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


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-25-07, 07:33 PM   #1
anomaly
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SF
Bikes: 1972 Paramount Track, 1972 Paramount P13 Road, 1972 Paramount Tandem, 1986 Paramount Road, Merckx MXL, Gunnar Cross Hairs, Samson Illusion NJS, KHS Aero Track, Titus Racer X 29er, Tom Palermo Custom Touring
Posts: 1,572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
So my conversion didn't go over so well =/

I converted a Jamis Aurora cyclocross the other day using some parts I had laying around, and it went pretty piss poor. I was hoping that 40/16 would be a magic gear, given that is what I had on hand and it has vertical dropouts, but I didn't have such luck. The chain can be knocked off by tilting the bike over rapidly. I believe a half-link will work, so I am going to give that a shot. If that doesn't work going up a tooth in the front should put it where it needs to be, then once the chain stretches I would go to a 17 in the rear. In addition the 175 crank arms + toe clips give quite a bit of overlap for the front wheel. It's a shame, the bike rides like a dream otherwise. I might put the Sora group back on the Jamis and sell it, and put the SS stuff on a Pista frame that is too big for me and sell that, then pick up a group buy Iro frame and build it up. Decisions decisions...
anomaly is offline   Reply With Quote
Old 04-25-07, 07:36 PM   #2
goldener
Banned.
 
Join Date: Jan 2006
Bikes:
Posts: 658
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yea, guessing on magic gear ratios usually doesn't turn out that great....
goldener is offline   Reply With Quote
Old 04-25-07, 08:13 PM   #3
anomaly
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SF
Bikes: 1972 Paramount Track, 1972 Paramount P13 Road, 1972 Paramount Tandem, 1986 Paramount Road, Merckx MXL, Gunnar Cross Hairs, Samson Illusion NJS, KHS Aero Track, Titus Racer X 29er, Tom Palermo Custom Touring
Posts: 1,572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Oh well, I tried and learned my lesson. My big decision is how much money I want to put into this versus something else.
anomaly is offline   Reply With Quote
Old 04-25-07, 08:16 PM   #4
killsurfcity
perspective distorts
 
killsurfcity's Avatar
 
Join Date: Aug 2005
Location: 25th and Girard
Bikes:
Posts: 1,345
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
how far off were you? could a half-link in the chain sort that out?
killsurfcity is offline   Reply With Quote
Old 04-25-07, 08:31 PM   #5
noriel
Honking drivers see you
 
noriel's Avatar
 
Join Date: Nov 2004
Location: Houston, TX
Bikes: Fuji Track, KHS Witch Doctor, Balance AL 750, Tank Mod Trials Bike
Posts: 377
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You're better off starting on an easier frame, like a track frame or a cyclocross fram with track ends or horizontal dropouts. Leave the Jamis alone. I'd rather have two good fixed gear bikes, instead of 4 so-so builds that may never really be finished.
noriel is offline   Reply With Quote
Old 04-25-07, 08:37 PM   #6
dustinlikewhat
Bow$$
 
dustinlikewhat's Avatar
 
Join Date: Dec 2004
Location: Bodymore, Murderland
Bikes: Surly Instigator '02, Schwinn Traveler fixed conversion, '02 Fuji Track
Posts: 2,013
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
wait was this fixed or single speed? if single speed just get a tensioner.
dustinlikewhat is offline   Reply With Quote
Old 04-25-07, 08:42 PM   #7
anomaly
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SF
Bikes: 1972 Paramount Track, 1972 Paramount P13 Road, 1972 Paramount Tandem, 1986 Paramount Road, Merckx MXL, Gunnar Cross Hairs, Samson Illusion NJS, KHS Aero Track, Titus Racer X 29er, Tom Palermo Custom Touring
Posts: 1,572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by dustinlikewhat
wait was this fixed or single speed? if single speed just get a tensioner.
I would like to run both, and it def isn't worth $150 for an Eno hub
anomaly is offline   Reply With Quote
Old 04-25-07, 08:45 PM   #8
dustinlikewhat
Bow$$
 
