Neutron Lightweight MK2 Cassette - 12 speed

The Neutron Lightweight MK2 Cassette - 12 speed is a super-light, CNC-machined cassette that offers silent operation and precise shifting, overcoming the noise and precision issues of the first version. It is currently available only in an 11-34 ratio, with other ratios planned. The single reviewer praises its performance and build quality, making it a compelling upgrade for weight-conscious climbers.

Pros

Extremely lightweight (185 grams for 11-34 12-speed including lockring)1
Silent operation comparable to original groupset cassettes (e.g., Shimano Dura-Ace, SRAM Red)1
Precise shifting across all gears, including middle cogs1
High-quality CNC-machined construction from a single block1
Available in multiple color options1
No resonance chamber effect due to design improvements1
Easy to adjust after installation1
Fluid and reliable shifting performance1

Cons

Currently only available in 11-34 ratio, which may not suit all riders1
Initial version had issues with noise and shifting precision (resolved in MK2)1
Other versions are still in development and not yet on the market1

Key Facts

Weighs 180 grams without lockring, 185 grams with lockring (11-34, 12-speed)1
12-speed cassette with 11-34 tooth range1
CNC-machined from solid material (CNC steel)1
Future ratios planned: 11-30, 11-28, 11-251
Design addresses resonance noise by covering from the second cog onward1
Last two cogs available in various colorations1
Developed over 2 years with a first version that had problems and a refined second version1

Sources

1
TheItalianCyclingVLOG🇮🇹2 sources

Reviews & Ratings

TheItalianCyclingVLOG🇮🇹2 videos

18:19

Zero Rumore, Massima Performance: Il Capolavoro di Neutron Bike! La cassetta Superleggera perfetta

The reviewer presents the Neutron Lightweight MK2 Cassette - 12 speed as a significant upgrade for his climbing bike. He praises its lightweight construction, silent operation, and precise shifting, noting that it overcomes the common issues of excessive noise and poor shifting precision found in other lightweight cassettes. He highlights its CNC-machined quality and mentions that it is currently available in an 11-34 ratio, with future ratios planned.

July 20, 2025Watch on YouTube

11:52

Upgrade leggerissimi + Sconti esclusivi! Cassetta Superleggera Neutron e Staffa in titanio Samassi

The reviewer discusses the Neutron Lightweight MK2 Cassette (referred to as Neutron Bike cassette) as a super lightweight cassette made from CNC steel, noting that it is currently only available in an 11-34 version with colored top two cogs, and that other versions are in development until they outperform original cassettes.

October 05, 2025Watch on YouTube

Codes from reviewers

TheItalianCyclingVLOG🇮🇹neutron.bikeANDREAMARINI

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