Bike pedals won't thread in

[Lily2020]

Hi,

I bought a kids bike online and the pedals won't thread into the crank. It doesn't even fit in the hole. I've tried grease, adding pressure while threading and it just won't stay put.

 

[fossyant]

The pedals are either left threadded or right threadded - don't get that wrong or you'll damage the thread. Some kids bikes do have odd sizes, but assuming it's new the pedals should be correct.

 

[fossyant]

Should be a L or R on them. R goes on the side of the chain rings

 

[Sharky]

Not all threads are equal.
A google search brought up :-

Thread Sizes
Most pedals have 9/16" x 20 tpi threads. Pedals for one-piece cranks are 1/2" x 20 tpi. Older French bicycles used a 14 mm x 1.25 mm thread, but these are quite rare.

 

[raleighnut]

Not all threads are equal.
A google search brought up :-

Thread Sizes
Most pedals have 9/16" x 20 tpi threads. Pedals for one-piece cranks are 1/2" x 20 tpi. Older French bicycles used a 14 mm x 1.25 mm thread, but these are quite rare.

Yep but they look like 1/2 inch crankarms to me, my Trike has got the f£^%"£(g things on it .

 

[Cycleops]

You’ve got the wrong size pedals. Sounds like the thread of the supplied pedals is too small Or maybe too big. When they were packing your bike for dispatch someone threw in the wrong pedals. Ask them to supply the correct ones.

 

[Lily2020]

The pedals are either left threadded or right threadded - don't get that wrong or you'll damage the thread. Some kids bikes do have odd sizes, but assuming it's new the pedals should be correct.

Thank you, I did make sure that I was putting the correct pedals on, still won't fit. But thanks for looking!

 

[Sharky]

Which do you think is your issue?

Kids pedals (smaller thread) supplied with adult (larger thread cranks)
or Adult pedals with kids cranks?

See also:-

https://www.google.co.uk/search?sxs...CZIBAjIzmAEAoAEBqgEHZ3dzLXdpeg&sclient=psy-ab

To resolve quickly, I suggest a visit to your local bike shop and they will have both sizes in stock.

Good luck

 

[Ajax Bay]

Search: "childrens bike pedal thread"
The first image looks like a 'normal' pedal to me (ie 9/16ths). Very likely the crank requires a child's pedal (1/2") (which is why the pedal axle thread is 'too big' (diameter) for it.

 

[raleighnut]

Search: "childrens bike pedal thread"
The first image looks like a 'normal' pedal to me (ie 9/16ths). Very likely the crank requires a child's pedal (1/2") (which is why the pedal axle thread is 'too big' (diameter) for it.

They're not necessarily a 'childs' pedal, a lot of BMX bikes and American 'cruiser' bikes with the oversize 'inside out' bottom bracket and one piece crank use the smaller thread. My Trike is similarly afflicted by one of those cranks, I keep looking at getting an adapter to convert the BB to a normal one but they're £20 and then there is the crank to buy and I can't afford it at the moment.

 

[ianrauk]

I bought a kids BMX bike from Decathlon. It was delivered with adult pedals
A quick call to them and they sent a pair of kids ones that would fit.