cog too tight
#1
Junior Member
Thread Starter
Join Date: May 2009
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
cog too tight
So I bought a velocity deep v from a guy through craigslist and the wheel came with an 18t cog and lockring. I wanted to switch to my 16t cog and got the lockring off with ease, however the cog simply will not come off. So far I've tried using wd-40 which hasn't worked and I need suggestions on how to loosen this cog and reasons as to why it may be so tight.
#2
bank robber burger
Join Date: Jul 2008
Location: coloradical
Posts: 147
Bikes: fuji thrill mountain bike, caloi rat rod beach cruiser, fuji sports ten fixie
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
use the wheel and the chain to pull the cog off... sometimes chainwhips suck to pull off a cog. take the chain off the chainring and drape it over the bb.
put the rear wheel on and tighten the axle bolts so the wheel wont move out of the dropouts. put the chain on the cog and double it over itself until the chain doesnt spin and there is no slack between the cog and the bb. make sure you turn it the right direction to get the cog off. grab the tire and keep the bike stable and just turn the wheel like a steering wheel. the cog will spin off. you can also do this in the reverse process to put the new cog on...
https://fixedgearbikes.blogspot.com/2...-rotafixa.html
put the rear wheel on and tighten the axle bolts so the wheel wont move out of the dropouts. put the chain on the cog and double it over itself until the chain doesnt spin and there is no slack between the cog and the bb. make sure you turn it the right direction to get the cog off. grab the tire and keep the bike stable and just turn the wheel like a steering wheel. the cog will spin off. you can also do this in the reverse process to put the new cog on...
https://fixedgearbikes.blogspot.com/2...-rotafixa.html
#3
Junior Member
Thread Starter
Join Date: May 2009
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
use the wheel and the chain to pull the cog off... sometimes chainwhips suck to pull off a cog. take the chain off the chainring and drape it over the bb.
put the rear wheel on and tighten the axle bolts so the wheel wont move out of the dropouts. put the chain on the cog and double it over itself until the chain doesnt spin and there is no slack between the cog and the bb. make sure you turn it the right direction to get the cog off. grab the tire and keep the bike stable and just turn the wheel like a steering wheel. the cog will spin off. you can also do this in the reverse process to put the new cog on...
https://fixedgearbikes.blogspot.com/2...-rotafixa.html
put the rear wheel on and tighten the axle bolts so the wheel wont move out of the dropouts. put the chain on the cog and double it over itself until the chain doesnt spin and there is no slack between the cog and the bb. make sure you turn it the right direction to get the cog off. grab the tire and keep the bike stable and just turn the wheel like a steering wheel. the cog will spin off. you can also do this in the reverse process to put the new cog on...
https://fixedgearbikes.blogspot.com/2...-rotafixa.html
#4
Senior Member
Join Date: Sep 2008
Location: ottawa
Posts: 68
Bikes: 04 kona dawg matic, 08 kona paddy wagon
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
i wouldnt use wd40 on any bike part i own, its very corrosive. its so tight because when the other guy used it he probablly backpeadled alot instead of using breaks alot. since its a reverse thread, the backpeadling motion tightens the cog more. only way to get it off is to giv' 'er
#5
Junior Member
Thread Starter
Join Date: May 2009
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
i wouldnt use wd40 on any bike part i own, its very corrosive. its so tight because when the other guy used it he probablly backpeadled alot instead of using breaks alot. since its a reverse thread, the backpeadling motion tightens the cog more. only way to get it off is to giv' 'er
giv' 'er**********??
#6
Senior Member
Join Date: Jul 2006
Location: Columbus, OH
Posts: 11,375
Bikes: '08 Surly Cross-Check, 2011 Redline Conquest Pro, 2012 Spesh FSR Comp EVO, 2015 Trek Domane 6.2 disc
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Likes: 0
Liked 7 Times
in
6 Posts
If the reverse rotafix won't do it, there's any number of things the previous owner could have done that would cause problems: Loctite and JB-Weld are the first 2 which come to mind.
