Cleaning a gunked-up chain
Okay. We talked about why over-lubing is worse than under-lubing here, especially with how much dust we get on the Murdock trail or really any gravel around the valley. Now let's actually get the chain clean, because you can't lube a dirty chain and expect anything good to happen. You're just making paste.
Here's the thing... a gunked-up chain isn't really dirty, it's oily and dusty at the same time, and those two things together turn into this black grinding grit that wears out your chain, your cassette, and your chainrings all at once. If you've ever heard a bike coming from across the driveway, that's usually this. It's low key one of the most common problems I see and one of the easiest to fix at home.
What you need
Nothing fancy.
- A rag. Actually, three or four rags, or paper towels. You'll go through them.
- A degreaser. Bike-specific is nice but honestly dish soap and water works fine for most home setups. If you've got a citrus degreaser from the hardware store, that's great too.
- An old toothbrush, or a dedicated chain brush if you want to spend the eight bucks.
- Chain lube for after. Not WD-40. WD-40 is a cleaner, not a lubricant, people mix those up constantly.
- A bucket or a bin lid, something to catch drips, because this gets messy and it's black grease, it does not come out of concrete easy.
The actual steps
1. Shift to a middle gear and get the wheel off the ground. Flip the bike over onto the seat and handlebars, or use a stand if you've got one. You want the pedals able to spin freely.
2. Backpedal through a rag first. Just hold a rag loosely around the chain and backpedal a few rotations. This gets the big loose gunk off before you even bring out chemicals. You'll be surprised how much comes off right here.
3. Apply degreaser and work it in with the brush. Get into the links, not just the outside of the chain. That's low key the part people skip, they wipe the surface and call it done, but the grit lives down in the rollers and pins.
4. Backpedal through a clean rag again. Repeat until the rag's coming away close to clean. It won't be perfect. That's fine.
5. Let it dry. Give it a few minutes, especially if you used a wet degreaser. Our air's dry out here so this goes fast, ten minutes and you're usually good.
6. Lube it. Sparingly. One drop per link, backpedal to work it in, then wipe the outside of the chain down hard with a clean rag like it owes you money. That last wipe matters more than the lube itself, almost. You want the lube in the rollers, not sitting on the outside collecting dust.
That'll get you most of the way there.
A caution
Keep degreaser off your brake pads and rotors if you're on disc brakes. It's a two-second thing to drape a rag over the caliper while you work on the chain, and it saves you from a squealing, non-braking bike later that you can't figure out the cause of. I've chased that exact mystery before. It's always the degreaser.
Also, don't put your fingers between the chain and the chainring while you're backpedaling. Feels obvious until you're distracted mid-conversation and it happens anyway.
The Jennifer thing
I tried to walk Jennifer through this exact process once, before a group ride, degreaser and rag and everything. Got about halfway through explaining the toothbrush step and my brain wandered off to whether we needed to push the ride start time back twenty minutes. Just left her standing there mid-sentence. She finished the whole job herself, chain looked great, and I apologized after because I realized I'd wandered off without even noticing.
So if I do that to you in class, say something. I mean it. I know I do it and I'd rather you call me on it than sit there wondering if I'm coming back to the thought.
The upside of that story, if there is one, is that she didn't need me to finish explaining. Most of this stuff is pretty forgiving once you've done it once. You clean it, you lube it light, you wipe it down. Nobody needs a shop for this part.
Before next time: if your chain's making noise or looks black and pasty, give it this treatment before class. We'll build on a clean chain next, and starting gunked-up just means we're doing this step twice.