Hi All
I've been given the task of rejuvinating my mother-in-law's bicycle
She's had it since new and finds it comfortable, but I've been finding some really obsolete bits and pieces on it (as in, parts that weren't around for long, and were not high end at the time). I've figured out ways around most things, until I got to the bottom bracket. I measured the shell at 70mm. Goodo; possibly Italian, probably not though. Taking the crank off, I noticed that the square taper is bigger than JIS/ISO. Oh well, I'll replace the BB and the crankset with a JIS one, I thought.
I couldn't get the drive side to budge, so I got stuck into the non-drive side and was quite surprised with the way it came apart. The lockring was more of a sleeve than a standard lock ring, and removing the non-drive side cup I found what looked like a sleeve wedged into BB shell. There are no threads cut into the shell itself. Some gentle persuasion with a drift and a hammer and the whole sleeve popped out, with the drive side cup still in the sleeve. I haven't got a vice, so am struggling to uncouple them. It's also difficult to determine the thread direction on this side. Looking at it, it appears to be a RH thread. I'd be surprised if this was correct, but it would fit in with all of the other odd stuff going on with this bike.
So anyway, what have I got here? And what are my options to rebuild? Service the existing setup and try to find a 106BCD 3-arm chainring to replace the worn one? Replace with...?
Ta
Unknown bottom bracket
- WestcoastPete
- Posts: 911
- Joined: Thu Mar 19, 2009 5:59 pm
- Location: Peoples Republic of Coburg, Victoria
- RonK
- Posts: 11508
- Joined: Mon Aug 24, 2009 2:08 pm
- Location: If you need to know, ask me
- Contact:
Re: Unknown bottom bracket
Postby RonK » Wed Mar 13, 2013 3:37 pm
A threadless bottom bracket. Not so unusual. Perhaps one of these might serve.
Grand Cru Threadless Bottom Bracket
Grand Cru Threadless Bottom Bracket
Cycle touring blog and tour journals: whispering wheels...
- WestcoastPete
- Posts: 911
- Joined: Thu Mar 19, 2009 5:59 pm
- Location: Peoples Republic of Coburg, Victoria
Re: Unknown bottom bracket
Postby WestcoastPete » Wed Mar 13, 2013 4:01 pm
Thanks RonK
I did look at them. I'd have to get this cup off the drive side of this sleeve and then refit the sleeve. I can't think of a better idea I guess.
Ta
I did look at them. I'd have to get this cup off the drive side of this sleeve and then refit the sleeve. I can't think of a better idea I guess.
Ta
-
- Posts: 336
- Joined: Fri Jan 04, 2013 4:41 pm
Re: Unknown bottom bracket
Postby TTar » Wed Mar 13, 2013 4:03 pm
What's that little cutout on the underside of the BB shell in the first pic? Maybe it's somehow used to remove that drive-side section? Or maybe you just punch it out the same you punch out headset cones?
Can't you just leave it there and rejuvenate around it, is the BB unserviceable?
Sorry I can't offer any practical advice, but I love these little mysteries, especially when it's someone else who's doing all the work.
Can't you just leave it there and rejuvenate around it, is the BB unserviceable?
Sorry I can't offer any practical advice, but I love these little mysteries, especially when it's someone else who's doing all the work.
Sent from my fortified compound
- WestcoastPete
- Posts: 911
- Joined: Thu Mar 19, 2009 5:59 pm
- Location: Peoples Republic of Coburg, Victoria
Re: Unknown bottom bracket
Postby WestcoastPete » Wed Mar 13, 2013 4:20 pm
It's a notch that lines up with a tab on the drive side cup. That's why I couldn't remove the cup without punching the whole sleeve out.
