View Poll Results: What should I do?
Repair crank with current L pedal (So both pedals Left)
1
4.00%
Repair crank with new pedals (R + L)
4
16.00%
New crank with new pedals (R + L)
20
80.00%
Voters: 25. You may not vote on this poll
New pedals stripped crank
11-06-21, 07:13 AM
#51
cowboy, steel horse, etc
Join Date: Sep 2008
Location: The hot spot.
Posts: 44,784
Bikes: everywhere
Mentioned: 71 Post(s)
Tagged: 1 Thread(s)
Quoted: 12736 Post(s)
Liked 7,647 Times
in
4,055 Posts
I'd look for replacement cranks, check the crank arm for part number and length. Hard to tell on my phone, but they could be FC-5502.
eBay prices range from $40 for worn out to $200 for NOS.
You might even be able to find a lone right side.
There's no option for buy replacement crank, check pedal threads, reuse pedal if threads check out, so I didn't vote.
Also, you'll need to clean the pedal threads if the pedal was cross threaded. A small wire brush is nice, but a scratch awl and a toothbrush can be used to clean all the aluminum crank material out of the pedal threads.
Last edited by LesterOfPuppets; 11-06-21 at 07:18 AM.
11-06-21, 09:00 AM
#52
Senior Member
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,767
Bikes: lots
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 1958 Post(s)
Liked 2,932 Times
in
1,489 Posts
Likes For cxwrench:
Relax, dude. Literally everyone is saying the same thing. You’d make a work place awkward as hell. Don’t take life too seriously.
11-06-21, 11:07 AM
#54
Friendship is Magic
Join Date: Nov 2010
Location: Sacramento, CA
Posts: 22,984
Bikes: old ones
Mentioned: 304 Post(s)
Tagged: 0 Thread(s)
Quoted: 26382 Post(s)
Liked 10,361 Times
in
7,196 Posts
...it's not a problem when I do it.
But I have done it a lot, and I own a small framing square. The magical tool they sell along with the threadserts (both left and right), is a marvel of modern machining.
It consists of a tapered reamer, which transitions at the top to the tapping threads for the hole, so that the threadsert screws right in.
If you don't try to do it without removing the crank arm from the bike, there's a pretty good chance that the taper of the reamer will run it straight before you get to the threads at the top of it.
I guess it's probably easier to get a helicoil in there crooked, because you have to drill the hole larger to install it. But it's remarkably difficult to obtain those helicoils in the size and threading you need for both right and left pedals these days. There was someone making and selling a kit out of Taiwan a couple of years ago, but I'm not sure it's still available.
The RH ones are the same size and threading as an older spark plug standard, but even those have gotten scarcer. The threadserts just keep on coming, probably because they charge like 8 buck apiece for them, and it's just a tiny piece of sheet metal, intricately formed by industrial magic.
Likes For 3alarmer:
11-06-21, 04:12 PM
#55
Senior Member
I've seen this more than a few times, so you're not alone in this mistake op, though perhaps try to learn not to force things. If the crank is solid (not hollow) aluminum a helicoil can be installed- its not hard to do really, though the coils are surprisingly pricy (~$20). If you walked into my work we'd get it out the door same day, because apparently whoever was ordering before I got here ordered a ton of helicoils for some reason.
Likes For cpach:
11-06-21, 04:56 PM
#56
Senior Member
Join Date: Sep 2004
Location: Chicago area
Posts: 2,546
Bikes: Airborne "Carpe Diem", Motobecane "Mirage", Trek 6000, Strida 2, Dahon "Helios XL", Dahon "Mu XL", Tern "Verge S11i"
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 980 Post(s)
Liked 580 Times
in
398 Posts
The use of left-hand threads on the left-side pedal was popularized by the Wright Brothers (see the last paragraph under "Upgrades").
11-08-21, 12:09 PM
#57
Old Newbie
Join Date: May 2021
Location: North East Wales
Posts: 8
Bikes: Many, I'll list later
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 6 Times
in
3 Posts
hi, wondering if someone could advise..
I recently bought 2 new pedals for my pinarello bike. They arrived as both left pairs, i didn't realise this until cycling and the r pedal kept unscrewing itself and falling off.
I then tried to replace my old pedal, but this didn't fit in the crank, so i think the crank has been stripped.
I'm not really sure how to proceed, i would guess my options are the following:
1) repair crank with current l pedal (so both pedals left)
2) repair crank with new pedals (r + l)
3) new crank with new pedals (r + l)
any advice appreciated!
