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


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 02-18-06, 12:18 AM   #1
stormywaters
dude.
Thread Starter
 
stormywaters's Avatar
 
Join Date: Nov 2004
Location: white turbo saddle
Bikes: mine
Posts: 52
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Question about threads: Vintage Super Record Headset

Will a 1'x24Tpi-BSC Headset work on my 1983 Bianchi Specialissima?

I Know BSC stands for British Standard Cycle, so will I mess up my threads trying to install this unit?

Do I need an Italian Specific Headset, or will this work? What about the whole thing about Italian threads being cut at 55 degrees?

Little help?
stormywaters is offline   Reply With Quote
Old 02-18-06, 08:51 AM   #2
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 29,122
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 180 Post(s)
Italian and "English" threaded headsets and forks aren't an exact match but will work with each other so you should have no problems. The difference is in the thread form angle (55 for Italian and 60 for English/ISO) but they have the same diameter and pitch.
HillRider is offline   Reply With Quote
Old 02-18-06, 11:35 AM   #3
Dr.Deltron
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
The headset should fit, but it WILL mess up the threads a bit. If this is a one-time-only instalation, you should be OK. Just don't try to re-install the headset back to a BSC fork/frame. The threads will start to rip out and bind tightly. Been there, done that (on a 1980 Bianchi, no less) Good Luck w/that. Dr. D. p.s. For a better result, find an Italian threaded headset on........eBay!!!
  Reply With Quote
Old 02-18-06, 11:56 AM   #4
ridesoldtrek
RidesOldTrek
 
Join Date: Aug 2005
Location: Minneapolis, MN
Bikes: '83 Trek 500 built up with modern & vintag parts, (original owner) 1976 Trek TX500 frame, 60's Raleigh Sports 3-speed
Posts: 120
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
My Sutherland's Handbook for Bicycle Mechanics, 3rd edition - 1980 describes the fit between british and italian headset threads as a "class B" fit, which is defined as:
"Will fit and be serviceable but slight damage to the parts may result."

I would make sure that the steering tube is italian threaded before you actually buy one. While it would seem to be, some manufacturers used british threading for bikes imported to the US. I have no idea if Bianchi did this at any time in the past, but some manufacturers did. Your local hardware store or bike shop should have a thread pitch gauge, just take the locknut in.
I would try other sources before ebay, even though I do buy on ebay, you should be able to find an italian headset from "regular" source. Just my opinion.
ridesoldtrek is offline   Reply With Quote
Old 02-18-06, 06:39 PM   #5
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 29,122
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 180 Post(s)
Quote:
Originally Posted by ridesoldtrek
Your local hardware store or bike shop should have a thread pitch gauge, just take the locknut in.
The thread pitch (and diameter) will match as I said above, It's the "form" of the threads that differs with the root and top angles being slightly different. A pitch gauge will tell you they are identical.
HillRider 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 04:10 PM.