Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Converting 3x8 road bike to 1x8

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.

Converting 3x8 road bike to 1x8

Old 09-17-13, 11:02 AM
  #1  
sitwell
Senior Member
Thread Starter
 
Join Date: Feb 2009
Location: Iowa City, IA
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Converting 3x8 road bike to 1x8

How difficult would this be to do? I pretty much always use the same chainring and 8 speeds would work fine for my purposes. It's just an around town/commuter bike. The bike in question is a Motobecane Mirage from Bikes Direct that I got a deal on a few months back from Bike Island.
http://www.bikesdirect.com/products/...FcxAMgodOHYAJw
Would I need a new chainring or a new BB? Just a project I was thinking about. I don't like having parts on my bike that I don't use. Any help is appreciated.
sitwell is offline  
Old 09-17-13, 11:28 AM
  #2  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,464

Bikes: 8

Mentioned: 183 Post(s)
Tagged: 0 Thread(s)
Quoted: 6718 Post(s)
Likes: 0
Liked 138 Times in 117 Posts
use just the middle chainring .. ignore, or remove the other 2.
fietsbob is offline  
Old 09-17-13, 11:38 AM
  #3  
gregjones 
Senior Member
 
gregjones's Avatar
 
Join Date: Aug 2012
Location: West Georgia
Posts: 2,827

Bikes: K2 Mod 5.0 Roadie, Fuji Commuter

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I took off the fd and left the triple front crankset on with the chain on the center gear. I had to limit the rd to the lower (big) four gears to keep the chain from rubbing on the large chainring.

On my bike, I ran it 1X8 with a single speed cranket and could run thru all eight gears with no trouble. My bottom bracket was 3mm short of the recommended spindle and it lined up dead in the center of the cassette.

I don't know if your bike has removable gears or not. A lot of inexpensive cranksets a riveted or something together, anyway they don't come apart. You will just have to try. You might have to run you choice of gear inside the crank arm to line up or maybe change parts.

Unless someone has worked on the same model bike as yours, with these questions in mind, it would be up to guess and trial.

Good luck. Whatever it takes it should be minimal and work fine in the end.
__________________
Current Bike Stages--Click PR Logo
PedalRoom
gregjones is offline  
Old 09-17-13, 11:51 AM
  #4  
wphamilton
Senior Member
 
wphamilton's Avatar
 
Join Date: Apr 2011
Location: Alpharetta, GA
Posts: 14,445

Bikes: Nashbar Road

Mentioned: 59 Post(s)
Tagged: 0 Thread(s)
Quoted: 2462 Post(s)
Liked 28 Times in 21 Posts
Going from a triple to single I needed a wider bottom bracket. But consider: you may want the outer chainring or a "bash ring" there to keep the chain from falling outside, or you may alternatively want a chain guide (or use the existing derailleur). So you might wind up not taking all that many parts off.
wphamilton is offline  
Old 09-17-13, 12:02 PM
  #5  
rms13
Senior Member
 
Join Date: Apr 2013
Location: SoCal
Posts: 6,525
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 273 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I was looking into this a while ago. What I found was to do it right you would at least need a chain guide up front ...or keep the front derailleur in place to keep the chain from falling off. Most of the good chain guides are $50+ so keeping the derailleur is cheaper and easier. All in all it seemed like a lot of work and money for something to shave a few ounces off the bike and make it simpler when you can just not shift and get the same effect. If you want a real simple clean bike look at a single speed/fixed gear
rms13 is offline  
Old 09-17-13, 12:09 PM
  #6  
surreal
Senior Member
 
surreal's Avatar
 
Join Date: Mar 2002
Location: NJ
Posts: 3,084
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by sitwell View Post
... I don't like having parts on my bike that I don't use. Any help is appreciated.
What exactly are you trying to accomplish? You can go 1x8, but be prepared to buy some new parts. At minimum, you'll need shorter chainring bolts or a bash guard. You may want some sort of chain-keeper or dog-fang to prevent derailment towards the inside of the bike. It's suggested that you get a rampless ring with deep teeth, like a Surly stainless ring. You'll likely need to remove some links from your chain. Of course, you'll be giving up some range, too. You might not use it often, but it's there just in case.

