The Infamous Dork Disc
#26
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We always called 'em "pie plates". Still use them on some bikes.
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Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
Richard C. Moeur, PE - Phoenix AZ, USA
https://www.richardcmoeur.com/bikestuf.html
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#27
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If you do bend your rear mech I think it's less likely to snag on a smooth bit of plastic than an unprotected spoke. Rear mech in spokes can have you walking home. I actually bought a plastic dork disc not long ago to fit on my hack bike because I tend to treat it careless, but I didn't check the hub flange diameter so it will be going on another bike that I've not started yet.
I think yes if it were to hit smooth plastic it is less likely to snag but I don't think generally it will hit much smooth plastic unless a disc wheel or something large and even then if it was able to bend to that level I have a feeling it would have just cracked the dang thing. maybe not but those things seem to be easy to snap off.
#28
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The largest rear sprocket is effectively a 28T - the four support arms for the integral "dork disk" replace 4 teeth, so it only has 24 actual teeth.
Edited to add: this is the only example I've ever seen; dunno if Shimano ever made a 6- or 7-speed version.. It's now awaiting a future build (which will be 6-speed; it takes standard Uniglide sprockets and spacers), which likely won't occur for several years in the future. The source purportedly had 2 of these, but the second turned out to be an actual Schwinn Approved 6-speed UG cassette w/o built in spoke protector on the last sprocket. I didn't really mind, as my NOS UG hub set is 6-speed.
Clever design, but likely added too much weight (2mm steel plate is fairly heavy) to catch on industry-wide. Plus, I'm also guessing either Shimano or Schwinn patented the design.
Last edited by Hondo6; 01-09-23 at 05:07 PM.
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That’s a bizarre looking cassette with the built in spoke protector. I have never seen such a thing. I’m not sure if the 4 missing teeth on the largest cog are a great idea, which results in a such a large gap between the two teeth.
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Of further note is the damage that comes from a slipped chain to the inner hub. If the rider keeps pedaling even a few turns the chain can do allot of damage to the spoke necks. In this picture I am trying to show that a jammed chain has caused small damage and abrasions to the most critical part of the spoke, the bend at the neck. I am now going to have to replace most of the spokes on this wheel.
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Last edited by zandoval; 01-09-23 at 06:31 PM.
#31
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However, I don't see why the missing teeth would be a major problem, other than maybe making the sprocket wear out a bit faster (fewer teeth engaging per rotation). I understand 1/2" pitch chain works acceptably on skip-tooth (e.g., 1" pitch) chainrings. All one missing tooth does is create a short a skip-tooth segment in 4 places on the sprocket.
Last edited by Hondo6; 01-09-23 at 06:40 PM. Reason: Minor rewording, add missing punctuation mark.
#32
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That stamped integrated version is cool. Can't imagine it goes well with shift ramps though.
Only scraping outies is why there are eight in my photo earlier. The innies were fine
Only scraping outies is why there are eight in my photo earlier. The innies were fine
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#33
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#34
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I assert that the entire internet is wrong.
While the spoke protector is probably marginally helpful in preventing catastrophe from an overshift, it's most useful function as far as I can tell is to shield the exposed bearings in the backside of the freewheel from debris intrusion.
The rest is cultural inertia, hopes, dreams & luck.
On bikes with freewheels, I recommend the dork disc be installed for maintenance reasons more so than any disaster mitigation concerns.
It might be an unpopular sentiment but, anyone who relies on a safety device for safety usually get what they deserve.
That being said: Shiny, metal dork disks get a pass.
While the spoke protector is probably marginally helpful in preventing catastrophe from an overshift, it's most useful function as far as I can tell is to shield the exposed bearings in the backside of the freewheel from debris intrusion.
The rest is cultural inertia, hopes, dreams & luck.
On bikes with freewheels, I recommend the dork disc be installed for maintenance reasons more so than any disaster mitigation concerns.
It might be an unpopular sentiment but, anyone who relies on a safety device for safety usually get what they deserve.
That being said: Shiny, metal dork disks get a pass.
#35
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My mid 2015 MacBook is too old for anything beyond Monterey. I suspect I could poke around in some Safari setting and see what is askew, but I rarely follow video links anyway.
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Back in the day: straight cut cog teeth, late shifting derailleurs that required overshift.
Now: shaped and ramped cog teeth, early shifting indexed derailleurs.
Now: shaped and ramped cog teeth, early shifting indexed derailleurs.
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Just to be wrong the guys test methodology is broken. He uses his treadmill to spin the wheels and then drops the chain with minimal torque on the cranks and, as a result, no realistic, short/long term tension in the chain. If he dropped it whilst pedaling with real world tension in the chain and his butt on the saddle he might, will, see different results.
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Judging by the chewed up spoke protectors I've seen they do a good job of protecting spokes on the cheap and neglected bikes that they were often fitted to. But many of those had cutouts rather than being full pie dish.
Last edited by grumpus; 01-11-23 at 12:31 PM. Reason: Messed up the quoting.
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I typically remove them but then most of the bike I have didn't come with any. The one that did blends in so I left it on.
P1000031 , on Flickr
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Next thing will be bashing brake safety levers.
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I think of spoke protectors (aka Dork Discs) as insurance. You don't really want if but if something does go wrong you're really glad you have it.
To me a spoke protector doesn't look any worse than a disc brake does.
Most of my bikes don't have a spoke protector.
Cheers
To me a spoke protector doesn't look any worse than a disc brake does.
Most of my bikes don't have a spoke protector.
Cheers
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