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 09-18-06, 10:10 AM   #1
mwrobe1
Code Warrior
Thread Starter
 
mwrobe1's Avatar
 
Join Date: Jul 2006
Location: South suburbs of Chicago, Illinois
Bikes: Schwinn MTB/Raleigh Marathon
Posts: 620
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Chainring question

OK...don't laugh at my DS MTB...I'm going to upgrade to a better ride when funds become available; but question...based on the below pic:



Do I assume correctly that if I ever have the need to replace the largest chainring that I am SOL? I'd like to keep this bike around as a "beater" in the future/and or something my wife can tool around with when she gets the motivation. I'm always in the largest cog in front and in the smallest three cogs in the rear.

If I would be SOL...what could I plan on spending to upgrade the spider/chainrings to something more "standard" (i.e. something that will take 4 or 5 bolt chainrings? I know, I know...don't tell me its not worth doing...but I'm a sentimental guy OK...)

I'm probably asking this question incorrectly...pardon the noobness.
__________________
Elwood: It's 106 miles to Chicago, we got a full tank of gas, 1/2 a pack of cigarettes, it's dark and we're wearing sunglasses.

Jake: Hit it.



Last edited by mwrobe1; 09-18-06 at 10:21 AM.
mwrobe1 is offline   Reply With Quote
Old 09-18-06, 10:48 AM   #2
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Save your money for a new bike. If your wife is interested in riding get her a bike as good as yours.

Al
Al1943 is offline   Reply With Quote
Old 09-18-06, 11:23 AM   #3
tomacropod
ot.net slave
 
Join Date: Feb 2006
Location: Canberra, Australia
Bikes: Salsa mtb * 3, Intense mtb * 1, Abeni SS rd * 1, Salsa road/touring * 2, Trek Damn one * 1, Vintage/projects * many
Posts: 571
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm pretty sure you can't replace the chainrings on those things. Pretty common OEM design. Do a quick ebay search and you should come up with heaps of lightly used or take-off 4-bolt cranksets with replaceable rings which would be suitable replacements. Shimano alivio and deore are good value.

- Joel
tomacropod is offline   Reply With Quote
Old 09-18-06, 12:25 PM   #4
mwrobe1
Code Warrior
Thread Starter
 
mwrobe1's Avatar
 
Join Date: Jul 2006
Location: South suburbs of Chicago, Illinois
Bikes: Schwinn MTB/Raleigh Marathon
Posts: 620
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by tomacropod
I'm pretty sure you can't replace the chainrings on those things. Pretty common OEM design. Do a quick ebay search and you should come up with heaps of lightly used or take-off 4-bolt cranksets with replaceable rings which would be suitable replacements. Shimano alivio and deore are good value.
I'll count'em when I get home...but I'm pretty sure thats a 44/30 something/20 something...another stupid question...if I was to go 46/30 something/20 something I'd need I longer chain right?

Also, I could be %99 certain that the crank is a square spindle type right?
__________________
Elwood: It's 106 miles to Chicago, we got a full tank of gas, 1/2 a pack of cigarettes, it's dark and we're wearing sunglasses.

Jake: Hit it.


mwrobe1 is offline   Reply With Quote
Old 09-18-06, 06:17 PM   #5
tomacropod
ot.net slave
 
Join Date: Feb 2006
Location: Canberra, Australia
Bikes: Salsa mtb * 3, Intense mtb * 1, Abeni SS rd * 1, Salsa road/touring * 2, Trek Damn one * 1, Vintage/projects * many
Posts: 571
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yes it's a JIS (standard japanese type) square taper BB spindle. The big ring is probably a 44, then 32/34 and 22/24. If you were to go to a 46t big ring you may not need a longer chain. It depends on whether your current chain was cut a half link long or a half link short.

an increase of 2 teeth on the chainring means an increase of a half-link (one tooth) of slack taken up at any given time (as the chain only contacts about half the chainring at once) which is a half inch.

- Joel
tomacropod is offline   Reply With Quote
Old 09-18-06, 06:48 PM   #6
mwrobe1
Code Warrior
Thread Starter
 
mwrobe1's Avatar
 
Join Date: Jul 2006
Location: South suburbs of Chicago, Illinois
Bikes: Schwinn MTB/Raleigh Marathon
Posts: 620
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by tomacropod
yes it's a JIS (standard japanese type) square taper BB spindle. The big ring is probably a 44, then 32/34 and 22/24. If you were to go to a 46t big ring you may not need a longer chain. It depends on whether your current chain was cut a half link long or a half link short.

an increase of 2 teeth on the chainring means an increase of a half-link (one tooth) of slack taken up at any given time (as the chain only contacts about half the chainring at once) which is a half inch.

- Joel

Thank you for your response!
__________________
Elwood: It's 106 miles to Chicago, we got a full tank of gas, 1/2 a pack of cigarettes, it's dark and we're wearing sunglasses.

Jake: Hit it.


mwrobe1 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 08:16 AM.