When it's raining and wet outside, you can ride your bike inside!
For road bikes (designed for 130mm over-locknut-dimension), but can also be used on mountain bikes (steel nut will not screw on far enough to engage the nylok section of the nut but does engage sufficiently to be strong and secure). Weight: 100g.
Moruya Bicycles. ABN 27 559 728 517. 10 Ford St Moruya NSW 2537 Australia.