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 09-05-06, 12:34 PM   #1
marmer
Junior Member
Thread Starter
 
Join Date: Sep 2006
Bikes:
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Is it possible to replace a 3-speed with 7 or 8 speed internal hub?

Planning on getting a bike (Cadillac L-3) that only comes with a Nexus Inter-3/roller brake. Would like to upgrade to a 7 or 8 speed internal hub. Haven't seen the bike yet to measure, but I fear that the frame might not be the requisite ?130mm? , and it's an aluminum frame, hence no cold setting. Assuming the frame is wide enough, is this possible? If not, what are my options? 7 sp derailleur?

Thanks,
Marty
marmer is offline   Reply With Quote
Old 09-05-06, 06:16 PM   #2
marcusbandito
Senior Member
 
marcusbandito's Avatar
 
Join Date: Mar 2005
Location: Ann Arbor
Bikes: Voodoo Wanga, Waterford RS, Gitane SS
Posts: 275
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If the bike has an internallly geared hub it most likely does not have a derailleur hanger on the frame, so that would not be an option. If the frame is spaced right, you would just have to get the new 7speed hub and have a wheels built up around it. Any bike shop sould be able to take care of that for you.
marcusbandito is offline   Reply With Quote
Old 09-05-06, 06:56 PM   #3
Lurch
Fossil
 
Lurch's Avatar
 
Join Date: Nov 2004
Location: Raleigh, NC
Bikes: Bianchi Bergamo, Raleigh Misceo
Posts: 331
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My '68 Hercules with S-A 3-speed is about 125mm between the dropouts. That's narrower than the 7 and 8-speed Nexus hubs.
Lurch is offline   Reply With Quote
Old 09-06-06, 04:41 AM   #4
Retro Grouch 
Senior Member
 
Retro Grouch's Avatar
 
Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
Posts: 26,543
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
Doesn't look like it's going to work to me. I just looked them up in my QBP catalogue. It says the 3-speed Nexus is 120mm over locknut and the 7-speed is either 127 or 130.

If you don't have the bike yet, why don't you just look around for one that's equipped the way you want?
Retro Grouch is offline   Reply With Quote
Old 09-06-06, 09:35 AM   #5
Dan Burkhart 
Senior member
 
Dan Burkhart's Avatar
 
Join Date: Oct 2004
Location: Oakville Ontario
Bikes:
Posts: 5,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Quote:
Originally Posted by marmer
Planning on getting a bike (Cadillac L-3) that only comes with a Nexus Inter-3/roller brake. Would like to upgrade to a 7 or 8 speed internal hub. Haven't seen the bike yet to measure, but I fear that the frame might not be the requisite ?130mm? , and it's an aluminum frame, hence no cold setting. Assuming the frame is wide enough, is this possible? If not, what are my options? 7 sp derailleur?

Thanks,
Marty
Your options are limited with this bike. Not only is the dropout spacing too narrow to accomodate a 7 or 8 speed hub(of any make), but it has rear facing dropouts making use of a derailleur difficult or impossible even with an adaptor bracket. Futhermore, only an older road type derailleur hub would be narrow enough to fit.
On to the next problem which is brakes. This frame has no bosses for cantis or V brakes, so your only option there would be a side pull caliper. Not impossible to do, but not a great option.
All in all, if you need more gears and you really want a pedal forward bike, I think the Townie 8 would be a better choice for you.
By the way, this is not a sales pitch as I sell Cadillac but not Electra.(See my response to your other post in the General Discussion Forum.)
Dan Burkhart
www.boomerbicycle.ca
Dan Burkhart is offline   Reply With Quote
Old 09-06-06, 06:14 PM   #6
jordanb
Senior Member
 
Join Date: May 2006
Location: Chicago IL
Bikes: Schwinn Racer (3-speed 1970), DaHon (1984 "Hon") folder, Bianchi Milano
Posts: 176
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sturmey Archer/Sun Race 8 speed hubs are very narrow. They'll fit between drops designed for any other S-A hub.
jordanb is offline   Reply With Quote
Old 09-06-06, 07:24 PM   #7
Dan Burkhart 
Senior member
 
Dan Burkhart's Avatar
 
Join Date: Oct 2004
Location: Oakville Ontario
Bikes:
Posts: 5,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Quote:
Originally Posted by jordanb
Sturmey Archer/Sun Race 8 speed hubs are very narrow. They'll fit between drops designed for any other S-A hub.

Nope. sorry, that is incorrect. I have bikes with S-A 8 speed with drum brakes, and they are almost exactly the same width as a Nexus 8 with roller brake (About 132mm).According to Sturmey Archer's web site, the model with no brake is 124mm.
Dan Burkhart
www.boomerbicycle.ca
Dan Burkhart is offline   Reply With Quote
Old 09-06-06, 08:20 PM   #8
jordanb
Senior Member
 
Join Date: May 2006
Location: Chicago IL
Bikes: Schwinn Racer (3-speed 1970), DaHon (1984 "Hon") folder, Bianchi Milano
Posts: 176
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm not sure what model you have but according to Sheldon Brown the X-RF8 will fit as narrow as 118mm drops:

http://sheldonbrown.com/harris/sturmey-archer-hubs.html
jordanb is offline   Reply With Quote
Old 09-06-06, 08:30 PM   #9
Dan Burkhart 
Senior member
 
Dan Burkhart's Avatar
 
Join Date: Oct 2004
Location: Oakville Ontario
Bikes:
Posts: 5,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Quote:
Originally Posted by jordanb
I'm not sure what model you have but according to Sheldon Brown the X-RF8 will fit as narrow as 118mm drops:

http://sheldonbrown.com/harris/sturmey-archer-hubs.html
Well, I certainly would not presume to argue with Sheldon on this, and I suppose it would be reasonable to use thinner lock nuts, but even so, I am pretty sure only the brakeless version could be narrowed down to 120mm.
Dan
Dan Burkhart is offline   Reply With Quote
Old 09-06-06, 08:40 PM   #10
reverborama
Broom Wagon Fodder
 
reverborama's Avatar
 
Join Date: Jul 2006
Location: Minnesota
Bikes: Fuji Supreme; Kona Wo; Nashbar road frame custom build; Schwinn Varsity; Nishiki International; Schwinn Premis, Falcon Merckx
Posts: 1,231
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
This summer I saw a rod-braked Raleigh that had a 7-speed Shimano hub in it. He installed it when the original hub failed and said it made the bike WAY more rideable. And it didn't look horribly out of place. Of course I expect there will be some people spitting on him at the All British show this weekend...
reverborama is offline   Reply With Quote
Old 09-07-06, 06:09 AM   #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: 28,776
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Quote:
Originally Posted by reverborama
This summer I saw a rod-braked Raleigh that had a 7-speed Shimano hub in it. He installed it when the original hub failed and said it made the bike WAY more rideable. And it didn't look horribly out of place. Of course I expect there will be some people spitting on him at the All British show this weekend...
If the Raleigh was a steel frame (and at that vintage, it couldn't be anything else) it could have been cold set to take the wider hub. The OP's Al frams can't be.
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 11:55 AM.