dustinlikewhat's Avatar
 
Join Date: Dec 2004
Location: Bodymore, Murderland
Bikes: Surly Instigator '02, Schwinn Traveler fixed conversion, '02 Fuji Track
Posts: 2,013
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
if it's a great fitting/riding frame, it is. or just slap the gears back on it and save up for a frame with track ends.
dustinlikewhat is offline   Reply With Quote
Old 04-25-07, 09:26 PM   #9
odie91
Senior Member
 
Join Date: Sep 2006
Bikes:
Posts: 223
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bad idea on the chain stretch. Although it compensates for the distance between front chainring and rear sprocket, the distance between teeth on a gear is constant. Riding a stretched chain will wear out your teeth really fast.

Quote:
Originally Posted by anomaly
If that doesn't work going up a tooth in the front should put it where it needs to be, then once the chain stretches I would go to a 17 in the rear. .
odie91 is offline   Reply With Quote
Old 04-25-07, 09:37 PM   #10
jjvw
MFA
 
jjvw's Avatar
 
Join Date: Apr 2006
Location: Denver
Bikes: 1973 Italvega Nouvo Record; 1965 Hercules; 1982-83 Schwinn Mystery MTB
Posts: 1,186
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Waiting for your chain to stretch to move up a gear is a bad idea.
jjvw is offline   Reply With Quote
Old 04-26-07, 06:07 AM   #11
anomaly
Senior Member
Thread Starter
 
Join Date: Mar 2007
Location: SF
Bikes: 1972 Paramount Track, 1972 Paramount P13 Road, 1972 Paramount Tandem, 1986 Paramount Road, Merckx MXL, Gunnar Cross Hairs, Samson Illusion NJS, KHS Aero Track, Titus Racer X 29er, Tom Palermo Custom Touring
Posts: 1,572
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Good to know, then where exactly does a chain 'stretch' if the distances remain constant?
anomaly is offline   Reply With Quote
Old 04-26-07, 08:17 AM   #12
idcruiserman
Mmmmm potatoes
 
idcruiserman's Avatar
 
Join Date: Sep 2006
Location: Idaho
Bikes:
Posts: 1,921
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Pin wear.
idcruiserman is offline   Reply With Quote
Old 04-26-07, 08:29 AM   #13
oldsprinter
oldsprinter
 
oldsprinter's Avatar
 
Join Date: Nov 2006
Location: Tokyo
Bikes:
Posts: 935
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Get a 1/4 link for now
oldsprinter is offline   Reply With Quote
Old 04-26-07, 03:50 PM   #14
noriel
Honking drivers see you
 
noriel's Avatar
 
Join Date: Nov 2004
Location: Houston, TX
Bikes: Fuji Track, KHS Witch Doctor, Balance AL 750, Tank Mod Trials Bike
Posts: 377
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I had an ss mtb conversion and the chain tension was so tight that it wore out the drive-side races on my rear hub. It was a bike that I had a "magic-gear" figured out.
noriel is offline   Reply With Quote
Old 04-26-07, 03:50 PM   #15
goldener
Banned.
 
Join Date: Jan 2006
Bikes:
Posts: 658
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by idcruiserman
Pin wear.
roller/bushing wear
goldener is offline   Reply With Quote
Old 04-26-07, 05:01 PM   #16
squeakywheel
domestique
 
squeakywheel's Avatar
 
Join Date: Nov 2005
Location: off the back
Bikes:
Posts: 2,004
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Adding a tooth will move the rear axle forward 1/8 inch.

Adding a half link will move the rear axle backwards 1/4 inch.

Adding a full link will move the rear axle backwards 1/2 inch.

Measure your error with what you have now and then figure out which combination of adding / removing any of these three will put the axle in the dropouts.
squeakywheel 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 12:56 PM.