Yeah, like Steve says, we wouldn’t want to be responsible for any accidents Depending on how much rust compared to metal there is you should just replace it…. and if you dont think you know how just ask a mate or a mechanic. The best way to cure something is to prevent it though and a little WD never hurt anyone!
I’d have to second the comments about a new chain. Realistically, they’re cheap as chips for these bikes – and I used to work with a lad whose chain failed and jammed up his back wheel. He was only doing 30 or so at the time and his leg’s fine now, but he still has scars from where the hospital screwed his shin back together.
If its surface rust – after getting a garage to check, get a wire brush to it and get it all scrubbed off.
After that you can buy chain lube which will help vastly. The trouble with WD40 is its not water repellent – so it will just wash off in the rain or through a puddle
Just adding my thoughts on this.. 1/ If the chain is that badly rusted it should never be used and replaced along with the sprockets (if worn) and secondly a little gear or light machinery or even chain saw oil ( which is quite cheap) is cheaper and certainly less painful than any bodily damage and a damaged bike … not to mention any mitigation by any third party’s involved !! :-0 … ride safe
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