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 06-18-05, 11:51 AM   #1
njwbert
Cycling Above All
Thread Starter
 
njwbert's Avatar
 
Join Date: Jun 2005
Location: Singapore
Bikes: Cervelo Prodigy 2002 and a 6sp steel frame coverted to fixed gear
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hi, I would like to ask for help from people who have done conversions of road frames to fixed.

At a bike shop I frequent, the owner has this red steel salsa cycles frame with a 126mm rear horizontal drop out spacing. I was planning to get some IRO hubs and respace the hubs to fit the rear dropout. Now the only thing that I have a bit of problem (and inexperience) with is the BB spacing. It has a 73mm BB width (English thread I think, not much time lately to check). So what do I put there to achieve the "magic" chainline of 42mm with Sugino 75 track cranks?

Would the difference between a 73mm and 68mm BB width affect the chainline? Like a 68x113 seems to me like an effective 73x108. Of course I can only think of this when I am tired at night and back from work and my head is killing me...

I have questions but being in a country where there are almost no fixed gear riders, no velodrome or riding track and almost no track parts available is a little tough to get answers. I have to mail order in the hubs, cranks, cog, lockring and crank (so far) to build up the frame. That or get the only track gruppo available here... Dura-Ace.

Last edited by njwbert; 06-18-05 at 11:53 AM. Reason: minor typos
njwbert is offline   Reply With Quote
Old 06-18-05, 01:53 PM   #2
Mr. Shadow
I need more bikes!!!
 
Mr. Shadow's Avatar
 
Join Date: May 2004
Location: Durham, NC
Bikes: 2 roadies, 7 fixed-gears, 1 hardtail, 1 full suspension mtb, and 1 hybrid...so far.
Posts: 472
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
As long as it's a straight chainline it should work fine.
I recently had an IRO hubbed wheel built up and it's wonderful.
Mr. Shadow is offline   Reply With Quote
Old 06-18-05, 06:57 PM   #3
dubteka
i hate haters
 
dubteka's Avatar
 
Join Date: Aug 2004
Location: San Francisco
Bikes: celo europa 80's track, colnago pista, samson keirin. bite me.
Posts: 560
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
the two standward bb witdths are 68mm (english) and 70mm(italian)...((then theres french, etc...) so depending on your frame, you should use the correct one, cause the other wont work!

what you need to be concerned with for chainline is the spindle length... depending on what cranks you have and what rear hubs you have, you need to get the according spindle length for the bb. standard seems to be about 111mm.. but depends on the entire setup. theres a wide number of spindle lengths available in all threadings of bb's. i used a 111bb on a 126 rear spaced frame, and it worked fine.

go here for some info: http://www.sheldonbrown.com/chainline/

good luck.
__________________
Samson.Colnago Pista.Celo Europa RIP
dubteka is offline   Reply With Quote
Old 06-18-05, 07:20 PM   #4
wilcru
Senior Member
 
Join Date: Aug 2004
Location: Atlanta
Bikes:
Posts: 84
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by njwbert
Would the difference between a 73mm and 68mm BB width affect the chainline?
No. A 109mm spindle is an 109mm spindle. The spindle length is not affected by the BB's shell size.
Quote:
So what do I put there to achieve the "magic" chainline of 42mm with Sugino 75 track cranks?
The Sugino 75 BB is for 68mm shells, and has a 109mm spindle.
I'd either buy a Shimano UN73 73x110mm and trade its "cups" for some Phil Wood Bottom Bracket Cups (that'll allow you to adjust your chainline), or I'd just go ahead and shell out for a 108mm Phil BB.
wilcru is offline   Reply With Quote
Old 06-18-05, 07:40 PM   #5
* jack *
|+|+|+|+|+|+|
 
* jack *'s Avatar
 
Join Date: Mar 2005
Location: Durham, NC
Bikes: more, please.
Posts: 1,514
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Be careful - depending on the frame, if you find a certain spindle length that would give you 'good' chainline,
that might result in moving the chainring too close to the chainstay.
* jack * is offline   Reply With Quote
Old 06-18-05, 08:01 PM   #6
peripatetic
Senior Member
 
peripatetic's Avatar
 
Join Date: Oct 2004
Location: NYC
Bikes: All 70s and 80s, only steel.
Posts: 2,124
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)


You might want to post a similar thread in the 'Mechanics' section, and maybe also email sheldon brown directly (try a members search in this forum.)

