"...who cares" <[email hidden]> wrote in message
"]news:[email hidden]...
Quoted message said:I ride what I like to think of as the ultimate audax bike. It cost a lot
of
Quoted message said:money and time to make a darn light bike with a rack & mudguards. The problem is my lock and chain
weighs a bloody ton!!! Thereby negating any weight reduction I've previously made.
So help me out here, I need the lightest yet secure lock known to man. A 50cm circumference would
do the job and it needs to be secure for up to 15mins at a time outside shops, library, etc.
Years ago, I drew up plans for just such a lock. It was to be a "spider" design (it looks like a
spider), with wide, flat arms made from flexible strands of Kevlar inside a thin radially-belted
casing of Kevlar, covered in a tough polymer housing. The arms would all connect to a central
composite-encased lock mechanism (internal to the "spider" shape).
The flat composite arms would be too fat for bolt cutters (by design), and almost impossible to saw
through, since the fine strands of Kevlar would get stuck in the saw teeth. I figured it would
probably take quite a long time to break this kind of lock, thus adding a significant deterrent.
You'd probably need a sharp chisel, and several minutes of loud pounding with a sledge hammer
against a steel anvil to cut this lock.
The "spider" design would self-coil around any frame tube with enough holding force to prevent it
from sliding around; but would still allow easy manipulation for locking up the bike. Composite
construction would keep the weight to a minimum. The only steel component would be the lock core.
I still have the plans around here somewhere if any well-heeled entrepreneur wants to give it a go.
There's a decent sized market for such a device, I suspect. I haven't seen anything nearly so
innovative as this design; but that doesn't mean there isn't one :-)
-Barry