Bottom Bracket size?
03-22-02 | 08:35 AM
#2
feros ferio
Joined: Jul 2000
Posts: 22,398
Likes: 1,865
From: www.ci.encinitas.ca.us
Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
Relevant parameters:
1) Bearing cup diameters and threads -- most newer bikes use English/ISO, although some Italian makers stubbornly cling to their traditional standard. Pre-1985 French, German, Austrian, and Swiss bikes use much harder-to-find purely metric cups (sheldonbrown.com).
2) BB shell width: 68mm on most bikes, 70mm for Italian road bikes, or 73mm for most oversized aluminum frames. You can easily measure this parameter yourself.
3) Number of chainrings, which affects the spindle length.
4) Brand of crank, which affects the spindle taper.
5) With newer cranks and BBs, the type of crank-to-spindle connection, i.e., traditional square-taper vs. splined.
If in doubt, buy from a competent local bike shop, and bring in your frame and cranks to help them size up your requirements.
1) Bearing cup diameters and threads -- most newer bikes use English/ISO, although some Italian makers stubbornly cling to their traditional standard. Pre-1985 French, German, Austrian, and Swiss bikes use much harder-to-find purely metric cups (sheldonbrown.com).
2) BB shell width: 68mm on most bikes, 70mm for Italian road bikes, or 73mm for most oversized aluminum frames. You can easily measure this parameter yourself.
3) Number of chainrings, which affects the spindle length.
4) Brand of crank, which affects the spindle taper.
5) With newer cranks and BBs, the type of crank-to-spindle connection, i.e., traditional square-taper vs. splined.
If in doubt, buy from a competent local bike shop, and bring in your frame and cranks to help them size up your requirements.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
03-22-02 | 10:32 AM
#3
Vaguely on topic...
Can a UN72 be used as a direct replacement for a UN52, or are there differences besides weight?
Thanks
Richard
Can a UN72 be used as a direct replacement for a UN52, or are there differences besides weight?
Thanks
Richard
__________________
Currently riding an MTB with a split personality - commuting, touring, riding for the sake of riding, on or off road :)
Currently riding an MTB with a split personality - commuting, touring, riding for the sake of riding, on or off road :)
03-22-02 | 10:39 AM
#4
He is looking @ BB-ES70 there are 4 sizes. I could have been more specific before. It's a Trek Y-bike either med or large frame. Could I go to a website or something to get some specs on it?
03-22-02 | 11:49 AM
#5
Measure the length of the spindle; It will range from 107mm to over 120. Then measure the BB shell: most are 68; some 70 and 72. Take those 2 dimensions to a bike shop and they'll give you the right BB. You also need to tell them if it's for a double or triple chainring and the brand of cranks.
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ljbike
ljbike
03-23-02 | 08:44 PM
#8
feros ferio
Joined: Jul 2000
Posts: 22,398
Likes: 1,865
From: www.ci.encinitas.ca.us
Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
Originally posted by Richard D
Can a UN72 be used as a direct replacement for a UN52, or are there differences besides weight?
Can a UN72 be used as a direct replacement for a UN52, or are there differences besides weight?
I had always heard that Shimano uses the same taper, but a larger ultimate diameter, than Campagnolo, but I really would have expected a Shimano crankset to seat properly onto a UN-72 BB!
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
03-24-02 | 07:37 PM
#9
Senior Member
Joined: Jan 2002
Posts: 132
Likes: 0
From: San Jose, CA
Scubagirl
I major league screwed up and I am Sorry!!!!
The Y bike is a 73mm shell, still with a 47.5 chainline requiring a 113 spindle for Shimano XT, LX or Deore cranks.
I hope I didn't cause any problems.
I major league screwed up and I am Sorry!!!!
The Y bike is a 73mm shell, still with a 47.5 chainline requiring a 113 spindle for Shimano XT, LX or Deore cranks.
I hope I didn't cause any problems.
