Forever loosening crank arm
- sil3nt
- Posts: 116
- Joined: Mon Mar 12, 2012 6:58 pm
- Location: Perth WA
- Contact:
Forever loosening crank arm
Postby sil3nt » Thu Jul 25, 2013 3:15 pm
Does anyone have any suggestions here ? I am open to anything at this stage as it's becoming quite annoying.
Cheers
Rides : Merida Reacto 907E & The SS Larry
-
- Posts: 5131
- Joined: Mon Apr 20, 2009 10:41 pm
Re: Forever loosening crank arm
Postby rkelsen » Thu Jul 25, 2013 3:23 pm
If it's the Track version, then you probably need to tighten the bolt more. The torque specification on square taper BBs is quite high (something like 50Nm, IIRC), so you need to go "gorilla" on it.
I have no experience with the Road version. Sorry.
- sil3nt
- Posts: 116
- Joined: Mon Mar 12, 2012 6:58 pm
- Location: Perth WA
- Contact:
Re: Forever loosening crank arm
Postby sil3nt » Thu Jul 25, 2013 3:49 pm
Rides : Merida Reacto 907E & The SS Larry
-
- Posts: 82
- Joined: Mon Feb 04, 2013 12:28 pm
Re: Forever loosening crank arm
Postby apollocreed » Thu Jul 25, 2013 3:57 pm
Alternatively, buy these:
OR a torque wrench, if you want to spend the money
-
- Posts: 5131
- Joined: Mon Apr 20, 2009 10:41 pm
Re: Forever loosening crank arm
Postby rkelsen » Thu Jul 25, 2013 4:01 pm
A set like this:
http://www.bunnings.com.au/products_pro ... 22315.aspx
Coupled with one of these:
http://www.bunnings.com.au/products_pro ... e=products
Otherwise, any long-handled 3/8" or 1/2" drive ratchet with the set above will do it.
Edit: Beaten to the punch!
- sil3nt
- Posts: 116
- Joined: Mon Mar 12, 2012 6:58 pm
- Location: Perth WA
- Contact:
Re: Forever loosening crank arm
Postby sil3nt » Thu Jul 25, 2013 4:05 pm
Thanks Kind Sir's you both have been very helpful. I shall make the arduous journey to Bunnings, some 500m from my house and buy something akin to your suggestions.rkelsen wrote:You won't get it anywhere near tight enough with a multi-tool.
A set like this:
http://www.bunnings.com.au/products_pro ... 22315.aspx
Coupled with one of these:
http://www.bunnings.com.au/products_pro ... e=products
Otherwise, any long-handled 3/8" or 1/2" drive ratchet with the set above will do it.
Edit: Beaten to the punch!
Cheers
Rides : Merida Reacto 907E & The SS Larry
- Mulger bill
- Super Mod
- Posts: 29060
- Joined: Sun Sep 24, 2006 2:41 pm
- Location: Sunbury Vic
Re: Forever loosening crank arm
Postby Mulger bill » Thu Jul 25, 2013 8:05 pm
London Boy 29/12/2011
- sil3nt
- Posts: 116
- Joined: Mon Mar 12, 2012 6:58 pm
- Location: Perth WA
- Contact:
Re: Forever loosening crank arm
Postby sil3nt » Thu Jul 25, 2013 8:21 pm
No maybe a couple of hundred meters at max I stopped as soon as I felt some play in my pedal stroke.Mulger bill wrote:I hate to go all Jeremiah here but I'm wondering if you've ridden her far with the crank loose?
I hope I have not done any damage in doing so put see what happens after I give her a really good tighten up.
Rides : Merida Reacto 907E & The SS Larry
- Mulger bill
- Super Mod
- Posts: 29060
- Joined: Sun Sep 24, 2006 2:41 pm
- Location: Sunbury Vic
Re: Forever loosening crank arm
Postby Mulger bill » Thu Jul 25, 2013 8:46 pm
For a tool, I found an 8mm hex at a crime convergers, hacksawed it in half and took it to work where the lads in the shed welded 400mm of 10mm bar into the middle.
