What wears out, and when
Frames outlast everything else on a trampoline, often by a decade. What ages is the soft material sitting in the sun: netting first, then rim padding, then the mat itself. Springs are usually the last thing to go and often never need replacing at all.
If your trampoline looks tired, it is almost always quicker and less disruptive to replace the two or three components that have perished than to start again.
Measuring for a replacement mat
Do not order by frame size alone. Measure the mat across from the outside of one V-ring to the outside of the ring directly opposite, then count the total number of V-rings. Two 12ft trampolines from different brands can take quite different mats, and the ring count is what distinguishes them.
Netting
Enclosure nets come in two mounting styles — those that attach to poles standing outside the frame, and those that mount inside the rim. They are not interchangeable, so check which your trampoline uses before ordering.
UV is what finishes netting off. A net that has gone chalky and stiff to the touch has reached the end of its working life even if there are no visible holes.
Springs
Springs are sold by hook-to-hook length, measured relaxed rather than stretched. If you are replacing a few, replace them in opposing pairs so the mat tension stays even across the frame.
Anchors and ladders
Anchor kits pin the frame to the ground and are worth having anywhere the wind gets up. Ladders are sized to frame height rather than diameter, so check the leg height rather than assuming.
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