Scroll Wheel + Small Parts

Parts covered: scroll encoder, scroll wheel, middle click, side buttons, flex cables, onboard memory, USB-C, DPI button, LEDs, frame + screws.

1. The scroll wheel system

each notch of the wheel = one step counted by the encoder

• Encoder: counts each 'step' (notch) of the wheel and tells the mouse's chip which way you scrolled.
• Middle click: a small switch under the wheel - press the wheel down to click.

~ like: the ticks of an old radio dial - each tick = one step.

2. Encoder types

three ways an encoder counts wheel steps

• Mechanical: metal contacts. Cheap + replaceable, but this is the part that wears out + gets dusty.
• Optical: light counts the steps, nothing touches, so it's immune to contact wear. Found in many newer esports mice.
• Magnetic (Logitech MagSpeed): in the MX Master line - below a speed it clicks step by step; spin harder and a magnet releases it into free-spin (up to 1000 lines/sec claimed). No grinding part to wear out.

~ like: mechanical = a door latch that wears; optical = an automatic sensor door; magnetic = a fridge door held by a magnet.

!! Conflicting info: one source says the Logitech Superlight uses a TTC mechanical encoder, another says the Superlight 2 uses optical - could be different models, so ask the seller which encoder your exact model uses before you buy.

3. Encoder brands + feel

Kailh Red - lightest TTC Red - light TTC Gold - medium ALPS - heavy

(TTC Red's placement is rough - listed as low scrolling force)

• TTC, Alps, Kailh: build most mechanical encoders.
• Kailh Red: lightest + smoothest, rated 50 million.
• TTC Red: low scrolling force, rated 5 million.
• TTC Gold: medium - the in-between pick, rated 50 million.
• ALPS (Japan): heavier, well-defined steps. Reported as the loudest, but most stable + long-lived.

e.g. Razer Viper V2 Pro: 12mm Kailh encoder. Logitech G Pro X Superlight: 8mm TTC encoder.

e.g. Endgame Gear XM2 8k: TTC Silver encoder. XM2 8k v2: upgraded dustproof Kailh. WLMouse Strider: 'Dust Proof Silver' encoder.

• Encoder height: replacements must match the height (commonly 9-14mm) - measured from the base plate to the wheel holder.

~ like: tyre sizes - the right brand but wrong size won't fit your bike.

4. Scroll problems + fixes

dust in the slot is the most common cause of a jumpy wheel

• Symptoms: scroll skips, double-scrolls, or jumps the WRONG direction.
• Main causes: dust in the slot + a worn mechanical encoder (the most common reason wheels start jumping).

Fix it step by step:

1. Test - run an online scroll test.
2. Clean - use compressed air while scrolling.
3. Retest - still jumping?
4. Replace - fit a new encoder.

• Replacing an encoder = desolder a few pins + solder a matching TTC / Alps / Kailh one. One of the easier mouse repairs.

• Why it matters: in CS2 / Valorant, a weapon switch on the wheel + one phantom reverse step can mean your knife comes out mid-clutch.

~ like: a ceiling fan collecting dust until it starts wobbling.

5. Scroll features

• Free-spin: wheel spins freely for long pages.e.g. Logitech G502 X: hyper-fast free spin + ratchet mode.
• Tilt: push the wheel left / right for 2 extra buttons.e.g. Logitech G502 X tilt, Razer Basilisk HyperScroll Tilt Wheel.
• Defined steps: clear notches you can count - best for weapon switching.e.g. Ninjutso HyperScroll: marketed for defined steps that stay consistent. Logitech Superstrike: tighter wheel than before (fewer accidental weapon switches).

6. Side buttons + extra buttons

check the side buttons the way you'd check any other switch

• Normal gaming mice: 2 side buttons (forward + back).
• MMO mice: lots of side buttons for skills + macros (Razer Naga / Logitech G600 style) - heavier + bigger.
• Accidental presses: ultralight + fingertip-grip mice can have side buttons you hit by mistake.
• Side button switches: often on their own small PCB, linked with a flex cable.e.g. WLMouse Beast X: OM Blue Dots switches for side buttons.

~ like: the volume buttons on a phone - great when placed right, annoying when you press them by mistake.

7. Software + onboard memory

G HUB → Logitech

Synapse → Razer

iCUE → Corsair

SteelSeries GG → SteelSeries

CORE → Glorious

• Brand apps: install on your PC to change DPI, polling, buttons, lighting.
• Web driver trend: configure in the browser - no install needed.e.g. Zowie EC1-DW web driver, ASUS ROG Gear Link, Keychron Launcher web app.
• Onboard memory: saves DPI + settings inside the mouse, so you can take it to a friend's PC / a LAN and the settings stay.

~ like: contacts saved on your SIM card vs only inside one phone app.

8. The other small parts

• Flex cables: thin ribbon wires linking side / top boards to the main PCB. Like nerves.
• DPI button: top or bottom. Bottom = no accidental presses mid-game.e.g. Endgame Gear OP1 8k: CPI button on the bottom.
• USB-C port: for charging / wired use. Check whether you can play while it's charging.
• LEDs / RGB: status light or decoration - adds weight + battery use.e.g. Logitech G502 LIGHTSYNC RGB. Many ultralight mice skip RGB.

Frame + screws (the skeleton):

a frame inside the shell keeps an ultralight mouse stiff

e.g. G-Wolves Warg / VUK Medium: carbon rod reinforcement. Ninjutso Sora V3: endoskeleton at 40g.

~ like: a tent - thin fabric (shell) + strong poles inside (frame).

9. Scroll + Small Parts Dictionary

• Encoder: from 'encode' - turns movement into a signal the mouse's chip understands.
• Detent / notch: each little 'click' step you feel while scrolling.
• Steps per rotation: how many notches in one full wheel turn.
• Free-spin: wheel spins without notches.
• MagSpeed: Logitech's magnetic scroll wheel (MAGnet + SPEED).
• Ratchet: the part that makes notches - like a bike's freewheel click.
• Tilt wheel: wheel you can push sideways for extra buttons.
• Encoder height: size of the encoder (9-14mm) - must match to replace.
• Dustproof encoder: sealed design that keeps dirt out longer.
• MMO mouse: Massively Multiplayer Online games mouse - lots of side buttons.
• Web driver: mouse settings page that runs in a browser.
• Onboard memory: storage inside the mouse for your settings.
• Flex cable: flexible ribbon wire between boards.
• Endoskeleton: 'endo' = inside - a frame inside the shell (like our bones).

10. Test before you buy

1. Online scroll test: any skips or reverse steps?
2. Step feel: light / medium / heavy, clear notches?
3. Scroll noise: quiet or loud?
4. Wheel wobble side-to-side?
5. Middle click: too hard? does it scroll by accident while clicking?
6. Side buttons: reach, feel, accidental presses?
7. Software: app or web driver? does it save to onboard memory?
8. DPI button position + frame flex (squeeze test)?
9. Check again in the first 2-4 weeks (dust / wear)?

Remember!!

Encoder = counts wheel steps. Mechanical wears + gets dusty, optical + magnetic don't wear like that.

Feel: Kailh Red (light) -> TTC Gold (medium) -> ALPS (heavy). Jumping wheel = clean first, then replace.

Software: brand apps vs web drivers. Onboard memory = settings travel with the mouse.

Carbon rods / endoskeletons let ultralight shells stay stiff.