London Boy 29/12/2011
- sil3nt
- Posts: 116
- Joined: Mon Mar 12, 2012 6:58 pm
- Location: Perth WA
- Contact:
Re: Forever loosening crank arm
Postby sil3nt » Thu Jul 25, 2013 9:18 pm
Yeah that hurts fingers,crossed:/Mulger bill wrote:Sounds good then, riding a loose arm will bork the taper very quickly. Guess how I know
For a tool, I found an 8mm hex at a crime convergers, hacksawed it in half and took it to work where the lads in the shed welded 400mm of 10mm bar into the middle.
Rides : Merida Reacto 907E & The SS Larry
- foo on patrol
- Posts: 9073
- Joined: Sat Dec 19, 2009 11:12 am
- Location: Sanstone Point QLD
Re: Forever loosening crank arm
Postby foo on patrol » Sun Jul 28, 2013 6:17 am
My son did this with my MB, only trouble was, he road around for a couple of days with it like this and flogged out the arm.Mulger bill wrote:I hate to go all Jeremiah here but I'm wondering if you've ridden her far with the crank loose?
Foo
Goal 6000km
- Yankers
- Posts: 31
- Joined: Fri Aug 02, 2013 3:29 am
Re: Forever loosening crank arm
Postby Yankers » Sat Aug 03, 2013 12:13 am
-
- Posts: 121
- Joined: Wed May 23, 2012 5:19 pm
Re: Forever loosening crank arm
Postby PANZR » Sat Aug 03, 2013 9:36 pm
Are you using an ISO or JIS taper BB?
If they're not matched, this could be the reason even though you say it's only occuring on one side
For example; if an ISO taper crank is forced onto a JIS taper BB too much it can negatively affect the taper surface of the cranks, causing it to become loose over time
-
- Posts: 13
- Joined: Fri Aug 09, 2013 10:15 pm
- Location: St. Georges, South Australia
Re: Forever loosening crank arm
Postby Croweater » Sun Aug 11, 2013 9:05 am
Hey mate,rkelsen wrote:You won't get it anywhere near tight enough with a multi-tool.
A set like this:
http://www.bunnings.com.au/products_pro ... 22315.aspx
Coupled with one of these:
http://www.bunnings.com.au/products_pro ... e=products
Otherwise, any long-handled 3/8" or 1/2" drive ratchet with the set above will do it.
Edit: Beaten to the punch!
My Dura Ace 7900 crankset just came loose. I coasted down hill back home but didn't pedal at all.
I'm shitting myself, I hope I haven't stuffed it up! My LBS is closed as it's a Sunday, but need re-assurance I haven't buggered anything! Haha.
2011 Orbea Carpe- Sora/Tiagra
Peter Sagan showman appreciator!
-
- Posts: 5131
- Joined: Mon Apr 20, 2009 10:41 pm
Re: Forever loosening crank arm
Postby rkelsen » Sun Aug 11, 2013 9:32 am
Don't use any of the advice above on yours. Wait until an LBS can look at it.
- Mulger bill
- Super Mod
- Posts: 29060
- Joined: Sun Sep 24, 2006 2:41 pm
- Location: Sunbury Vic
Re: Forever loosening crank arm
Postby Mulger bill » Sun Aug 11, 2013 3:04 pm
What tools do you have/can borrow? No biggie.Croweater wrote:Hey mate,rkelsen wrote:You won't get it anywhere near tight enough with a multi-tool.
A set like this:
http://www.bunnings.com.au/products_pro ... 22315.aspx
Coupled with one of these:
http://www.bunnings.com.au/products_pro ... e=products
Otherwise, any long-handled 3/8" or 1/2" drive ratchet with the set above will do it.
Edit: Beaten to the punch!
