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 07-16-14, 10:12 PM   #1
Duane Behrens
Senior Member
Thread Starter
 
Duane Behrens's Avatar
 
Join Date: Mar 2010
Location: Minnesota and Southern California
Bikes: Specialized Tarmac (carbon), Specialized Roubaix (carbon, wifey), Raleigh Super Course (my favorite), and 2 Centurion project bikes.
Posts: 623
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chainrings for 144 BCD?

The bike is an '84 Raleigh Super Course. The crank is stamped with the Raleigh logo. The existing BCD for that crank is 144 mm. The existing chain rings are 52 x 42. I'd like to change these to something a bit more hill-friendly if I can; a 50 x 34 or even a 53 x 39. But the commonly available chain rings seem to come only in 110 BCD or 130 BCD. Is there a good source out there for 144 BCD chain rings? Thanks in advance. DB
Duane Behrens is offline   Reply With Quote
Old 07-16-14, 10:17 PM   #2
ThermionicScott 
Gratuitous glib and snark
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers)
Posts: 13,597
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 207 Post(s)
41T is the smallest possible chainring for 144 BCD, and that's pretty rare. You'll probably need to switch to a different crankset or freewheel/cassette to get lower gears...

(FWIW, Vuelta makes chainrings in 144 BCD, and forum member puchfinnland has/had some NOS chainrings kicking around.)
__________________
Quote:
Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
RUSA #7498
ThermionicScott is offline   Reply With Quote
Old 07-16-14, 11:15 PM   #3
gl98115
Senior Member
 
Join Date: Apr 2014
Bikes:
Posts: 328
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
You can't.
gl98115 is offline   Reply With Quote
Old 07-16-14, 11:33 PM   #4
hueyhoolihan
Senior Member
 
Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Bikes: 7⃥ 9 road bikes
Posts: 6,401
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i've got a nice old 144 BCD crank and i buy new chainrings for it all the time. look on ebay. as stated, there are limits, like on all cranks, on how low you can go though on a chainring directly connected to the spider.

Last edited by hueyhoolihan; 07-16-14 at 11:37 PM.
hueyhoolihan is offline   Reply With Quote
Old 07-16-14, 11:48 PM   #5
ThermionicScott 
Gratuitous glib and snark
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers)
Posts: 13,597
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 207 Post(s)
Quote:
Originally Posted by hueyhoolihan View Post
as stated, there are limits, like on all cranks, on how low you can go though on a chainring directly connected to the spider.
Ooh, good point! With a "tripleizer" chainring, you can attach a granny ring to the now-middle 42T inner chainring. I think pastorbobnlnh has started making those, after other outfits stopped.

http://www.redclovercomponents.com/1...triplizer.html
__________________
Quote:
Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
RUSA #7498

Last edited by ThermionicScott; 07-16-14 at 11:52 PM.
ThermionicScott is offline   Reply With Quote
Old 07-17-14, 06:46 AM   #6
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: 28,917
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
As noted, you already have what is realistically the smallest commonly available chainring (42T) that will fit on a 144 mm BCD. If you want smaller rings, you need a completely different crank. A 130 BCD will take down to 38T and a 110 will take a 33T but 39 and 34 are far more common.
HillRider is offline   Reply With Quote
Old 07-17-14, 07:41 AM   #7
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 20,370
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 638 Post(s)
Others have drilled and tapped the crankarms to mount a 3rd chainring , including Campagnolo them selves..

I have a Gippiemme triple (will sell) they made theirs so the 3rd ring an 86bcd
went into the back side of the crank spider, made thicker so hole didn't go through.

I have it set up as a 36 - 52 + a Campag 222. chain guard disc as the outside ring . looks great, too ..
fietsbob is offline   Reply With Quote
Old 07-17-14, 10:27 PM   #8
Duane Behrens
Senior Member
Thread Starter
 
Duane Behrens's Avatar
 
Join Date: Mar 2010
Location: Minnesota and Southern California
Bikes: Specialized Tarmac (carbon), Specialized Roubaix (carbon, wifey), Raleigh Super Course (my favorite), and 2 Centurion project bikes.
Posts: 623
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks, all. Have disassembled and serviced cranks and bearings but have never replaced them with a different size. If I DO replace them I guess a 110 would be the way to go. Will there be issues I should be aware of? BB length, diameter, threading, etc.? Appreciate your input . . . DB
Duane Behrens is offline   Reply With Quote
Old 07-17-14, 11:26 PM   #9
ThermionicScott 
Gratuitous glib and snark
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers)
Posts: 13,597
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 207 Post(s)
Quote:
Originally Posted by Duane Behrens View Post
Thanks, all. Have disassembled and serviced cranks and bearings but have never replaced them with a different size. If I DO replace them I guess a 110 would be the way to go. Will there be issues I should be aware of? BB length, diameter, threading, etc.? Appreciate your input . . . DB
If the manufacturer of your new crankset is nice enough, they'll provide a recommended BB length, and attachment type. From there, you'd just get the right BB for your frame.

If buying another C&V crankset, a lot of that data is here: http://www.velobase.com/
__________________
Quote:
Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
RUSA #7498
ThermionicScott is offline   Reply With Quote
Old 11-30-14, 06:57 PM   #10
Duane Behrens
Senior Member
Thread Starter
 
Duane Behrens's Avatar
 
Join Date: Mar 2010
Location: Minnesota and Southern California
Bikes: Specialized Tarmac (carbon), Specialized Roubaix (carbon, wifey), Raleigh Super Course (my favorite), and 2 Centurion project bikes.
Posts: 623
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by ThermionicScott View Post
If the manufacturer of your new crankset is nice enough, they'll provide a recommended BB length, and attachment type. From there, you'd just get the right BB for your frame.

If buying another C&V crankset, a lot of that data is here: VeloBase.com
Thanks to all. Just to close this thread out, I found an '84 Centurion Lemans which came with a 110 BCD crank - rare for its day, apparently. That crank came with a 52x40 (not 52x42) crankset. It swapped right out with the Super Course's 52x42 crankset. I then ordered up a single 34t inner chainring from Harris Cyclery for $15. Bolted that onto the 110 BCD. I didn't even have to change the spindle bolt or chain length. A mere adjustment of the front derailleur and I was on my way, climbing these local steep hills like nobody's business.

I offer this up here for any who are considering the same sort of change. I COULD have ordered a new 110 bcd crankset, and probably will when I get going on the Centurion bikes. But for now, I've temporarily saved about $150 with this simple swap. DB
Duane Behrens is offline   Reply With Quote
Old 11-30-14, 07:54 PM   #11
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: 28,917
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Quote:
Originally Posted by Duane Behrens View Post
Just to close this thread out, I found an '84 Centurion Lemans which came with a 110 BCD crank - rare for its day, apparently.
110 BCD cranks were not at all rare in the 1980's. SR, Sun Tour and Suguino all made them and they were common on mid to lower cost decent bikes. My '85 Bridgestone 400 came with an SR 110 bcd crank with 52/42 chianrings and with a second set of 74 mm threaded holes for a granny ring that was optional.
HillRider is offline   Reply With Quote
Old 11-30-14, 08:17 PM   #12
Duane Behrens
Senior Member
Thread Starter
 
Duane Behrens's Avatar
 
Join Date: Mar 2010
Location: Minnesota and Southern California
Bikes: Specialized Tarmac (carbon), Specialized Roubaix (carbon, wifey), Raleigh Super Course (my favorite), and 2 Centurion project bikes.
Posts: 623
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by HillRider View Post
110 BCD cranks were not at all rare in the 1980's. SR, Sun Tour and Suguino all made them and they were common on mid to lower cost decent bikes. My '85 Bridgestone 400 came with an SR 110 bcd crank with 52/42 chianrings and with a second set of 74 mm threaded holes for a granny ring that was optional.
Good to know. Thanks.
Duane Behrens is offline   Reply With Quote
Old 11-30-14, 10:32 PM   #13
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 20,370
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 638 Post(s)
TA makes a 41 tooth chainring, That's as small as will fit on a 144 crank .
fietsbob 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 03:55 PM.