Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Alt Bike Culture Chopped, dropped, stretched, lifted, and otherwise cut up and put back together. The art and science of choppers, cruisers, lowriders and the vast world of mutant bicycles.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-18-11, 09:29 AM   #1
JLTinsley
Junior Member
Thread Starter
 
JLTinsley's Avatar
 
Join Date: Aug 2011
Location: Misery, Missouri
Bikes:
Posts: 23
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Help with disc brake conversion?

I'm not sure if this is the right forum for my question but tried my best guess!

So I want to convert this bike, which currently is a single speed with a coaster brake, to a bike with an internal gear hub (7 or 8 speed) and disc brakes. Here are the specs:

Frame: HandCrafted 4130 Chromoly Steel and 1x H2O boss, Rear rack mounts, rear fender mounts
Fork: Dura Forte Chromoly Unicrown with Fender Mounts, 1" threaded steerer
Stem: Aluminum alloy Threaded, 1" quill
Handlebar: Aluminum alloy Comfort Swept-back
Derailleurs: n/a
Shifters: n/a
Brakes: Rear Coaster Brake (pedal backwards for braking)
Hubs Front: Aluminum ALLOY SILVER NUTTED
R/HUB: SHIMANO COASTER CBE110
Rims: DA17, Aluminum ALLOY SILVER, 700c with 36 holes
14G STAINLESS Spokes W/BRASS NIPPLES
Crank LSC 44T Chainring, 170MM Aluminum ALLOY SILVER Arms
Cartridge Bearing Bottom bracket
Tires: Kenda 700x32C BLACK wall

And because pictures sometimes help:



My question is, what all will I need to do to convert this bike to disc brakes? I could deal with just the front being disc and the back being either a drum brake or rim, if the rear conversion would prove really difficult/expensive, but would prefer both front and back being disc.

What I think I know so far is: For the front, I will need a disc compatible fork (with a 1" threaded steerer??), disc compatible hub, and of course, the brake components themselves. However, I don't think 1" threaded steerer forks for disc exist (I can't find any, anyway) so what would I need to do to make this work? But a new stem, headset, what size, etc?

For the back, I thought I just needed a disc compatible hub (I was going to get the Sturmey Archer internal 8 speed) and the brake system. However, seeing something on the interwebz made me think I might need disc brake tabs on the rear dropouts/seat-stay/chain-stay intersection too. Is that true? Will it even be possible to use disc brakes on the back without being exorbitantly expensive? If it would be a huge hassle and cost me an arm and a leg, I'll just do a drum or rim brake in the back...so how would I convert from a coaster brake to that?

Thank you all for your help!
JLTinsley is offline   Reply With Quote
Old 08-18-11, 09:47 AM   #2
lz4005
coasterbrakelockup
 
lz4005's Avatar
 
Join Date: Nov 2004
Location: parts unknown
Bikes: surly steamroller w/coaster brake, electra single speed cruiser, specialized rockhopper commuter, no-name single speed folder, 700c ultimate wheel, 24" unicycle, specialized bmx lsd, single seat single speed huffy tandem, pink upsidedown parade bike
Posts: 825
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The folks in the mechanics forum might have better answers for you. They'd probably know if the fork you need is available.

You're right about the rear brake. To convert to disc you'll have to have a tab welded to the frame near the rear dropout, which is a pretty precise bit of work and will end up requiring some repainting afterwards.
lz4005 is offline   Reply With Quote
Old 08-20-11, 08:33 PM   #3
jsavage451
Junior Member
 
jsavage451's Avatar
 
Join Date: Jul 2011
Location: Ventura, CA
Bikes: Giovani/ Colnago something weird, early 80's Centurion Super LeMans Single gear conversion, Novara Strada, 73 Schwinn Bantam and a garage full of projects and rebuilds
Posts: 22
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
sturmey archer is not going to have a disc brake hub, nor will you probably find 1" threaded forks with disc brake mounts, you could try 1" threadless forks but they will most likely be suspension. is there a good reason you would like disc brakes? a bike like that should never need them. if its a quality thing, good rim brakes will be just as good. also, i'm making a guess here but i think a disc brake on the front without suspension forks will throw you end over!
jsavage451 is offline   Reply With Quote
Old 08-20-11, 11:01 PM   #4
JLTinsley
Junior Member
Thread Starter
 
JLTinsley's Avatar
 
Join Date: Aug 2011
Location: Misery, Missouri
Bikes:
Posts: 23
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sturmey Archer does have a disc compatible hub- their 8 speed IGH. I've changed my mind about the project and will not be adding disc brakes. I was going to convert this bike to electric, hence why I wanted powerful disc brakes, but have since decided this is not the bike I'm going to convert as it would take too much modding.
JLTinsley is offline   Reply With Quote
Old 08-24-11, 12:43 AM   #5
jsavage451
Junior Member
 
jsavage451's Avatar
 
Join Date: Jul 2011
Location: Ventura, CA
Bikes: Giovani/ Colnago something weird, early 80's Centurion Super LeMans Single gear conversion, Novara Strada, 73 Schwinn Bantam and a garage full of projects and rebuilds
Posts: 22
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
well kudos on finding that, i did not think sturmey archer would ever do that, good luck on your conversion!
jsavage451 is offline   Reply With Quote
Old 08-24-11, 10:49 AM   #6
Dan Burkhart 
Senior member
 
Dan Burkhart's Avatar
 
Join Date: Oct 2004
Location: Oakville Ontario
Bikes:
Posts: 6,056
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Quote:
Originally Posted by jsavage451 View Post
well kudos on finding that, i did not think sturmey archer would ever do that, good luck on your conversion!
Sturmey Archer also offers disc brake 3 and 5 speed hubs.
http://www.sturmey-archer.com/products/hubs/cid/4/id/60
http://www.sturmey-archer.com/products/hubs/cid/4/id/60
Although the 3 speed is for extra wide dropouts (170mm)
To the OP, drum brakes would be a much better option for that bike. No frame modification required.
__________________
Gearhubs demystified and other cool stuff.


WANTED: Dead or broken gearhubs for failure analysis.

Like the shop
Dan Burkhart 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 08:52 PM.