BSUN Bubble 45g

Quick Summary

The BSUN Bubble 45g is a featherweight linear switch aimed at anyone who wants a smooth, clacky typing feel without spending boutique money. A light 45g actuation, factory lube and a notched light pipe for RGB make it an easy stock choice for a relaxed daily driver. If you like a controlled clack over a deep thock and prefer a soft, low-resistance keystroke, it’s a strong budget pick.

Specs and Feel

This is a linear through and through: no bump, no click, just a clean glide from top to bottom. Actuation lands at a light 45g with roughly 2.0mm of pre-travel and a slightly shortened 3.6mm total travel, so bottom-out comes a hair sooner than the MX-standard 4.0mm and keeps the typing motion snappy. The LY stem riding in a nylon housing gives a smooth, even downstroke with no noticeable scratch, and stem wobble is well within expectations for the price. The 21mm spring keeps the bottom-out soft rather than springy. Sound is the highlight: clacky and bright at the top end but controlled, never shrill or fatiguing over long sessions.

Tuning

Leave them stock. The factory lube already does the heavy lifting, and films aren’t needed on this housing. The one caveat is consistency: a small number can arrive a touch overlubed and feel slightly muted, so it’s worth buying a few extra switches than your board strictly needs and swapping out any duds.

Verdict

For a sub-quarter-per-switch linear, the Bubble 45g performs well for the money. It’s an easy recommendation for budget builds, first full-board lubing-free swaps, or anyone who wants a light, smooth, clacky linear without the tuning homework. Buy it if you want controlled clack and a soft, low-force keystroke; skip it if you’re chasing a deep, muted thock or want heavier, more deliberate linears.