Grass strips are kinder to propellers than tarmac, but they’re not automatically kinder to landing gear — in some ways, quite the opposite.
Uneven ground concentrates shock loads unpredictably. A smooth tarmac landing spreads load evenly across a level surface. A grass strip with even minor undulation means one wheel can hit a slightly higher or lower point than the other on touchdown, putting an asymmetric load through the gear that a flat surface wouldn’t produce.
Longer or wetter grass adds drag exactly where you don’t want it — right at the wheel, right as the gear leg is already under load from touchdown. This is part of why wheel choice (see Day 7) matters as much as gear choice on grass strips specifically.
Rough or rutted ground rewards a slightly wider wheel and a slightly more generous gear stance if your model allows it — narrow, closely-spaced gear that’s fine on tarmac can feel noticeably twitchier on rough grass, with more load transmitted through each leg individually rather than shared smoothly.
A pre-flight walk of your usual strip is worth the two minutes it takes, especially early in the season after a wet winter — molehills, rabbit holes, and ruts that developed since your last visit are a common and entirely avoidable cause of hard, unexpected landing loads.
None of this means grass strips are bad for landing gear generally — most carbon fibre gear is more than capable of handling reasonable grass strip use for years. It just means the checks in Day 4 are worth doing slightly more often if grass is your regular home field, since the loading is genuinely less predictable than tarmac.
For a real-world example, have a look at our 1 Pair of Wheels with Plastic Hub for RC Airplane.