My Dura Ace 7900 crankset just came loose. I coasted down hill back home but didn't pedal at all.
I'm shitting myself, I hope I haven't stuffed it up! My LBS is closed as it's a Sunday, but need re-assurance I haven't buggered anything! Haha.
London Boy 29/12/2011
- Yankers
- Posts: 31
- Joined: Fri Aug 02, 2013 3:29 am
Re: Forever loosening crank arm
Postby Yankers » Sun Aug 11, 2013 4:11 pm
You'll be right - definitely did the right thing by not pedaling anymore - that's where the damage gets done.Croweater wrote:Hey mate,rkelsen wrote:You won't get it anywhere near tight enough with a multi-tool.
A set like this:
http://www.bunnings.com.au/products_pro ... 22315.aspx
Coupled with one of these:
http://www.bunnings.com.au/products_pro ... e=products
Otherwise, any long-handled 3/8" or 1/2" drive ratchet with the set above will do it.
Edit: Beaten to the punch!
My Dura Ace 7900 crankset just came loose. I coasted down hill back home but didn't pedal at all.
I'm shitting myself, I hope I haven't stuffed it up! My LBS is closed as it's a Sunday, but need re-assurance I haven't buggered anything! Haha.
- ColinOldnCranky
- Posts: 6734
- Joined: Fri Feb 27, 2009 4:58 pm
Re: Forever loosening crank arm
Postby ColinOldnCranky » Sun Aug 11, 2013 5:54 pm
From experience that is indeed what caused your problem. And, in my experience, it doesn't have to be ridden while loose very far at all to do the damage. Further, again in my experience, you can tighten it up as hard as you like and used loktite and it will still keep on loosening )a Yankers indicated).sil3nt wrote:No maybe a couple of hundred meters at max I stopped as soon as I felt some play in my pedal stroke.Mulger bill wrote:I hate to go all Jeremiah here but I'm wondering if you've ridden her far with the crank loose?
I hope I have not done any damage in doing so put see what happens after I give her a really good tighten up.
I had to carry a socket set around for a month while I found a matching replacement. The crank would require tightening with every trip.
So my advice would be try what you can but don;t waste too much time or too much money in doing so. I expect that you only have one option.
My experience however is on a square taper crank and with no hardened square female that is separate from the body of the crank.
Return to “Fixed Gear/ Single Speed”
- General Australian Cycling Topics
- Info / announcements
- Buying a bike / parts
- General Cycling Discussion
- The Bike Shed
- Cycling Health
- Cycling Safety and Advocacy
- Women's Cycling
- Bike & Gear Reviews
- Cycling Trade
- Stolen Bikes
- Bicycle FAQs
- The Market Place
- Member to Member Bike and Gear Sales
- Want to Buy, Group Buy, Swap
- My Bikes or Gear Elsewhere
- Serious Biking
- Audax / Randonneuring
- Retro biking
- Commuting
- MTB
- Recumbents
- Fixed Gear/ Single Speed
- Track
- Electric Bicycles
- Cyclocross and Gravel Grinding
- Dragsters / Lowriders / Cruisers
- Children's Bikes
- Cargo Bikes and Utility Cycling
- Road Racing
- Road Biking
- Training
- Time Trial
- Triathlon
- International and National Tours and Events
- Cycle Touring
- Touring Australia
- Touring Overseas
- Touring Bikes and Equipment
- Australia
- Western Australia
- New South Wales
- Queensland
- South Australia
- Victoria
- ACT
- Tasmania
- Northern Territory
- Country & Regional
Who is online
Users browsing this forum: No registered users
- All times are UTC+10:00
- Top
- Delete cookies
About the Australian Cycling Forums
The Australian Cycling Forums is a welcoming community where you can ask questions and talk about the type of bikes and cycling topics you like.
Bicycles Network Australia
Forum Information
Connect with BNA
This website uses affiliate links to retail platforms including ebay, amazon, proviz and ribble.