Metal Pedal Fatigue...
#1
Senior Member
Thread Starter
Join Date: Jan 2009
Location: Colorado Springs, CO
Posts: 5,968
Bikes: 2015 Charge Plug, 2007 Dahon Boardwalk, 1997 Nishiki Blazer, 1984 Nishiki International, 2006 Felt F65, 1989 Dahon Getaway V
Mentioned: 54 Post(s)
Tagged: 0 Thread(s)
Quoted: 1362 Post(s)
Liked 1,674 Times
in
827 Posts
Metal Pedal Fatigue...
I commute daily with toe clips/mouse traps. My 2015 Charge Plug came with this type of metal platform pedal (but NOT this brand):
Five years of near daily commutes and weekend rides and this happened:
The metal at the rear broke off. (I had removed the toe clip before the photo). The metal perimeter around the left pedal was cracked and on its way to breaking, too.
I checked the screws that held the metal "perimeter" to the main "H" portion on both pedals, and they were all snug.
I replaced 'em with a similar type and all's well for now.
My other two bikes are much older, a 1997 Nishiki, and a 1984 Nishiki, and I never had any pedal issues on them, although the metal around the hole for the crank bolt on the left crank arm on the '84 Nishiki started to break after 33 years, and I replaced it.
Five years of near daily commutes and weekend rides and this happened:
The metal at the rear broke off. (I had removed the toe clip before the photo). The metal perimeter around the left pedal was cracked and on its way to breaking, too.
I checked the screws that held the metal "perimeter" to the main "H" portion on both pedals, and they were all snug.
I replaced 'em with a similar type and all's well for now.
My other two bikes are much older, a 1997 Nishiki, and a 1984 Nishiki, and I never had any pedal issues on them, although the metal around the hole for the crank bolt on the left crank arm on the '84 Nishiki started to break after 33 years, and I replaced it.
#2
Old fart
Join Date: Nov 2004
Location: Appleton WI
Posts: 24,776
Bikes: Several, mostly not name brands.
Mentioned: 153 Post(s)
Tagged: 0 Thread(s)
Quoted: 3582 Post(s)
Liked 3,394 Times
in
1,928 Posts
Do the pedals on your older Nishikis use steel rather than aluminum for the broken pieces?
#3
Junior Member
without inspecting the fracture(s), hard to say if the pedal had a manufacturing defect of some sort that initiated / accelerated the failure. Stamped and bent aluminum in an inexpensive consumer product like a bicycle pedal likely doesn't get intense scrutiny for small fractures. I'd guess the failure began with the pedal cage "teeth" and maybe advanced to failure by a strike against a rock, curb or something similar.
Better to fail like it did than have a pedal axle break, which, while not super common, is not rare. .
Better to fail like it did than have a pedal axle break, which, while not super common, is not rare. .
Likes For downhillmaster:
#5
Lopsided biped
Join Date: Nov 2017
Location: NE Ohio
Posts: 737
Bikes: 2017 Day 6 Cyclone (the Buick); 2015 Simcoe Deluxe (the Xebec); Street Strider 3i (the not-a-bike); GreenSpeed Anura (the Black Swan)
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 316 Post(s)
Liked 160 Times
in
97 Posts
That's a casting. Get a tiny crack in it and it has no grain structure to resist further spreading of the crack. Failure is sudden.
Likes For rollagain:
#6
SE Wis
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 10,493
Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 2740 Post(s)
Liked 3,385 Times
in
2,048 Posts
I can't tell you how many pedals we rode on just the spindles as kids.
Likes For dedhed:
#7
Senior Member
#8
Señor Member
Join Date: Feb 2013
Posts: 5,066
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 649 Post(s)
Liked 292 Times
in
215 Posts
The pedals are often the cheapest part that comes on new bikes. People look for sealed bearing hubs and to what SHimano group the derailleurs belong, but ignore that the pedals are plastic and have bearing that feel like they are lubricated with sand. It makes less difference for many recreational cyclists, who will take off the stock pedals before the bike is ridden, but if you buy a bike today intending to ride to work tomorrow for the first time, you may be taking a chance with some dangerously poor quality pedals.
#9
rebmeM roineS
Join Date: Jan 2006
Location: Metro Indy, IN
Posts: 16,216
Bikes: Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 653 Post(s)
Liked 347 Times
in
226 Posts
Those are cage pedals - a section of the cage (the metal perimeter) broke.
Mouse traps?
Five years of commuting and weekend use is not bad. But usually bearing go bad before structural parts.
Mouse traps?
Five years of commuting and weekend use is not bad. But usually bearing go bad before structural parts.
__________________
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
#10
Senior Member
Thread Starter
Join Date: Jan 2009
Location: Colorado Springs, CO
Posts: 5,968
Bikes: 2015 Charge Plug, 2007 Dahon Boardwalk, 1997 Nishiki Blazer, 1984 Nishiki International, 2006 Felt F65, 1989 Dahon Getaway V
Mentioned: 54 Post(s)
Tagged: 0 Thread(s)
Quoted: 1362 Post(s)
Liked 1,674 Times
in
827 Posts