Another advantage of disc brakes
06-29-19, 07:27 PM
#26
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06-30-19, 07:40 AM
#27
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How do you think they'd bend..?
You've got a shackle cross-passed through the disc. The disc is carrying the shackle up to the caliper, which has a circa 4mm gap.
The transfer of shapes is literally the same as a dog carrying a 6ft stick in it's mouth and attempting to run through a very narrow doorway... no twist, no leverage, just pure T-bone straight into a bridged lockout situation.
The only physical ways of failure i can see are:
1) disc cuts through the shackle like bolt cutters through a cable lock.
2) disc shatters like glass.
3) force of shackle being pile-driven into caliper tears the caliper off it's mount.
Also to consider; impact is very slow compared to brakes actually being used, or stones hitting disc at speed. Leverage is minimal, especially with bigger discs.
You've got a shackle cross-passed through the disc. The disc is carrying the shackle up to the caliper, which has a circa 4mm gap.
The transfer of shapes is literally the same as a dog carrying a 6ft stick in it's mouth and attempting to run through a very narrow doorway... no twist, no leverage, just pure T-bone straight into a bridged lockout situation.
The only physical ways of failure i can see are:
1) disc cuts through the shackle like bolt cutters through a cable lock.
2) disc shatters like glass.
3) force of shackle being pile-driven into caliper tears the caliper off it's mount.
Also to consider; impact is very slow compared to brakes actually being used, or stones hitting disc at speed. Leverage is minimal, especially with bigger discs.
Speed is slow, but leverage is actually pretty high.
07-03-19, 10:21 AM
#28
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^ Absolutely. I have spent enough time truing rotors that haven't been mangled, but aren't straight enough. It doesn't take much force to bend the thin rotors on bicycles. Anyone who would suggest this locking method lacks a practical understanding of where it will ultimately lead. No thank you.
Dumb idea.
Dumb idea.
07-03-19, 07:05 PM
#29
Cycleway town
How about I carry on doing what I do, and others do what they like, based on the varying info and opinions offered by various people, and their own view?
07-03-19, 07:25 PM
#30
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Question for the OP - how much does the act of forcing the padlocked disc cost the user when the thief learns he has been foiled? And can you ride the bike home after the thief has had his way?
Ben
Ben
07-03-19, 11:45 PM
#31
Junior Member
A padlock can be broken very easily with two wrenches. Insert the open ends of the wrenches into the lock and push the wrenches together … and snap. I did to the lock on my shed last summer after losing the key. It was a pretty expensive Master Lock.
07-04-19, 05:36 AM
#32
Cycleway town
Yeah, but the wrenches need to be the correct size for the padlock, and i don't think this is gonna be an issue for a 2-min shop stop.
I really think there's a market for ultralight locks. Leave your two-barrel 25mm-wire D-lock at the rack where you park all day, and have a mini alloy one for carrying - as the rest of the time you're only gonna stop somewhere to grab a drink.
I really think there's a market for ultralight locks. Leave your two-barrel 25mm-wire D-lock at the rack where you park all day, and have a mini alloy one for carrying - as the rest of the time you're only gonna stop somewhere to grab a drink.
07-04-19, 05:56 AM
#33
Cycleway town
Dunno how much use this'd be on a bicycle, depends really, would work on mine for a few minutes.
And it appears aluminium D-locks are available (there were other colours than pink). Nobody's gonna attack this with anything less than bolt croppers or an angle grinder, yet.. 270g.
And it appears aluminium D-locks are available (there were other colours than pink). Nobody's gonna attack this with anything less than bolt croppers or an angle grinder, yet.. 270g.
07-04-19, 02:57 PM
#34
Senior Member
Yeah, I'd want to see some attacks on the alu bodied ones before I pass judgement.
07-04-19, 03:21 PM
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From experience, the rider generally won't have enough speed to break anything. Instead, there will have been just enough time to position the feet for riding when the motorcycle comes to a sudden stop. There is then frantic effort to not topple over, all while trying to look cool.
