Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-17-06, 05:37 PM   #1
caveat audiens
thismachinekillsfascists
Thread Starter
 
Join Date: Nov 2005
Location: Allston, MA
Bikes: http://fixedgeargallery.com/2005/oct/JeffreyKelley.htm
Posts: 25
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
R.I.P My bike

While installing my new pedals (one of my old ones tore apart), like an idiot, I cross-threaded the left crank. It was overwhelmingly stupid; I have a Thompsen bottom bracket, and they haven't made those in what, 40 years? After checking with Bicycle Bill's and Bikes Not Bombs, I officially have to declare my darling Naomi out of commission.

Seeing as how I'm nearly broke, I'll hopefully find another decent three-speed frame so I can transfer the 650A wheels over.

A moment of silence, please.
caveat audiens is offline   Reply With Quote
Old 02-17-06, 05:41 PM   #2
soyboy
Senior Member
 
soyboy's Avatar
 
Join Date: Aug 2005
Location: brooklyn
Bikes: raleigh gran prix converted to fixed
Posts: 941
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
wait is bikes not bombs a real thing? i've been working on starting a non profit by that name...damn i guess it was too good of a name not to be used already
soyboy is offline   Reply With Quote
Old 02-17-06, 05:45 PM   #3
caveat audiens
thismachinekillsfascists
Thread Starter
 
Join Date: Nov 2005
Location: Allston, MA
Bikes: http://fixedgeargallery.com/2005/oct/JeffreyKelley.htm
Posts: 25
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yup.

http://www.bikesnotbombs.org/
caveat audiens is offline   Reply With Quote
Old 02-17-06, 06:08 PM   #4
Ready to Ruck
Senior Member
 
Join Date: Jan 2006
Location: Austin TX
Bikes:
Posts: 455
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yeah but in Austin it isn't much compared to the successful bikes Across Borders.

still, they provide alot of cheap bike parts.
Ready to Ruck is offline   Reply With Quote
Old 02-17-06, 06:09 PM   #5
baxtefer
Cornucopia of Awesomeness
 
baxtefer's Avatar
 
Join Date: Oct 2004
Location: not where i used to be
Bikes:
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
it might be salvagable.

have you tried chasing the threads? sometimes this works
if that doesn't you could drill out the hole and install a helicoil.
baxtefer is offline   Reply With Quote
Old 02-17-06, 06:21 PM   #6
Mouton
PS NOT STOLEN
 
Mouton's Avatar
 
Join Date: Oct 2004
Location: San Francisco, CA
Bikes: 57cm NJS Bridgestone
Posts: 631
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What happened to replacing your cranks and bottom bracket instead of throwing your whole frame out?
Mouton is offline   Reply With Quote
Old 02-17-06, 06:35 PM   #7
Sin-A-Matic
Senior Member
 
Join Date: Oct 2005
Location: Seattle, WA
Bikes:
Posts: 479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I obviously don't know enough about bike maintenace. How does one ruin a bottom bracket shell while replacing a pedal?
Sin-A-Matic is offline   Reply With Quote
Old 02-17-06, 06:46 PM   #8
Kellan
mrme
 
Kellan's Avatar
 
Join Date: Dec 2005
Location: NEDC
Bikes:
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I think his BB might be unique in size and threading (is it an Ashtabula?), however, there might be an adapter of some sort. Check with Sheldon, perhaps. A quick scan of his page didn't bring anything up, but that doesn't mean there's nothing, hopefully. It would seem possible that other bikes of the era used interchangeable one piece cranks.

Last edited by Kellan; 02-17-06 at 06:53 PM.
Kellan is offline   Reply With Quote
Old 02-17-06, 06:58 PM   #9
gnatthew
best-dressed mess
 
gnatthew's Avatar
 
Join Date: Oct 2004
Location: SF -> BK
Bikes: 2 Unicycles duct taped together
Posts: 305
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Worse comes to abosolute worse you can use a non-threaded compression bottom bracket.


http://www.bikepro.com/products/bott...ets/mavic.html
gnatthew is offline   Reply With Quote
Old 02-17-06, 06:59 PM   #10
SyntaxPC
!Newbie, !Senior Member
 
SyntaxPC's Avatar
 
Join Date: May 2004
Location: Philadelphia, PA
Bikes: IRO Mark V Track Bike, 1976 Schwinn Sprint Fixed Gear Conversion, 1975 Alan Aluminum Lugged Road Bike, Cannondale Touring, GanWell Road
Posts: 246
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by caveat audiens
I have a Thompsen bottom bracket, and they haven't made those in what, 40 years? After checking with Bicycle Bill's and Bikes Not Bombs, I officially have to declare my darling Naomi out of commission.
Before you give up, try and see if Via Bicycle have the parts you need.
SyntaxPC is offline   Reply With Quote
Old 02-17-06, 07:01 PM   #11
Kellan
mrme
 
