Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 26
  1. #1
    Newbie
    Join Date
    Apr 2014
    Posts
    2
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Bike pedal's threads damaged

    Hi everyone,

    I bought a new bike in November last year. Last month, the pedal came out. I tried to put it back in. But did it the wrong way and damaged the threads of the pedal and the other bit as well. I'm an idiot.

    Took it to this bike repair centre and the guy goes will have to replace the whole "chain set" which will cost me £90 with the parts and the labour. I bought the bike for £90 to start with.

    Is t possible to sort it out?

    Thanks a lot

  2. #2
    Senior Member Tim_Iowa's Avatar
    Join Date
    Jun 2013
    Location
    Cedar Rapids, IA
    My Bikes
    1997 Rivendell Road Standard (tourer), 1997 Giordana XL-Eco (gofast), 2006 Cannondale F400 (MTB), 1988 Schwinn Project KOM-10 (gravel grinder)
    Posts
    327
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    The "crank set" is what needs to be replaced. You damaged the threading on the crank arm, so it's no good. Crank sets start around $40 (what is that, £25?) and go up from there. So, plus the labor charge, you see why it's expensive.

    You can replace the existing crank with a different one yourself if you:
    A) get the correct crank. There are lots and lots of different cranks, so it's tough to match. Get all the specs from the repair centre before you leave.
    B) have the tools. You'll need hex wrenches, maybe socket wrenches, a torque wrench, and the proper crank puller tool.

    I don't know if they have bike co-ops or collectives in England. If they do, see if the kind folks there can help you do it yourself.

  3. #3
    Newbie
    Join Date
    Apr 2014
    Posts
    2
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Tim_Iowa View Post
    The "crank set" is what needs to be replaced. You damaged the threading on the crank arm, so it's no good. Crank sets start around $40 (what is that, £25?) and go up from there. So, plus the labor charge, you see why it's expensive.

    You can replace the existing crank with a different one yourself if you:
    A) get the correct crank. There are lots and lots of different cranks, so it's tough to match. Get all the specs from the repair centre before you leave.
    B) have the tools. You'll need hex wrenches, maybe socket wrenches, a torque wrench, and the proper crank puller tool.

    I don't know if they have bike co-ops or collectives in England. If they do, see if the kind folks there can help you do it yourself.
    Thanks for taking the time to write the long reply. Much appreciated.

  4. #4
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    12,518
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    If it's just the pedal eye threads that are damaged on the crank arm, a decent bike shop should be able to put a helicoil in to restore the threads, better than new.

  5. #5
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    40,134
    Mentioned
    28 Post(s)
    Tagged
    0 Thread(s)
    Took it to this bike repair centre and the guy goes will have to replace the whole "chain set" which will cost me £90 with the parts and the labour.
    I bought the bike for £90 to start with.

    China Vs UK .. If a cheap chainset, the labour and parts to repair the threads of the crankarm
    will quickly exceed just replacing the cranks itself.

    just buy a new bike then ,. try to not screw up the next one .


    At £90 that really undercuts Acidfast7's BSO single speed he says is such a bargain, by half or more..
    Last edited by fietsbob; 04-03-14 at 03:32 PM.

  6. #6
    Senior Member Jed19's Avatar
    Join Date
    Oct 2004
    Posts
    3,757
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I damaged a pedal thread on my mountain bike, stopped at the nearest bike shop, guy charged $40, and all has been good so far. He used an insert.
    Regards,

    Jed

  7. #7
    Senior Member koolerb's Avatar
    Join Date
    Oct 2012
    Location
    Upstate NY
    My Bikes
    Giant, Mongoose, Cannondale
    Posts
    718
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by JohnDThompson View Post
    If it's just the pedal eye threads that are damaged on the crank arm, a decent bike shop should be able to put a helicoil in to restore the threads, better than new.
    Or if you want to do it yourself heliciol kits are pretty inexpensive. They come with a drill bit, tap, and heliciols. Everything you need but the drill.

  8. #8
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    20,714
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by Tim_Iowa View Post
    The "crank set" is what needs to be replaced. You damaged the threading on the crank arm, so it's no good. Crank sets start around $40 (what is that, £25?) and go up from there. So, plus the labor charge, you see why it's expensive.

    ...
    I don't know if they have bike co-ops or collectives in England. If they do, see if the kind folks there can help you do it yourself.
    Chainset is UKish (Britspeak) for what we here call a crankset. Same item, different name.

    Based on the numbers, I suspect the shop quoted what I call a "go away" price. Many shops don't like working on bikes they consider beneath their dignity, or what some here call BSOs (bicycle shaped object). So they quote a price so high that you'll pass.

    You should be able to get a better price at a different bike shop, or possibly have someone save the crank with a thread insert coil. This part costs very little, so it's a pure labor job, but should be nearer to a quarter of what you were quoted. (not all shops do this, so ask a few.

    Otherwise the best bet might be a local bike co-op if there's one near you (here's a list) These shops specialize on trepair of bikes like yours at low prices which keeps them on the road. They may have a used crank, or likely be able to do a coil on yours at a fair price.