__________________
"I feel like my world was classier before I found cyclocross."
- Mandi M.
"I feel like my world was classier before I found cyclocross."
- Mandi M.
#7
Senior Member
Join Date: May 2008
Location: Davis/Lafayette, CA
Posts: 2,014
Bikes: too many
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
i wouldnt use wd40 on any bike part i own, its very corrosive. its so tight because when the other guy used it he probablly backpeadled alot instead of using breaks alot. since its a reverse thread, the backpeadling motion tightens the cog more. only way to get it off is to giv' 'er
oh, and don't do this like I did lulz
you can try applying heat with a torch if it seems really stuck. probably what i should have done
#8
Junior Member
Thread Starter
Join Date: May 2009
Posts: 12
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
lockrings are reverse threaded, not cogs. backpedaling causes the cog to come off, hence why riding brakless on suicide setups are, well, suicide.
oh, and don't do this like I did lulz
you can try applying heat with a torch if it seems really stuck. probably what i should have done
oh, and don't do this like I did lulz
you can try applying heat with a torch if it seems really stuck. probably what i should have done
#9
extra bitter
i wouldnt use wd40 on any bike part i own, its very corrosive. its so tight because when the other guy used it he probablly backpeadled alot instead of using breaks alot. since its a reverse thread, the backpeadling motion tightens the cog more. only way to get it off is to giv' 'er
Sorry to rail, but come on, seriously?
#10
Senior Member
Join Date: Jun 2008
Posts: 857
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#11
Bicycle Repair Man !!!
#12
bank robber burger
Join Date: Jul 2008
Location: coloradical
Posts: 147
Bikes: fuji thrill mountain bike, caloi rat rod beach cruiser, fuji sports ten fixie
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
i dont have the orig pdf. if you look at the orig pic on the top of the link i posted, you will see what i mean by doubling the chain over. on the bb it is simply just around the bb and pulled tight
#14
Member
Join Date: Feb 2009
Posts: 27
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
lockrings are reverse threaded, not cogs. backpedaling causes the cog to come off, hence why riding brakless on suicide setups are, well, suicide.
oh, and don't do this like I did lulz
you can try applying heat with a torch if it seems really stuck. probably what i should have done
oh, and don't do this like I did lulz
you can try applying heat with a torch if it seems really stuck. probably what i should have done
#15
Senior Member
Join Date: Sep 2008
Location: Minneapolis
Posts: 322
Bikes: old lotus
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
When this happened to me it was because there was no grease used when the cog was installed.
I went down to the LBS and they got it off for me with this
https://www.ride-this.com/index.php/p...t23t-cogs.html
and about a four foot length of steel pipe for leverage.
I went down to the LBS and they got it off for me with this
https://www.ride-this.com/index.php/p...t23t-cogs.html
and about a four foot length of steel pipe for leverage.
#16
Senior Member
Join Date: May 2008
Location: Davis/Lafayette, CA
Posts: 2,014
Bikes: too many
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
hub came shipped with cog installed. i laced it up halfway to get leverage to take it off (couldn't lace full since the cog was in the way of the spoke holes). was cranking on it, didn't notice the movement i was getting was the hub shell flexing instead of getting actual rotation. next thing *clink* and i get this.
#18
abides and rides
Join Date: Feb 2007
Posts: 471
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
My last seized cog was an absolute mofugga and nothing worked. I ended up clamping the cog down in a vice to get it off. Trashed the cog, but got it off in the end.
#19
Senior Member
Join Date: Jun 2005
Posts: 218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Put the back wheel against a wall, have somebody hold you up, and put your weight on the pedal in the reverse direction. Can also be used to tighten cogs in a pinch.
#20
bike
Join Date: Sep 2006
Posts: 379
Bikes: https://velospace.org/node/5653
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts