Crankset confusion
02-10-09, 02:31 PM
#1
Senior Member
Thread Starter
Join Date: Sep 2008
Location: Michigan
Posts: 193
Bikes: Raleigh Sports, Giant Cadex, Waterford X-11, Specialized Rockhopper Comp FS, Viscount Aerospace Pro, Scwinn Passage
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Crankset confusion
I've recently discovered my drive-side crank arm has a stress fracture. I replaced the left arm for the same reason a few months ago. So, I'll be needing a new crankset.
I was browsing ebay, and came across this:
https://cgi.ebay.com/ws/eBayISAPI.dll...m=220358073864
He says a square taper bb is required, but it appears to be octalink. What's up with that?
Also I have 7 speed, the seller says it works with 8 or 9 speed. Could I make this work?
You should know that My prior crankset was shimano 105. I don't know the BCD, but I'm assuming 130. I also don't know what the bb size is.
thanks
I was browsing ebay, and came across this:
https://cgi.ebay.com/ws/eBayISAPI.dll...m=220358073864
He says a square taper bb is required, but it appears to be octalink. What's up with that?
Also I have 7 speed, the seller says it works with 8 or 9 speed. Could I make this work?
You should know that My prior crankset was shimano 105. I don't know the BCD, but I'm assuming 130. I also don't know what the bb size is.
thanks
02-10-09, 02:39 PM
#3
Senior Member
Join Date: Oct 2006
Location: Puyallup Washington
Posts: 1,846
Bikes: Motobecane Mirage fixed gear, Nashbar Alpha Road 5000, Bianchi Grizzly, Coppi Fiorelli, , Schwinn Trike, , GT All Terra, Old Peugeot, Nishiki 3 speed, Bugatti, Cannondale Black Lightning, Dura All, Bianchi Touring, Bridgestone T700 & more
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 3 Times
in
2 Posts
I'm pretty darn sure those are indeed square taper....You need to measure the spindle on your current cranks to see if the length is compatible. Those cranks listed should work just fine with 7 speed.
02-10-09, 02:42 PM
#4
Senior Member
Thread Starter
Join Date: Sep 2008
Location: Michigan
Posts: 193
Bikes: Raleigh Sports, Giant Cadex, Waterford X-11, Specialized Rockhopper Comp FS, Viscount Aerospace Pro, Scwinn Passage
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Cool, will the chainrings just be a bit thinner?
02-10-09, 03:26 PM
#5
Senior Member
Most likely square taper, 130 BCD.
The allen bolts screw into the end of the bottom bracket. If you have the type requiring nuts just save your nuts from the old crankset and reuse.
To measure your BCD, look here: https://sheldonbrown.com/gloss_bo-z.html#bcd
The allen bolts screw into the end of the bottom bracket. If you have the type requiring nuts just save your nuts from the old crankset and reuse.
To measure your BCD, look here: https://sheldonbrown.com/gloss_bo-z.html#bcd
02-10-09, 04:48 PM
#6
Senior Member
Join Date: Oct 2008
Posts: 2,929
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Your crank arms should NOT develop stress cracks. If they do, it is certainly a design or (more likely) manufacturing defect. Contact Shimano for a replacement.
02-10-09, 06:17 PM
#10
feros ferio
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Posts: 21,793
Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
Mentioned: 44 Post(s)
Tagged: 0 Thread(s)
Quoted: 1390 Post(s)
Liked 1,322 Times
in
835 Posts
If you are getting cracks at the spindle eyes, your spindle may be too large for your cranks. In the 1970s Shimano used a larger taper (same angle, just larger cut-off end) than everyone else, but many others eventually adopted Shimano's dimensions.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
02-10-09, 06:50 PM
#11
cycles per second
Join Date: Oct 2003
Location: Minnesota
Posts: 1,930
Bikes: Early 1980's Ishiwata 022 steel sport/touring, 1986 Vitus 979, 1988 DiamondBack Apex, 1997 Softride PowerWing 700, 2001 Trek OCLV 110
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 44 Post(s)
Liked 71 Times
in
48 Posts
That crank takes square taper BB. I have the same crank on my bike. The owner has replaced the 14mm hex crank bolts with 8mm allen bolts with built in dust cap, probably because the plastic snap-in dust caps get all mangled when you try to remove them.
It will work fine with 7-speed. I don't think there's any difference in thickness. The 9-speed large ring is likely ramped and pinned.
IIRC, my bike has a 68x115 BB axle.
It will work fine with 7-speed. I don't think there's any difference in thickness. The 9-speed large ring is likely ramped and pinned.
IIRC, my bike has a 68x115 BB axle.
02-10-09, 07:08 PM
#12
Senior Member
Thread Starter
Join Date: Sep 2008
Location: Michigan
Posts: 193
Bikes: Raleigh Sports, Giant Cadex, Waterford X-11, Specialized Rockhopper Comp FS, Viscount Aerospace Pro, Scwinn Passage
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Well the paint/anodizing whatever is chipping off everywhere. Here's an incredibly *****y picture of the left crank arm taken by webcam.
it's cracked all of the way through.
it's cracked all of the way through.
02-10-09, 07:19 PM
#14
Senior Member
Thread Starter
Join Date: Sep 2008
Location: Michigan
Posts: 193
Bikes: Raleigh Sports, Giant Cadex, Waterford X-11, Specialized Rockhopper Comp FS, Viscount Aerospace Pro, Scwinn Passage
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
02-10-09, 07:39 PM
#15
Buh'wah?!
Join Date: Jul 2008
Location: Charlottesville VA
Posts: 2,086
Bikes: 2014 Giant Trance
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Maybe something somehow got stuck in the space between the spindle and crankarm when it was installed and slowly caused a stress fracture which eventually broke. Or maybe a manufacturing defect. You're lucky it wasn't worse, it might have ended badly.
-Gene-
-Gene-
02-10-09, 08:05 PM
#16
Senior Member
Thread Starter
Join Date: Sep 2008
Location: Michigan
Posts: 193
Bikes: Raleigh Sports, Giant Cadex, Waterford X-11, Specialized Rockhopper Comp FS, Viscount Aerospace Pro, Scwinn Passage
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
I doubt they have old 105 cranksets stockpiled.
And
I'll never find a receipt for a bike my dad bought in the mid 90's.
hmm
02-10-09, 08:09 PM
#17
Disraeli Gears
More succinct: Vaffunculo. I want a bike with that on the downtube; can't decide whether it should be a French or an English one. Headbadge a photo of Beppe Grillo (Louison Bobet style) giving the V-sign.
Last edited by Charles Wahl; 02-10-09 at 08:13 PM.
02-10-09, 08:16 PM
#18
www.theheadbadge.com
Join Date: Sep 2005
Location: Southern Florida
Posts: 28,509
Bikes: https://www.theheadbadge.com
Mentioned: 124 Post(s)
Tagged: 0 Thread(s)
Quoted: 2420 Post(s)
Liked 4,381 Times
in
2,090 Posts
-Kurt
__________________
02-10-09, 09:44 PM
#20
Senior Member
Join Date: Oct 2006
Location: Puyallup Washington
Posts: 1,846
Bikes: Motobecane Mirage fixed gear, Nashbar Alpha Road 5000, Bianchi Grizzly, Coppi Fiorelli, , Schwinn Trike, , GT All Terra, Old Peugeot, Nishiki 3 speed, Bugatti, Cannondale Black Lightning, Dura All, Bianchi Touring, Bridgestone T700 & more
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 3 Times
in
2 Posts
I dunno......I could maybe see this happening if someone greased the BB spindle and was a ham fisted ultra super duper strong man and really cranked down the crankarm bolts...Maybe coupled with a vicious heat/cold cycle? Yunno dis-similar metals expanding/contracting at different rates? Weird.
02-10-09, 11:54 PM
#21
Senior Member
Thread Starter
Join Date: Sep 2008
Location: Michigan
Posts: 193
Bikes: Raleigh Sports, Giant Cadex, Waterford X-11, Specialized Rockhopper Comp FS, Viscount Aerospace Pro, Scwinn Passage
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
02-11-09, 06:29 PM
#22
Senior Member
Thread Starter
Join Date: Sep 2008
Location: Michigan
Posts: 193
Bikes: Raleigh Sports, Giant Cadex, Waterford X-11, Specialized Rockhopper Comp FS, Viscount Aerospace Pro, Scwinn Passage
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Here are some higher res photos.
Last edited by bbllaakke; 02-11-09 at 06:30 PM. Reason: Please excuse the rust chain.
02-11-09, 07:13 PM
#24
Senior Member
Thread Starter
Join Date: Sep 2008
Location: Michigan
Posts: 193
Bikes: Raleigh Sports, Giant Cadex, Waterford X-11, Specialized Rockhopper Comp FS, Viscount Aerospace Pro, Scwinn Passage
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
I think it has a few more rides left in it.
I'm sending a letter to Shimano saying I'm still riding on the drive-side crank. Hopefully they'll see the picture and send me a new crankset.
I'm sending a letter to Shimano saying I'm still riding on the drive-side crank. Hopefully they'll see the picture and send me a new crankset.
Last edited by bbllaakke; 02-11-09 at 07:18 PM.
02-11-09, 07:50 PM
#25
Senior Member
Join Date: Jun 2008
Location: Hamilton, Ontario, Canada
Posts: 265
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Interesting argument. Theoretically, since the crack (at least on the left crank) has gone all the way through without catastrophically failing it has released the stress in the crank and can't propagate any further. So yes, theoretically you could ride it although it probably wouldn't stay tight on the spindle....
PRACTICALLY, though, a big wedge could suddenly break out of it causing it to fall off the spindle, causing you to fall off the bike and break your neck.
So I hope you are kidding about riding it.
PRACTICALLY, though, a big wedge could suddenly break out of it causing it to fall off the spindle, causing you to fall off the bike and break your neck.
So I hope you are kidding about riding it.