Tough situation you're in, but as with all things fixed, eventually fix-able.

peripatetic is offline   Reply With Quote
Old 06-18-05, 08:14 PM   #7
njwbert
Cycling Above All
Thread Starter
 
njwbert's Avatar
 
Join Date: Jun 2005
Location: Singapore
Bikes: Cervelo Prodigy 2002 and a 6sp steel frame coverted to fixed gear
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the advice. That removed the migraine.

Now I can go ahead and order online with confidence.

I will be thnking of other alternatives before the phil woods as my bike shop does not have the phill wood tools. Or would the regular park tools work as well?
njwbert is offline   Reply With Quote
Old 06-29-05, 08:25 AM   #8
njwbert
Cycling Above All
Thread Starter
 
njwbert's Avatar
 
Join Date: Jun 2005
Location: Singapore
Bikes: Cervelo Prodigy 2002 and a 6sp steel frame coverted to fixed gear
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I just received my order from Business Cycles today. Whoo hoo! All I need are the remaining stuff I ordered from Sheldon Brown and I can finally build up the bike.

Plus I am very happy. For an international order it took only 6 days to arrive. Great stuff. Prompt! Definitely two thumbs up and will order from them again.

Last edited by njwbert; 06-29-05 at 08:28 AM. Reason: addition to message
njwbert is offline   Reply With Quote
Old 06-29-05, 08:56 AM   #9
* jack *
|+|+|+|+|+|+|
 
* jack *'s Avatar
 
Join Date: Mar 2005
Location: Durham, NC
Bikes: more, please.
Posts: 1,514
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Good to hear. Post some photos for us.
* jack * is offline   Reply With Quote
Old 07-05-05, 09:11 PM   #10
njwbert
Cycling Above All
Thread Starter
 
njwbert's Avatar
 
Join Date: Jun 2005
Location: Singapore
Bikes: Cervelo Prodigy 2002 and a 6sp steel frame coverted to fixed gear
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Now I have a choice of old rims from my friend. What should i take?

1) single wall araya rims (pair)

2) mavic MA2 (pair)

3) one campagnolo omicron (rear) and one mavic ma3 (front)
njwbert is offline   Reply With Quote
Old 07-05-05, 09:26 PM   #11
jim-bob
hateful little monkey
 
jim-bob's Avatar
 
Join Date: May 2003
Location: oakland, ca
Bikes:
Posts: 5,274
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
MA-2s have always been good to me.
jim-bob is offline   Reply With Quote
Old 07-09-05, 08:28 AM   #12
njwbert
Cycling Above All
Thread Starter
 
njwbert's Avatar
 
Join Date: Jun 2005
Location: Singapore
Bikes: Cervelo Prodigy 2002 and a 6sp steel frame coverted to fixed gear
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yay my IRO hubs have arrived from Harris Cyclery! Cheers Sheldon!

Okay I have used the Rinard spoke excel spreadsheet to calculate the length and i got 298 mm which looked a little weird. Searching for posts of people who used the same build yielded a value of 294 mm though the rear hub spacing was not specified.

My choice is the IRO fixed/fixed rear hub (respaced to 126mm) and front hub. Laced 3x for both front and rear to Mavic MA-2 rims. What spoke length would I need? Anyone here did the same build?
njwbert is offline   Reply With Quote
Old 07-20-05, 07:12 AM   #13
njwbert
Cycling Above All
Thread Starter
 
njwbert's Avatar
 
Join Date: Jun 2005
Location: Singapore
Bikes: Cervelo Prodigy 2002 and a 6sp steel frame coverted to fixed gear
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My fixed gear bicycle is finally up! Picture is posted in the picture sticky.
njwbert 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 11:12 AM.