Travis
I recently bought 2 new pedals for my pinarello bike. They arrived as both left pairs, i didn't realise this until cycling and the r pedal kept unscrewing itself and falling off.
I then tried to replace my old pedal, but this didn't fit in the crank, so i think the crank has been stripped.
I'm not really sure how to proceed, i would guess my options are the following:
1) repair crank with current l pedal (so both pedals left)
2) repair crank with new pedals (r + l)
3) new crank with new pedals (r + l)
any advice appreciated!
Travis
11-10-21, 09:48 AM
#58
Senior Member
Join Date: Dec 2005
Location: Boulder, Colorado
Posts: 1,383
Bikes: Cinelli Supercoursa 69, Ritchey Breakaway Cross, Mondonico Diamond Extra 05, Coors Light Greg Lemond (built by Scapin) 88, Scapin MTB, Stumpjumper 83, Specialized Stumpjumper M4, Lemond Poprad 2001
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Liked 2 Times
in
1 Post
There was a kit I purchased from the local hardware to effect a repair. You can tap out the improperly installed pedal one size larger and add a special ring (helicooil) into the crank. I have had to do this myself and after years its holding. I wouldn't recommend doing this but would have a very experienced mechanic perform the job. And for god's sake dump the improper pedals in the round file and buy NEW ones so if they come in wrong you can return them to the seller.
Last edited by Deanster04; 11-10-21 at 11:05 AM.
11-16-21, 08:51 AM
#59
Junior Member
Thread Starter
Join Date: Nov 2021
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Liked 0 Times
in
0 Posts
I’m seeing a lot of pretentious comments. Like we haven’t seen this happen a million times in bike shops from people trying to install pedals themselves. Don’t read the negative comments. Happens all the damn time.
If there’s enough meat, a bike shop can tap and clean. You may have lost a couple threads but it’s better than none.
Someone mentioned heli coil which is the go to if there’s no meat left at all. Most bike shops should have these but I remember when we couldn’t get our hands on them for months for some reason.
I see it’s a an old 105 crank. These guys go for cheap. If a bike shop isn’t too big of jerks, square taper cranks can be slapped on and off within thirty minutes(if they’re not busy…) Maybe take a look around on Ebay if everything else is too troublesome.
Again, ignore the “you’re stupid” comments. Happens all the time.
By the looks of the poll, it’s time for some new cranks. Usually the case.
If there’s enough meat, a bike shop can tap and clean. You may have lost a couple threads but it’s better than none.
Someone mentioned heli coil which is the go to if there’s no meat left at all. Most bike shops should have these but I remember when we couldn’t get our hands on them for months for some reason.
I see it’s a an old 105 crank. These guys go for cheap. If a bike shop isn’t too big of jerks, square taper cranks can be slapped on and off within thirty minutes(if they’re not busy…) Maybe take a look around on Ebay if everything else is too troublesome.
Again, ignore the “you’re stupid” comments. Happens all the time.
By the looks of the poll, it’s time for some new cranks. Usually the case.
I haven't yet done anything about the repairs but it looks like it will need both a new crank and pedals.
I've enjoyed seeing people get so riled up about my bike drama, somewhat amusing.
11-18-21, 03:18 PM
#60
Banned
Option #3 is the best choice. If you cannot threat the pedal in by hand then something is wrong and not a good idea to muscle it through. This applies to pretty much everything.
Looking at the pedals the threads should have been opposite each other when viewed with the threads at the top with the threads looking like they are tilted to the right for the Left pedal which is a counter clockwise attachment.
Looking at the pedals the threads should have been opposite each other when viewed with the threads at the top with the threads looking like they are tilted to the right for the Left pedal which is a counter clockwise attachment.
11-19-21, 10:22 AM
#61
Senior Member
Join Date: Jul 2014
Location: socal
Posts: 4,252
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 878 Post(s)
Liked 812 Times
in
613 Posts
Don't know whether anyone mentioned this, but I chewed up about half the threads on a left crank e-MTB by having the pedal unscrew while I was riding and not noticing it until it was "too late". First time it happened in 40+ years of riding including my kids and wife's bikes, but things happen. Used red LockTite and gently installed the pedal, let cure and has been fine. Since, probably, you're going to replace, you have nothing to lose. If the red didn't work, I was thinking of "JB".
