips is distinguished by the UC/UY chart, all-mountain wording, Ergo Fit/Mips combination, removable visor and stated CPSC age-five-plus compliance.

These differences are useful for narrowing a discussion, not for ranking protection or fit. The current product page does not state an airflow test, weight for every size or an anatomical fit shape. Its recall-screen note is limited: Bell's notice checked for this review names other models and does not identify Sidetrack II Mips, while the direct CPSC category request returned HTTP 403. Check current notices before buying, and be particularly careful with used equipment whose impact history is unknown.

When the Sidetrack II Mips belongs on a shortlist

Keep it in consideration when a child needs an all-mountain half-shell, the exact chart's 47–57 cm combined coverage is relevant, and Mips Evolve plus an age-five-plus CPSC statement meet the buyer's documented requirements. At 52 cm, both offered size plans match the chart screen. At 57.5 cm neither plan does. Neither result decides whether a real helmet fits; the exact shell and straps still need to be checked on the rider.

Confirm the offer is the US Matte White style-304 family, that the UC or UY size is actually supplied, and that the physical CPSC marking and current instructions match. Inspect the visor, straps, liner and fit system on the actual unit, and check return terms. Bell's exact Sidetrack II Mips page and chart, the bicycle-helmet manual and Bell recall notice are the primary references for this assessment.

Research note: No ownership, child fitting, riding, independent weighing, laboratory impact test, ventilation measurement or customer experience is claimed.