Why not use WD-40?

[Batbike]

I know NOT to use WD-40 on my bike but don't know why. Can someone tell me? Thanks!

[makbike]

Watch this.

http://bicycletutor.com/no-wd40-bike-chain/

It removes the existing lubricants which increases the friction between the chain and the chainrings/cassette.

[Eden]

I've also heard that it tends to attract and hold onto more grit?

[cattygrrl]

Ain't WD-40 mostly mineral spirits? That's a solvent, not a lubricant.

Not in my chains...

[roadfix]

I use it to degrease my drivetrain.

[OakLeaf]

I don't use it on the b/c at all.

It's most excellent for degreasing a m/c drivetrain and removing all that gunky built-up chain lube on the inside of the sprocket cover and the swingarm. And cleaning up small parts, like cleaning grease off bushings, spacers, etc. during maintenance. W-D and Scotch-Brite are great for cleaning threadlocker off fastener threads, cleaning dead gasket gunk off engine mating surfaces, etc.

Also for removing road tar from the body work (m/c and cage).

Spraying on exposed metal on the m/c (pump sprayer, and being careful to avoid brakes and tires of course) before extended storage as a corrosion preventative.

But not on the bicycle