Cracked nipples

Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
Technical discussion, description and outright lies

Cracked nipples

Postby igstar » Fri Mar 15, 2013 8:24 pm

Recently a nipple on my front wheel cracked. Upon closer inspection I identified half a dozen other cracked nipples. They are cracking lengthwise from where the spoke comes in. The nipples are aluminium and wheel has 32 spokes (2 cross).
The rear wheel has all the same components and configuration, but everything looks good.
Any ideas what could be causing this? Are different forces placing stress on the front wheel? I also read on another forum that sweat falling on front wheel could be causing corrosion, not sure how plausible that is.
igstar
 
Posts: 348
Joined: Mon Jan 12, 2009 9:54 pm
Location: Melbourne

by BNA » Fri Mar 15, 2013 9:02 pm

BNA
 

Re: Cracked nipples

Postby rkelsen » Fri Mar 15, 2013 9:02 pm

I find it hard to believe that sweat is making it all the way to the spoke nipples.

How old is the wheel? Has it seen many wet roads?

I'd be hesitant to ride it for too much longer. Losing a front wheel hurts.
User avatar
rkelsen
 
Posts: 4187
Joined: Mon Apr 20, 2009 10:41 pm

Re: Cracked nipples

Postby il padrone » Fri Mar 15, 2013 9:28 pm

Sweaty cracked nipples ??

Yeeooww!! :o :cry:

:twisted:
Riding bikes in traffic - what seems dangerous is usually safe; what seems safe is often more dangerous.
User avatar
il padrone
 
Posts: 17513
Joined: Mon Apr 07, 2008 11:57 pm
Location: Heading for home.

Re: Cracked nipples

Postby Dan » Sat Mar 16, 2013 7:38 am

il padrone wrote:Sweaty cracked nipples ??

Yeeooww!! :o :cry:

:twisted:


Shea butter, I'm told. ;)
User avatar
Dan
 
Posts: 3289
Joined: Fri Oct 16, 2009 12:32 pm
Location: Vegas, baby

Re: Cracked nipples

Postby igstar » Sat Mar 16, 2013 8:17 am

The wheels are 2 years old max. Ridden in all sort of weather. The puzzling thing as I said is that rear wheel is prefect...
I used velocity rims, Swiss spokes and campag hub. It's a racing bike so it's not carrying any heavy loads.
igstar
 
Posts: 348
Joined: Mon Jan 12, 2009 9:54 pm
Location: Melbourne

Re: Cracked nipples

Postby rkelsen » Sat Mar 16, 2013 9:15 am

Call me old fashioned, but I'm not 100% comfortable using aluminium for this sort of thing... for the very reason you've discovered.

Personally, I'd swap them out for brass ones, but I tend to prefer longevity at the cost of extra weight.
User avatar
rkelsen
 
Posts: 4187
Joined: Mon Apr 20, 2009 10:41 pm

Re: Cracked nipples

Postby kukamunga » Sat Mar 16, 2013 9:41 am

Too much tension? Not enough tension?

Like aluminium frames, aluminium nipples can get brittle and crack

I think I remember the same thing happening on a front wheel I built about fifteen years ago. Have never used aluminium nipples again

Brass
God save the ABC & SBS.....
User avatar
kukamunga
 
Posts: 3492
Joined: Sat Dec 08, 2007 9:12 am
Location: SE Melburbs, on a bike, on a train......

Re: Cracked nipples

Postby Mulger bill » Sat Mar 16, 2013 11:23 am

I had to look at the top of the page to be sure I hadn't stumbled into the health area...

Methinks it's time to hit up your retailer of choice for 64 brass nipples and some rebuilding time.
...whatever the road rules, self-preservation is the absolute priority for a cyclist when mixing it with motorised traffic.
London Boy 29/12/2011
User avatar
Mulger bill
Super Mod
Super Mod
 
Posts: 25275
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic

Re: Cracked nipples

Postby il padrone » Sat Mar 16, 2013 12:40 pm

Hmm... seems sweat can be a bit of a corrosion problem for some cyclists. I do well remember a mate of mine having his frame rust badly all around the head tube, top tube and down tube after just 4-5 years - not in a sea-air environment and stored indoors. His spokes were quite OK though.

This one is pretty bad :shock:

Image
Riding bikes in traffic - what seems dangerous is usually safe; what seems safe is often more dangerous.
User avatar
il padrone
 
Posts: 17513
Joined: Mon Apr 07, 2008 11:57 pm
Location: Heading for home.

Re: Cracked nipples

Postby marinmomma » Sat Mar 16, 2013 1:46 pm

Dan wrote:
il padrone wrote:Sweaty cracked nipples ??

Yeeooww!! :o :cry:

:twisted:


Shea butter, I'm told. ;)


Old midwives recommend cabbage leaves, so I've heard! :wink:
Lisa
marinmomma
 
Posts: 1984
Joined: Mon Jul 26, 2010 2:12 pm
Location: Southside Brisbane


Return to The Shed

Who is online

Users browsing this forum: Davidrnau, GeoffInBrisbane



Support BNA
Click for online shops
Torpedo 7 Torpedo7 AU
Ground Effect Ground Effect NZ
Chain Reaction Cycles CRC UK
Wiggle Wiggle UK
Cycling Express Cycling Express
Ebay Ebay AU
ProBikeKit ProBikeKit UK
Evans Cycles Evans Cycles UK
JensonUSA Jenson USA
JensonUSA Competitive Cyclist