    So your next step is to wear out some shoe leather exploring the local options.

    Or, you can buy a crank via the internet, and install yourself. It's not that complicated, and there are plenty of tutorials.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  9. #9
    Senior Member
    Join Date
    Jun 2010
    Posts
    123
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    A few years ago a properly-installed pedal's threads failed and ruined the threads of the crank arm. Fortunately it was on the non-crank side. I bought a replacement arm for $10; it has worked since.

    If your pedal's threads were 1/2-inch maybe you could tap it out to 9/16-inch and use a 9/16-inch-thread pedal.

  10. #10
    Senior Member rydabent's Avatar
    Join Date
    Apr 2010
    Location
    Lincoln Ne
    My Bikes
    RANS Stratus TerraTrike Cruiser
    Posts
    3,834
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Take it to another bike shop and see if they cant chase the threads on the crank arm, and if that works. At the very most a good bike shop should be able to put a heli-coil in the crank arm to fix the threads. Then just buy a new set of pedals. Much cheaper than replacing the whole crank set.
    Last edited by rydabent; 04-04-14 at 07:06 AM.

  11. #11
    Senior Member Homebrew01's Avatar
    Join Date
    Jul 2004
    Location
    Ffld Cnty Connecticut
    My Bikes
    Old Steelies I made, Old Cannondales
    Posts
    15,502
    Mentioned
    6 Post(s)
    Tagged
    1 Thread(s)
    Which side of the chainset (crankset) is damaged ? The left side arm, or the right side arm that includes the chainrings ?

    I second the opinion of getting a second opinion
    Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike

  12. #12
    Senior Member
    Join Date
    Jul 2010
    Posts
    100
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm am preparing to put new pedals on my bike. Should I assume "righty, tighty. lefty, loosey"" probably doesn't apply for crankshafts?

  13. #13
    Senior Member Homebrew01's Avatar
    Join Date
    Jul 2004
    Location
    Ffld Cnty Connecticut
    My Bikes
    Old Steelies I made, Old Cannondales
    Posts
    15,502
    Mentioned
    6 Post(s)
    Tagged
    1 Thread(s)
    A bicycle doesn't have a crankshaft. A "crankset" or "Chainset" (Brit) have pedals attached to them and usually refers to both crank arms and chainrings. The bottom bracket is the axle assembly inside the frame that contains the ballbearings and cups the the crank arms connect to.

    The right hand pedal on the side with the chain is regular right hand thread. Put a dab of grease on the threads first.

    The other pedal on the left side is LEFT hand thread. so that one is lefty-tighty and right-loosey.

    They should thread in most of the way by hand. If it takes any force at the beginning, something is wrong and you risk damaging the threads and starting another thread like this one.
    Last edited by Homebrew01; 04-04-14 at 08:10 AM.
    Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike

  14. #14
    Senior Member JOHNinIL's Avatar
    Join Date
    Jan 2014
    Location
    Chicagoland
    My Bikes
    1997 Giant Rincon, no name SS, 70's Raleigh
    Posts
    56
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you don't care to much about reusing the pedal you could braze the pedal and crank arm together.
    Last edited by JOHNinIL; 04-04-14 at 06:59 PM.

  15. #15
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    20,714
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by chillspike View Post
    I'm am preparing to put new pedals on my bike. Should I assume "righty, tighty. lefty, loosey"" probably doesn't apply for crankshafts?
    Definitely not!!!!

    Right pedals have RH threads, and left pedals have left hand threads. Rather than remembering left from right, remember that turning the top toward the front tightens either, and back toward the back of the bike backs them out.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  16. #16
    Can'tre Member 3alarmer's Avatar
    Join Date
    Nov 2010
    Location
    ,location, location...
    My Bikes
    old ones
    Posts
    7,009
    Mentioned
    106 Post(s)
    Tagged
    3 Thread(s)
    ...my currency converter tells me you paid 150 American dollars for this bike.

    While it is certainly repairable, were I you and unable to do so myself (and I think this is the case),
    I would just write it off as a learning experience and get another bicycle.
    Quote Originally Posted by The Australian Book of Atheism
    There is only no god, and Cyclaholic is his prophet.

  17. #17
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    20,714
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by 3alarmer View Post
    ...my currency converter tells me you paid 150 American dollars for this bike.

    While it is certainly repairable, were I you and unable to do so myself (and I think this is the case),
    I would just write it off as a learning experience and get another bicycle.
    Mike,

    I'm sure the Bike Kitchen sees lots of comparable bikes with similar problems, and gets these people rolling with a coil at relatively small dollars. Of course, the fix or chuck decision turns on what else may be needed, and the cost of the alternatives.

    The OP needs to do an assessment of what he's willing to pay to fix this, and needs to be very cold blooded about it. He needs to be sure that he's covering all the bases so he doesn't end up putting dough into it only to find out he needs to spend more. Then he can shop the job and see if anyone will do it within budget.

