question on bottom bracket
#1
the born loser wins again
Thread Starter
Join Date: Feb 2007
Location: Los Angeles
Posts: 5
Bikes: 2006 bianchi pista, 8330 treck full carbon mountain bike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
question on bottom bracket
i recently bought a '76 Raleigh Grand Prix. I the bottom bracket was completely ruined. i need to get a new one. I have a bunch of mountain bikes that are being put to use and i was wondering if i could use the bottom bracket off one of those. Would it fit or is there a special road type?
#2
Strange As Angels
Join Date: Nov 2006
Location: Longmont, CO
Posts: 465
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
It might work depending on the spindle length and some mtb are 68 shell and some are 73 so that part may be too wide.
#3
Senior Member
Join Date: Sep 2006
Location: Van BC
Posts: 3,744
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Quickest way to solve this problem is to take it to your lbs and have them install a new one. It shouldnt cost you more than $30 incl labour and possibly as low as $15. The slower way is to figure out whether your raleigh and mtb bb's match across three parameters:
1. bb shell width
2. bb spindle length
3. bb threading type.
You can get info about all this stuff at https://sheldonbrown.com/gloss_bo-z.html#bottom . I would classify this project as "hard for a newb" so unless you enjoy this type of thing you might want to lbs it.
Edit: A "hybrid" approach would be to go to your lbs and have them figure out what kind of bb you need, then buy that bb along with a bb tool & crank puller from them and do the rest yourself. Thats how I did my first bb replacement. With the tols it may well cost you more than a straight up bb replacement but you will have profited by gaining some knowhow.
Double edit: If youre planning to convert this raleigh to fixed/ss that opens up a whole nother can o worms with chainline.
1. bb shell width
2. bb spindle length
3. bb threading type.
You can get info about all this stuff at https://sheldonbrown.com/gloss_bo-z.html#bottom . I would classify this project as "hard for a newb" so unless you enjoy this type of thing you might want to lbs it.
Edit: A "hybrid" approach would be to go to your lbs and have them figure out what kind of bb you need, then buy that bb along with a bb tool & crank puller from them and do the rest yourself. Thats how I did my first bb replacement. With the tols it may well cost you more than a straight up bb replacement but you will have profited by gaining some knowhow.
Double edit: If youre planning to convert this raleigh to fixed/ss that opens up a whole nother can o worms with chainline.
Last edited by mander; 02-13-07 at 08:41 PM.
#4
Human
Join Date: Aug 2006
Location: The Euge
Posts: 25
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
The 76 Grand Prix uses the old Raleigh style threading, so you're not going to be able to easily switch anything out. Your LBS should be able to put in a new one for you though. I rebuilt a 76 last summer, cottered cranks and all, but couldn't find a replacement spindle because it wasn't even the standard spindle width so you can't just switch the spindle out either. Just LBS it.
#5
jack of one or two trades
Join Date: Jun 2005
Location: Suburbia, CT
Posts: 5,640
Bikes: Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Originally Posted by wetduck
The 76 Grand Prix uses the old Raleigh style threading, so you're not going to be able to easily switch anything out. Your LBS should be able to put in a new one for you though. I rebuilt a 76 last summer, cottered cranks and all, but couldn't find a replacement spindle because it wasn't even the standard spindle width so you can't just switch the spindle out either. Just LBS it.
Read this about Raleighs to understand why you will have trouble: https://sheldonbrown.com/raleigh26.html
#6
Senior Member
Join Date: Sep 2005
Location: London UK
Posts: 107
Bikes: ugly touring rig
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Originally Posted by wetduck
The 76 Grand Prix uses the old Raleigh style threading.