Yes.

I mean, ****, he's Chuck Norris.

Am not sure what was used to secure that cog but if you are dealing with thread lockers penetrating fluids will do jack squat.

Blue Locktite requires extra mechanical force while red Loctite requires the use of a torch of it has been used properly and even then can make for some difficult removal.

https://jastein.com/Html/Unfixie.htm


heat
cog/freewheel vise

Did the OP try rotafix yet?

Unless your threads are seriously messed up, or the metals have fused (tbh unlikely either way), rotafix is the way to go. Has worked great on all the wheels I've built.

Please don't use heat, you will ruin the hub.

get some good torque and slow down. Breaker bar.

Try rotofix, But go slow. dont put all the pressure at once.

If you feel the threads bite add some triflow.

work slow. work slow. when its off. toss that shizz

negative.

heat the cog, not the hub with a heat gun.

Exactly. No one is talking about subjecting the hub to a nuclear warhead.

If you heat the cog you will heat the hub too. The threads will be weakened severely. Heat should never be used for this purpose unless you don't want to save the parts.

What do I know, I'm only a bicycle mechanic.

Hit it withthe oxy-acetylene torch and FEED in that oxy!

Regarding the use of heat to loosen a steel threaded cog on an aluminum hub:

1) The coefficient of thermal expansion of aluminum is approximately twice that of steel.

2) Both the hub and cog will expand radially outward when heated.

3) The good heat transfer properties of aluminum will ensure that the heat applied to the cog will transfer to the hub.

4) Therefore, the hub will expand more than the cog, the cog will become tighter on the hub, and this technique will be ineffective.

5) Brother 65er's recommendation to use heat in post #27 was made in the context of breaking down a red threadlocker compound, and not as a method to loosen a tight cog.

6) IME the most effective method is to use some sort of impact technique such as in post #6.

The thing you fail to account for in number 4 is that once the Al hub cools it'll shrink twice as much as the steel one and may be looser after a few heat cycles. This is exactly the reason why lightbulbs sometimes get loose in light fixtures and why Al an Cu wires connected with wire connectors not listed for Al/Cu will get loose as well -causing a fire possibly because of a loose connection.

Heat cycling MIGHT work to help loosen it up -but probably not until after it cools or goes through a few heat cycles. It might also work to break up some threadlock that was put in there too.

I'm lighting my bikes on fire right now.

break out the marshmallows!

how much heat?
are you an engineer?
I have a 10 year old Phil wood hub still going strong after getting the cog off in this manner.

C'mon, dude. You're just saying that.

it's fact. no foolin'!

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I'm surprised this thread is still going. I do appreciate everyone's advice and tips although I've already gotten the cog off a few days ago and have posted so somewhere on page 1. Basically, I used the rotafix method continuously once every 30 mins until the cog finally loosened.

Right on, Thirteen.

We just like to hang around after the party's over and and bicker over who get's the last beer.