- sturmey archer
- Posts: 237
- Joined: Tue May 04, 2010 8:14 pm
- Location: Melbourne
Re: Unknown bottom bracket
Postby sturmey archer » Wed Mar 13, 2013 4:47 pm
See this thread perhaps :
viewtopic.php?f=23&t=15586" onclick="window.open(this.href);return false;
Ive got a cotter type one of these I pulled from a MS "Super Star" as museum piece... If the cups are OK maybe a standard JIS taper shaft of the right length will fit ? The threaded cup is the same thread as a normal non drive BB cup so is assume the bearing race dia will be the same.
viewtopic.php?f=23&t=15586" onclick="window.open(this.href);return false;
Ive got a cotter type one of these I pulled from a MS "Super Star" as museum piece... If the cups are OK maybe a standard JIS taper shaft of the right length will fit ? The threaded cup is the same thread as a normal non drive BB cup so is assume the bearing race dia will be the same.
1.370" x 24 tpi - what sort of stupid standard is that?
- HLC
- Posts: 722
- Joined: Sun Mar 04, 2012 11:23 pm
- Location: Sydney.
Re: Unknown bottom bracket
Postby HLC » Wed Mar 13, 2013 6:46 pm
Why would you need to refit the sleeve?WestcoastPete wrote:Thanks RonK
I did look at them. I'd have to get this cup off the drive side of this sleeve and then refit the sleeve. I can't think of a better idea I guess.
Ta
- WestcoastPete
- Posts: 911
- Joined: Thu Mar 19, 2009 5:59 pm
- Location: Peoples Republic of Coburg, Victoria
Re: Unknown bottom bracket
Postby WestcoastPete » Wed Mar 13, 2013 9:00 pm
The shell without the sleeve has a big diameter, too big for the threadless BB. But, the sleeve is only 59mm wide, which will probably be too narrow, and it's also become apparent that without the drive side cup and its little notch on place, the sleeve will rotate.
No way out of it. I'll have to rebuild it as it is. For now, I'll persist with the existing crankset too. Anyone got a 106bcd three armed chainring around? The smaller the better...
Sent from my GT-I9100 using Tapatalk 2
No way out of it. I'll have to rebuild it as it is. For now, I'll persist with the existing crankset too. Anyone got a 106bcd three armed chainring around? The smaller the better...
Sent from my GT-I9100 using Tapatalk 2
-
- Posts: 3540
- Joined: Sat Dec 08, 2007 10:12 am
- Location: 3166
Re: Unknown bottom bracket
Postby kukamunga » Wed Mar 13, 2013 9:35 pm
If I didn't sell it at a recent swap meet, I might still have one of those bottom brackets in my collection I could sell you
Jump to
- General Australian Cycling Topics
- Info / announcements
- Buying a bike / parts
- General Cycling Discussion
- The Bike Shed
- Cycling Health
- Cycling Safety and Advocacy
- Women's Cycling
- Bike & Gear Reviews
- Cycling Trade
- Stolen Bikes
- Bicycle FAQs
- The Market Place
- Member to Member Bike and Gear Sales
- Want to Buy, Group Buy, Swap
- My Bikes or Gear Elsewhere
- Serious Biking
- Audax / Randonneuring
- Retro biking
- Commuting
- MTB
- Recumbents
- Fixed Gear/ Single Speed
- Track
- Electric Bicycles
- Cyclocross and Gravel Grinding
- Dragsters / Lowriders / Cruisers
- Children's Bikes
- Cargo Bikes and Utility Cycling
- Road Racing
- Road Biking
- Training
- Time Trial
- Triathlon
- International and National Tours and Events
- Cycle Touring
- Touring Australia
- Touring Overseas
- Touring Bikes and Equipment
- Australia
- Western Australia
- New South Wales
- Queensland
- South Australia
- Victoria
- ACT
- Tasmania
- Northern Territory
- Country & Regional
Who is online
Users browsing this forum: No registered users
- All times are UTC+10:00
- Top
- Delete cookies
About the Australian Cycling Forums
The Australian Cycling Forums is a welcoming community where you can ask questions and talk about the type of bikes and cycling topics you like.
Bicycles Network Australia
Forum Information
Connect with BNA
Brought to you by Bicycles Network Australia | © 1999 - 2024 | Powered by phpBB ®
This website uses affiliate links to retail platforms including ebay, amazon, proviz and ribble.
This website uses affiliate links to retail platforms including ebay, amazon, proviz and ribble.