In our Tech Q&A series, we tackle cycling queries – big or small, complex or simple – with insights from the BikeRadar team and trusted industry experts. Next up, a reader wants to know how they can clean and lubricate their drivetrain without contaminating their rotor.
Is there a practical way to clean and lubricate the drivetrain on my disc-brake equipped bike without having to remove the back wheel, to avoid contaminating the rear rotor?
A reader, via email
Absolutely, but it requires you to take care.
Simon von Bromley points out that one solution is to simply wax your chain rather than using off-the-shelf lubes, because this cuts out the need for cleaning and re-lubing. But that’s not the question we’ve been asked.
Digital editor Jack Luke explains there are covers you can buy for brake rotors (from Muc-Off, for example) or, if you want to save some cash, you can tie a plastic bag over the disc – or use a piece of cardboard to shield it.
However, these aren’t strictly necessary. Instead, you simply need to take care not to overspray any aerosols on the rotor.
When applying degreaser, either use a brush or spray it downwards so it doesn’t find its way into the brake caliper or onto the disc.
Using a foaming chain cleaner (for example, Fenwicks) will also reduce the risk of contamination, because the foam settles directly onto the chain and cassette.
It’s a similar situation when applying lube.
Make sure to hold the bottle close to the chain links and squeeze drips of lubricant onto the rollers as you turn the cranks backwards.
You can then use a rag to wipe off any excess.