    I suspect that if there's a co-op, or a local fixit shop he'll be able to get this rolling for a small outlay. If it's otherwise fairly new, it's less than starting fresh. OTOH- if there are other issues, even if it's only worn tires and brake shoes, then he might not be willing to put another penny into it.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  18. #18
    Can'tre Member 3alarmer's Avatar
    Join Date
    Nov 2010
    Location
    ,location, location...
    My Bikes
    old ones
    Posts
    7,009
    Mentioned
    106 Post(s)
    Tagged
    3 Thread(s)
    ..yes, we do that here. I'm just not real clear on the availability of such things in a place where they speak in pounds instead of dollars.

    Again, I think that absent free ( or nearly free) labor on this, it's not gonna pencil out. But we're all just guessing here.
    Quote Originally Posted by The Australian Book of Atheism
    There is only no god, and Cyclaholic is his prophet.

  19. #19
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    20,714
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by 3alarmer View Post
    ..yes, we do that here. I'm just not real clear on the availability of such things in a place where they speak in pounds instead of dollars.

    Again, I think that absent free ( or nearly free) labor on this, it's not gonna pencil out. But we're all just guessing here.
    The UK has a large network of co-ops or community bike shops or whatever they call them there. The OP has nothing to lose by shopping the job around.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  20. #20
    Senior Member
    Join Date
    Jul 2010
    Posts
    100
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by FBinNY View Post
    Definitely not!!!!

    Right pedals have RH threads, and left pedals have left hand threads. Rather than remembering left from right, remember that turning the top toward the front tightens either, and back toward the back of the bike backs them out.
    ah, thank you. I seem to remember stripping the crankshaft thread on my new bike in my younger cycling days and never really figured out what I did wrong. What's odd is that the pedal would even go in if you are turning it the wrong way.

  21. #21
    Can'tre Member 3alarmer's Avatar
    Join Date
    Nov 2010
    Location
    ,location, location...
    My Bikes
    old ones
    Posts
    7,009
    Mentioned
    106 Post(s)
    Tagged
    3 Thread(s)
    postscript to the above conversation between FB and me:

    I had a feeling I was forgetting something, because I know that we usually don't do insert repairs of stripped crank
    arm pedal threads on the lower end bikes that come from China right now in great abundance.

    I worked a pretty busy day at the bike co-op yesterday, and ended up doing a couple of these for people of very
    limited means, and in doing the fix, it became obvious that the reason we don't repair the cheap cranks is that there
    is an overabundant supply of them (in relatively good shape in terms of wear...they usually have steel chainrings that
    are riveted to the crank). The bicycles themselves usually fail in some other way and then get stripped for usable
    parts long before the crank arms are a problem. WE have so many that I can sell someone a low end, Chinese crank
    set for less than I have to charge for the rethreading inserts, which cost us about 8 bucks each side.

    So while it seems nucking futs, what happened yesterday is I went to the drawer and pulled out usable cranks,
    swapped them out, and tossed the old ones into recycling.

    To the OP: If, in your country, the low end bike situation is similar and the co-op situation is usable by you, this is your best bet.
    Quote Originally Posted by The Australian Book of Atheism
    There is only no god, and Cyclaholic is his prophet.

  22. #22
    Recreational Commuter
    Join Date
    Apr 2006
    Location
    Central Ohio
    My Bikes
    Two brand-less build-ups.
    Posts
    998
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by koolerb View Post
    Or if you want to do it yourself heliciol kits are pretty inexpensive. They come with a drill bit, tap, and heliciols. Everything you need but the drill.
    You need to be very careful when drilling out the old threads and tapping for the helicoil that you are perpindicular to the crankarm. Doing it with a hand drill, it would be very easy to get off-axis in an alloy crank arm. You may do better to take it to a local machine shop, or use a piloted reamer, rather than a drill.
    Riding the Ohio MS Central Ohio Challenge tour, July 12th.

  23. #23
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    20,714
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)
    Quote Originally Posted by 3alarmer View Post
    postscript to the above conversation between FB and me:

    I had a feeling I was forgetting something, because I know that we usually don't do insert repairs of stripped crank
    arm pedal threads on the lower end bikes that come from China right now in great abundance.
    +1, the issue isn't how the bike is repaired, but that there are low cost ways to do it. This is why I suggested a co-op in the first place. The mechanic at the co-op, can offer a coil, used crank, or low end new crank, all of which should be reasonable compared to simply scrapping the bike --- IF, the crank is the only serious (read expensive) problem.
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  24. #24
    Senior Member
    Join Date
    Jul 2013
    Location
    Somewhere in TX
    My Bikes
    CAAD 9
    Posts
    608
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I messed up a cheap set of Truvativ cranks. The pedal unthreaded while I was riding and stripped the last few threads as my foot pulled it out. What I did was thread the pedal into the crank from the opposite side. This cleaned up the damaged threads. Might try that first.

  25. #25
    Senior Member
    Join Date
    Jan 2013
    Location
    High Plains
    My Bikes
    old clunker
    Posts
    798
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by pg008970 View Post
    Hi everyone,

    I bought a new bike in November last year. Last month . . .
    Warranty?

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •