Wibbly wobbly....

Come and join in the banter: discuss here anything you want, whether bike related or not!
User avatar
gtvlusso
Posts: 4705
Joined: Tue Jan 22, 2008 16:09 pm

Re: Wibbly wobbly....

Postby gtvlusso » Fri Jan 11, 2013 12:02 pm

Kieran_Burns wrote:
UndercoverElephant wrote:
Kieran_Burns wrote:My method is to tighten as much as is comfortable and then a 1/4 turn more. Quick and dirty I know but I've not stripped a thread yet and never had a crank come loose.


Torque wrenches are cool and make you feel like a proper bike-mechanic: Accept no substitute.


Ha.

Real men used:

Image


Mmmmm - cotter pin.....The pinnacle of 1940's technology.

User avatar
gtvlusso
Posts: 4705
Joined: Tue Jan 22, 2008 16:09 pm

Re: Wibbly wobbly....

Postby gtvlusso » Fri Jan 11, 2013 12:11 pm

gtvlusso wrote:So, it's not the crank bolts!

Done up to 40Nm - still a wobble on the spider. I think it is the chainring that is warped or maybe even split, but I did not get time to inspect it.....

Any other ideas - BB still looks solid!


Just asking, again!

User avatar
Sharkyssurfers
Posts: 749
Joined: Wed Apr 13, 2011 09:12 am

Re: Wibbly wobbly....

Postby Sharkyssurfers » Fri Jan 11, 2013 12:24 pm

checked the pedals? loose cleat? or it could be your legs!!
Sorry its not me it's the bike ;o)

Strava Dude link http://www.strava.com/athletes/amander
Commuting, Domestic & Pleasure : Specialized Sectuer Sport Disc

Please Sponsor http://www.justgiving.com/alister-manderfield1

User avatar
gtvlusso
Posts: 4705
Joined: Tue Jan 22, 2008 16:09 pm

Re: Wibbly wobbly....

Postby gtvlusso » Fri Jan 11, 2013 12:45 pm

Sharkyssurfers wrote:checked the pedals? loose cleat? or it could be your legs!!


Nope - I can see the actual chainring/chainset is malformed - when rotating. But cannot identify if it is crank spider, chainring, crank bolts loose or BB loose......

There will always be some flex in the chainring, but not to this degree.

User avatar
rjsterry
Posts: 8506
Joined: Fri Nov 13, 2009 18:26 pm

Re: Wibbly wobbly....

Postby rjsterry » Sat Jan 12, 2013 01:25 am

I think some disassembly is needed. Remove the chainring and lay it on a flat surface - that'll show up if it's bent. It'll also let you get a good look at the bolts. If neither of those then that leaves the crank/spider. You'd need a manufacturing fault or a really big knock to bend those, but if you've eliminated other options...

One other thought: when you first assembled the whole thing, is there a chance that something got between the square taper of the BB and the socket of the crank? That could give you the tightness on the crank bolt, but still some flex.
1997 Giant Peloton 7200 - FCN 4 (5 if it looks like rain)
1985 Mercian King of Mercia - work in progress (Hah! Who am I kidding?)
1980s BSA 10sp

"Be there, eat sausages, gain ultimate respect"


Return to “Commuting Chat”

Who is online

Users browsing this forum: No registered users and 1 guest