Kellan's Avatar
 
Join Date: Dec 2005
Location: NEDC
Bikes:
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Actually, I did a little more research, and Thompson is neither one piece or Ashtabula, however, it's still likely that you can find something that'll work. gatthew's suggestion is one possibility.
Kellan is offline   Reply With Quote
Old 02-17-06, 07:04 PM   #12
Kellan
mrme
 
Kellan's Avatar
 
Join Date: Dec 2005
Location: NEDC
Bikes:
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The left (non-drive side) crank is removable, right? So all you're really looking for is the left crank arm. That should be possible to find. Lots of old bike parts out there among vintage enthusiasts.
Kellan is offline   Reply With Quote
Old 02-17-06, 07:16 PM   #13
CF4L
Free Loader
 
CF4L's Avatar
 
Join Date: Dec 2004
Location: albany.ny.
Bikes: Trash... for serious.
Posts: 407
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
is there room to put a helicoil in? you may be able to drill out the hole, retap with the helicoil size and then have the same pedal threading. check it out if youre not used to working with these. I imagine a machine shop could do it for you for cheap.

CF4L is offline   Reply With Quote
Old 02-17-06, 07:24 PM   #14
Sin-A-Matic
Senior Member
 
Join Date: Oct 2005
Location: Seattle, WA
Bikes:
Posts: 479
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Kellan
I think his BB might be unique in size and threading (is it an Ashtabula?), however, there might be an adapter of some sort. Check with Sheldon, perhaps. A quick scan of his page didn't bring anything up, but that doesn't mean there's nothing, hopefully. It would seem possible that other bikes of the era used interchangeable one piece cranks.
Ah, I see now.

I'd def. try some of the other options before tossing the frame.
Sin-A-Matic is offline   Reply With Quote
Old 02-17-06, 07:39 PM   #15
MKRG
Senior Member
 
Join Date: Sep 2002
Location: by a big river
Bikes:
Posts: 2,459
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Way to help kids!
MKRG is offline   Reply With Quote
Old 02-17-06, 08:06 PM   #16
caveat audiens
thismachinekillsfascists
Thread Starter
 
Join Date: Nov 2005
Location: Allston, MA
Bikes: http://fixedgeargallery.com/2005/oct/JeffreyKelley.htm
Posts: 25
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hey, thanks for all the good ideas.

About Helicoiling: would that be strong enough to be reliable? I mean, if I'm sprinting down a busy road, I don't want my pedal breaking out...
caveat audiens is offline   Reply With Quote
Old 02-17-06, 09:34 PM   #17
CF4L
Free Loader
 
CF4L's Avatar
 
Join Date: Dec 2004
Location: albany.ny.
Bikes: Trash... for serious.
Posts: 407
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
helicoiling is very strong if done correctly. if the cranks are Aluminum (it seems as though they may be steel) you are really just increasing the size of the steel threads, which is stronger. but yea, either way helicoils or anything like that is very stong and reliable if done correctly. You can also add just a little bit of loctite to the insert so that you are sure only the pedal comes out when removing them.

the "kit" is kinda pricy sometime, so try to find someone that has the tap and stuff already cause an insert is only a buck or two
CF4L is offline   Reply With Quote
Old 02-18-06, 02:50 PM   #18
pjay
atom smasher
 
pjay's Avatar
 
Join Date: Jul 2005
Location: kittery me
Bikes: univega fixie road convo
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What about the "lefty tighty righty loosy" aspect of pedal threading? can a machine shop do that?

I ask because I have a pedal threading that got pretty messed up from frequently switching pedal sets, and when it goes I'd like to save my cranks if possible.
pjay is offline   Reply With Quote
Old 02-18-06, 02:59 PM   #19
LóFarkas
LF for the accentdeprived
 
Join Date: May 2005
Location: Budapest, Hungary
Bikes:
Posts: 3,549
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
BTW, what's that bike setup like? Oddball BB thread and oddball BB/crank interface and so no way of replacing the cranks?
LóFarkas is offline   Reply With Quote
Old 02-18-06, 03:34 PM   #20
caveat audiens
thismachinekillsfascists
Thread Starter
 
Join Date: Nov 2005
Location: Allston, MA
Bikes: http://fixedgeargallery.com/2005/oct/JeffreyKelley.htm
Posts: 25
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah, the bottom bracket has no threads, just cups pressed into the shell. The axle/right crank/chainwheel are all one piece, and the left side of the axle is threaded for a cone that holds the whole thing on. The left crank attatches via a cotter pin - but apparently, it's a strange size so I couldn't just use a Raleigh left cottered crank or anything.

I think I'm going to start calling machine shops around here and see about helicoiling.

(Damn, I wish I got that $25 Paramount that was on craigslist yesterday... That would've solved all my problems!)
caveat audiens is offline   Reply With Quote
Old 02-18-06, 04:36 PM   #21
baxtefer
Cornucopia of Awesomeness
 
baxtefer's Avatar
 
Join Date: Oct 2004
Location: not where i used to be
Bikes:
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
what size is the BB shell?
You might be able to press in some cartridge bearings and a regular BB spindle like this repair to a viscount bottom bracket...
http://bikecult.com/works/parts/bbViscount.html
baxtefer is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:01 PM.