diff --git a/CHANGELOG.md b/CHANGELOG.md
index 459e9f0d00..457e61bd31 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 
 - Add `cumulus-pallet-weight-reclaim` to all Kusama system parachains for storage weight reclaim functionality ([#941](https://github.com/polkadot-fellows/runtimes/pull/941))
+- asset-hub-kusama: use inmemorydb weights([polkadot-fellows/runtimes/pull/918](https://github.com/polkadot-fellows/runtimes/pull/918))
 
 ## [2.0.3] 21.11.2025
 
diff --git a/system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs b/system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs
index 1ececfb4ec..1e728ab530 100644
--- a/system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs
+++ b/system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs
@@ -115,7 +115,7 @@ use system_parachains_constants::{
 		fee::WeightToFee,
 	},
 };
-use weights::{BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight};
+use weights::{BlockExecutionWeight, ExtrinsicBaseWeight, InMemoryDbWeight};
 use xcm::{
 	latest::prelude::*, Version as XcmVersion, VersionedAsset, VersionedAssetId, VersionedAssets,
 	VersionedLocation, VersionedXcm,
@@ -198,7 +198,7 @@ impl frame_system::Config for Runtime {
 	type RuntimeTask = RuntimeTask;
 	type RuntimeOrigin = RuntimeOrigin;
 	type BlockHashCount = BlockHashCount;
-	type DbWeight = RocksDbWeight;
+	type DbWeight = InMemoryDbWeight;
 	type Version = Version;
 	type PalletInfo = PalletInfo;
 	type OnNewAccount = ();
diff --git a/system-parachains/asset-hubs/asset-hub-kusama/src/weights/inmemorydb_weights.rs b/system-parachains/asset-hubs/asset-hub-kusama/src/weights/inmemorydb_weights.rs
new file mode 100644
index 0000000000..abc9dcf6ee
--- /dev/null
+++ b/system-parachains/asset-hubs/asset-hub-kusama/src/weights/inmemorydb_weights.rs
@@ -0,0 +1,108 @@
+//! THIS FILE WAS AUTO-GENERATED USING THE SUBSTRATE BENCHMARK CLI VERSION 49.1.0
+//! DATE: 2025-09-10 (Y/M/D)
+//! HOSTNAME: `versi-developer-0`, CPU: `Intel(R) Xeon(R) CPU @ 2.60GHz`
+//!
+//! DATABASE: `InMemoryDb`, RUNTIME: `Polkadot Asset Hub`
+//! BLOCK-NUM: `BlockId::Number(9640792)`
+//! SKIP-WRITE: `false`, SKIP-READ: `false`, WARMUPS: `1`
+//! STATE-VERSION: `V1`, STATE-CACHE-SIZE: ``
+//! WEIGHT-PATH: ``
+//! METRIC: `Average`, WEIGHT-MUL: `1.0`, WEIGHT-ADD: `0`
+
+// Executed Command:
+//   ./target/production/polkadot-parachain
+//   benchmark
+//   storage
+//   --warmups
+//   1
+//   --state-version
+//   1
+//   --base-path
+//   /opt/local-ssd/polkadot-asset-hub/
+//   --chain
+//   cumulus/polkadot-parachain/chain-specs/asset-hub-polkadot.json
+//   --detailed-log-output
+//   --enable-trie-cache
+//   --trie-cache-size
+//   10737418240
+//   --batch-size
+//   10000
+//   --mode
+//   validate-block
+//   --validate-block-rounds
+//   100
+
+/// Storage DB weights for the `Polkadot Asset Hub` runtime and `InMemoryDb`.
+pub mod constants {
+	use frame_support::weights::constants;
+	use sp_core::parameter_types;
+	use sp_weights::RuntimeDbWeight;
+
+	parameter_types! {
+		/// `InMemoryDb` weights are measured in the context of the validation functions.
+		/// To avoid submitting overweight blocks to the relay chain this is the configuration
+		/// parachains should use.
+		pub const InMemoryDbWeight: RuntimeDbWeight = RuntimeDbWeight {
+			// Time to read one storage item.
+			// Calculated by multiplying the *Average* of all values with `1.0` and adding `0`.
+			//
+			// Stats nanoseconds:
+			//   Min, Max: 13_036, 14_636
+			//   Average:  13_701
+			//   Median:   13_739
+			//   Std-Dev:  327.35
+			//
+			// Percentiles nanoseconds:
+			//   99th: 14_322
+			//   95th: 14_185
+			//   75th: 13_962
+			read: 13_701 * constants::WEIGHT_REF_TIME_PER_NANOS,
+
+			// Time to write one storage item.
+			// Calculated by multiplying the *Average* of all values with `1.0` and adding `0`.
+			//
+			// Stats nanoseconds:
+			//   Min, Max: 31_957, 34_238
+			//   Average:  33_060
+			//   Median:   33_048
+			//   Std-Dev:  230.45
+			//
+			// Percentiles nanoseconds:
+			//   99th: 33_927
+			//   95th: 33_440
+			//   75th: 33_157
+			write: 33_060 * constants::WEIGHT_REF_TIME_PER_NANOS,
+		};
+	}
+
+	#[cfg(test)]
+	mod test_db_weights {
+		use super::InMemoryDbWeight as W;
+		use sp_weights::constants;
+
+		/// Checks that all weights exist and have sane values.
+		// NOTE: If this test fails but you are sure that the generated values are fine,
+		// you can delete it.
+		#[test]
+		fn bound() {
+			// At least 1 µs.
+			assert!(
+				W::get().reads(1).ref_time() >= constants::WEIGHT_REF_TIME_PER_MICROS,
+				"Read weight should be at least 1 µs."
+			);
+			assert!(
+				W::get().writes(1).ref_time() >= constants::WEIGHT_REF_TIME_PER_MICROS,
+				"Write weight should be at least 1 µs."
+			);
+			// At most 1 ms.
+			assert!(
+				W::get().reads(1).ref_time() <= constants::WEIGHT_REF_TIME_PER_MILLIS,
+				"Read weight should be at most 1 ms."
+			);
+			assert!(
+				W::get().writes(1).ref_time() <= constants::WEIGHT_REF_TIME_PER_MILLIS,
+				"Write weight should be at most 1 ms."
+			);
+		}
+	}
+}
diff --git a/system-parachains/asset-hubs/asset-hub-kusama/src/weights/mod.rs b/system-parachains/asset-hubs/asset-hub-kusama/src/weights/mod.rs
index 5c85ac77b6..bbbf5d083b 100644
--- a/system-parachains/asset-hubs/asset-hub-kusama/src/weights/mod.rs
+++ b/system-parachains/asset-hubs/asset-hub-kusama/src/weights/mod.rs
@@ -45,6 +45,7 @@ pub mod pallet_remote_proxy;
 pub mod pallet_society;
 // TODO(#840): uncomment this so that pallet-revive is also benchmarked with this runtime
 // pub mod pallet_revive;
+pub mod inmemorydb_weights;
 pub mod pallet_ah_migrator;
 pub mod pallet_ah_ops;
 pub mod pallet_bags_list;
@@ -73,4 +74,4 @@ pub mod xcm;
 
 pub use block_weights::constants::BlockExecutionWeight;
 pub use extrinsic_weights::constants::ExtrinsicBaseWeight;
-pub use rocksdb_weights::constants::RocksDbWeight;
+pub use inmemorydb_weights::constants::InMemoryDbWeight;