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Solid Wheel Retro-fit Kit (2 Pack)

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Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.

A unisex sleeping bag with a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.

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Upgrade the existing wheels on your Sea to Summit boat cart using the Solid Wheel Retro-fit Kit. These molded wheels feature a thermoplastic rubber outer surface, so they roll smoothly and quietly. They are designed to withstand the most rugged terrain without the possibility of punctures. Kit includes 2 wheels with pre-installed hub sleeves.


  • To upgrade Sea to Summit Small, Medium and Large boat carts purchase the 25mm hub kit
  • To upgrade Sea to Summit Sit on Top Kayak Cart purchase the 35mm hub kit

Can the Retro-Fit Wheels...?

  • Fit in a sea kayak hatch? The wheels measure 9.85 inches / 25cm in diameter. They should just fit into a 10” hatch.

  • Be used on soft sand? Possibly not. On very fine-grain sand the rim of the wheel will sink and the spokes will become clogged with sand.

  • Be used for kayak carts made by other manufacturers? Probably not. To determine if these wheels will fit your cart, measure the external diameter of the axle: “25mm” or “35mm” refers to the interior diameter of the wheel hub.

Tech Specs

Product Details

Best Use
Boat cart wheel upgrade
Thermoplastic rubber outer surface
Small, Medium and Large boat carts
2.2 lbs / 1 kg
Sit on top kayak cart
2.2 lbs / 1 kg
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