Idiot ... damaged new bike crank thread day 1.

[Mikebike83]

Hi all. Bought a Scott bike today, sooo excited.
being a complete idiot, I didn’t know the left pedal went on backwards, and I have ruined the thread.

i am having a hell of a hard time finding just the left arm part
shimano Deore fc mt500 b2 175mm

i am at the point where I will take the next closest thing......

does anyone have any ideas what to get, I get easily confused by all the digits and numbers.

i get it’s a 175mm arm, so can I just buy any shimano 175mm arm?

any amazon uk links or eBay uk would be amazing help.

im so miffed, new bike, can’t even ride it ((

 

[vickster]

Can the bike shop you bought the bike from help? Or any bike shop?
Or given you were fitting the pedals yourself, online purchase?

 

[vickster]

Don’t use eBay or Amazon, try a proper bike shop
SJS are an Aladdins cave of bike parts. Phone them
https://www.sjscycles.co.uk/cranks-left/
SJSCycles Mail Order sales office - 01278 441500

 

[Oldfentiger]

How damaged is the thread?
If you have only mullered the thread lead-in, it could probably be rescued by running the correct tap through it. I have one - where are you?

 

[Darius_Jedburgh]

Running the pedal through from the back might clear the thread. It is still LH thread.

 

[Ajax Bay]

Try what Darius has suggested first. But any Hollowtech II crank will fit (temp. put up with 172.5) - and that will allow you to ride your new bike. The aesthetics can be addressed in slower time.

 

[Mikebike83]

thanks all.
I spent all night trying to find a part, impossible. Managed to source ultegra part, but didn’t have sufficient curve and kept hitting rear frame. Last resort, I screwed pedal in backwards to try and recut thread, and then put it on from the front.....mega tight. Seems ok. Hopefully won’t fall off and injure me.

have ordered new crank set just in case, but up and running !

 

[tyred]

Just keep an eye to make sure it doesn't come loose. If it does it will allow movement and fretting and that is when you really will wreck the thread.

If it tightened up correctly in the first place I'd expect you'll have no more trouble with it.

A helicoil is another option to repair it if does give problems.

 

[wafter]

I feel your pain. Glad you got it at least workably-sorted

 

[DRM]

Why not by the suitable tap and recut the thread? It’ll be cheaper then a crankset

 

[Paulus]

As you have successfully fitted the pedal, you could take it off again and apply some threadlock to the spindle and refit. This would help to stop it coming loose at some point in the future. Not a permanent fix but a good stop gap.