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Crossbars are a platform, not a single-purpose accessory — the same set can carry a cargo box one weekend and bikes the next, as long as you know the actual weight and mounting rules for each. This is a quick reference for what fits, and links to the full guide for whichever one you’re actually shopping for.
Cargo Boxes and Baskets
The most common crossbar accessory — enclosed boxes for weatherproof storage, open baskets for bulky or dirty gear. See our Roof Basket vs Roof Box guide to decide between them, or jump straight to the model-specific buyer guides for Outback, Forester, or Crosstrek.
Bikes
Roof-mounted bike trays are lighter on the weight budget than a cargo box, though a hitch-mounted rack is usually the better choice if you’re carrying more than one bike. See our model-specific guides for Outback, Forester, or Crosstrek, or our Hitch Rack vs Roof Rack comparison if you’re deciding between the two mounting styles.
Kayaks and Paddleboards
J-cradles and saddle mounts both work on standard crossbars — see our J-Cradle vs Saddle Kayak Carriers comparison, or the model-specific guides for Outback, Forester, and Crosstrek.
Skis and Snowboards
Dedicated ski/snowboard mounts clamp directly to the crossbars and are one of the lighter accessories on this list, weight-wise. See our model-specific guides for Outback, Forester, and Crosstrek.
Roof Tents and Awnings
The heaviest common crossbar accessories on this list — a roof tent especially needs crossbars rated for its full weight, not just a passing check. See our Roof Tent vs Ground Tent and Best Awning for Subaru guides for specifics.
You Can’t Mount Everything at Once
Total crossbar weight capacity is shared across whatever’s mounted — a cargo box and a bike rack together can exceed the rated limit even if each would be fine alone. Check your total combined load against your crossbar rating before assuming you can stack accessories. See our How Much Weight Can Subaru Crossbars Hold? guide for the details.
Common Mistakes
- Assuming crossbar capacity is per-accessory instead of total. Everything mounted at once shares the same weight budget.
- Mounting a roof tent on unrated crossbars. The single accessory on this list most likely to exceed a stock crossbar’s rating.
- Not checking compatibility before buying. Not every accessory clamps to every crossbar profile — confirm fit before ordering.
FAQs
What’s the heaviest thing you can put on Subaru crossbars?
Depends on the specific crossbar rating, but roof tents and fully-loaded cargo boxes are typically the heaviest common accessories.
Can I mount a cargo box and a bike rack at the same time?
Only if the combined weight of both, plus their contents, stays under your crossbar’s total rated capacity.
Do all crossbar accessories fit the same way?
Most modern accessories are designed for standard crossbar profiles, but always confirm compatibility with your specific crossbars before buying.
Final Thoughts
Crossbars are genuinely versatile — the same set handles cargo, bikes, water sports gear, and winter sports gear, just not all mounted at once past the weight limit. Know your total capacity, check compatibility, and the rest is picking the right accessory for the trip.
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