Seen the rock riders for 35 quid.
Is there a milk bottle fender type solution instead?

http://www.wickes.co.uk/Wickes-Economy-Pipe-Insulation-28mm-x-13mm-x-2m/p/137658

?

old tyre

As above, a bit of old tyre and some cable ties.

I used some thick smooth rubber that was the sprung base of a wooden sofa. About 5 mm thick. Cut and shaped to fit frame, it looks a lot neater than the bit of old tyre.

If you have an ugly bike, a homemade bodge is fine. If it’s aesthetically pleasing, buy a Rockguard.

FTFY

If you have a bike, a tyre is fine.

For added pimping, make it match the ones on the bike.

https://www.tritoncycles.co.uk/frames-forks-c6/frame-fork-spares-c152/trek-remedy-ex-lush-carbon-2012-downtube-armour-p12602

https://www.tritoncycles.co.uk/frames-forks-c6/frame-fork-spares-c152/session-2011-downtube-armor-p17839

https://www.tritoncycles.co.uk/frames-forks-c6/frame-fork-spares-c152/remedy-29-2014-carbon-armour-kit-p12605

I couldnt buy one for my Radon Swoop, so made my own out of 2mm KYDEX & 3M double sided tape. £6 an A4 sheet, 1/2 needed

Could have made the edges prettier, but just cut with snips, heated it and rode off into the sunset

Old crudcatcher here – ziptied on

😳