I understand that some folks want to keep things simple, but I question the simplicity of a plan that involves removing several parts, adding several other parts, and spending money on stuff that you don't need.
surreal is offline  
Old 09-17-13, 12:16 PM
  #7  
mprelaw
Senior Member
 
mprelaw's Avatar
 
Join Date: Dec 2011
Location: Cape Cod, Massachusetts
Posts: 2,318
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If it's just an around town/commuter ride, why worry about how it looks? Without knowing what you do, I would guess that you're either riding it in street clothes or carrying a change of clothes with you when commuting. A few extra grams, or aesthetics, don't seem to be worth the work involved. I'd just ride it as is, and not use the front shifter, but it's your bike, not mine.
mprelaw is offline  
Old 09-17-13, 12:23 PM
  #8  
sitwell
Senior Member
Thread Starter
 
Join Date: Feb 2009
Location: Iowa City, IA
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by surreal View Post
What exactly are you trying to accomplish? You can go 1x8, but be prepared to buy some new parts. At minimum, you'll need shorter chainring bolts or a bash guard. You may want some sort of chain-keeper or dog-fang to prevent derailment towards the inside of the bike. It's suggested that you get a rampless ring with deep teeth, like a Surly stainless ring. You'll likely need to remove some links from your chain. Of course, you'll be giving up some range, too. You might not use it often, but it's there just in case.

I understand that some folks want to keep things simple, but I question the simplicity of a plan that involves removing several parts, adding several other parts, and spending money on stuff that you don't need.
I understand what you're saying. I've ridden ss/fg for years and have some parts lying around. I moved from Chicago to Iowa City not too long ago and it's just hilly enough around here that I could use gears, but I don't need 24. I guess I still have that minimalist mentality though. I'll just try it out and see what happens. Worst case I put it back to how it is now. I'm not prepared to put a bunch of money into a $250 bike, but I don't mind doing some work on it.
sitwell is offline  
Old 09-17-13, 12:37 PM
  #9  
azgreg
Senior Member
 
azgreg's Avatar
 
Join Date: Dec 2012
Location: Phoenix, AZ
Posts: 305
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I'm with fietsbob, just remove the unwanted chainrings, shifter, and derailer and have at it.
azgreg is offline  
Old 09-17-13, 01:17 PM
  #10  
DiabloScott
It's MY mountain
 
DiabloScott's Avatar
 
Join Date: Sep 2006
Location: Mt.Diablo
Posts: 8,576

Bikes: Klein, Merckx, Trek

Mentioned: 57 Post(s)
Tagged: 0 Thread(s)
Quoted: 2155 Post(s)
Liked 17 Times in 9 Posts
Originally Posted by azgreg View Post
I'm with fietsbob, just remove the unwanted chainrings, shifter, and derailer and have at it.
The bash guard idea has some merit though - and the derailleur might be useful as a chain drop protector.

I grew up in Iowa City - I know those hillls... not long but some are kind of steep.
DiabloScott is offline  
Old 09-17-13, 01:29 PM
  #11  
sitwell
Senior Member
Thread Starter
 
Join Date: Feb 2009
Location: Iowa City, IA
Posts: 59
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by DiabloScott View Post
The bash guard idea has some merit though - and the derailleur might be useful as a chain drop protector.

I grew up in Iowa City - I know those hillls... not long but some are kind of steep.
If I was 24 instead of 34, it wouldn't be a problem on a ss. Not anymore though. Thank you to all who have chimed in. I'll report back when the project is done.
sitwell is offline  
Old 09-17-13, 04:31 PM
  #12  
ArizonaAdam
Senior Member
 
Join Date: Sep 2005
Location: Las Vegas, NV
Posts: 218

Bikes: '13 Felt Z5, '13 Giant Anthem 29er, '05 Specialized Sirrus, 2014 Stolen Saint 24

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I did this at one point on my hybrid/commuter because I wanted a rear fender and it would not fit with the fd on the bike. I took off the inner and outer rings, bought shorter chainring bolts, and took off the fd/cable.

I never had a problem with chain dropping, though my commute at the time was only 2 miles each way so I didn't ride much.

Realized I didn't need the fender and put everything back without issue.
ArizonaAdam is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.