New crankset

[Fearless Greg Lemond]

My old crankset, SRAM Truvativ Firex 1.1 [I think], is done for. Somehow the left pedal keeps 'falling' of.

So I need a new one. I have been looking for the same but with no result. Yes, I can buy the 150$ 3.3 new version of the Firex but that is beyond my budget now.

What are the points I need to look at? Can I for instance mount a cheaper Shimano octalink on it? That would save me about 100$

Thanks in advance.

 

[FitSsikS]

Not directly related to this post but....

Hmm...whenever a friend asks me for help regarding a pedal/attachment problem it's always the left one.

I wonder why?

Nyuk nyuk.

 

[winkybiker]

Not directly related to this post but....

Hmm...whenever a friend asks me for help regarding a pedal/attachment problem it's always the left one.

I wonder why?

Nyuk nyuk.

Yeah it is always the left one, eh? I can never get the pedal thread to start screwing in; so I just drill out the crank arm thread and glue the pedal in with epoxy.

 

[Ruby60]

You might be able to repair the crank arm by drilling out the hole and installing a HELICOIL. I don't know for sure if there is a lefthand threaded helicoil, but you can do a search and find out...

 

[avanti]

You might be able to repair the crank arm by drilling out the hole and installing a HELICOIL. I don't know for sure if there is a lefthand threaded helicoil, but you can do a search and find out...

There are left handed threaded inserts - I've used them in aerospace applications. But a specific drill size and a left handed tap are required for the installation. It may be lower cost just to buy a new crankset. I buy items like that from the McMaster Car catalog.

However drilling and tapping the crank to a new diameter will reduce the amount of material around the insert and thus increase stresses leading to a possible unsafe condition.

 

[winkybiker]

You might be able to repair the crank arm by drilling out the hole and installing a HELICOIL. I don't know for sure if there is a lefthand threaded helicoil, but you can do a search and find out...

Errr. I should have added one of these . Oh wait. You were answering the OP?

 

[JayKosta]

If the threads in the arm are still ok (not too sloppy or worn), then the pedal should be able to be tighten adequately. Maybe use anti-sieze on the pedal threads instend of grease. Or maybe the bearings in the pedal are bad and are causing the pedal axle to unscrew.

Jay Kosta
Endwell NY USA