BMX-size pedal arms?

TOP GUN™ ANDY ⚔ (LSLB) ⚔ /

I found out last night that my Grande came with pedal arms with two different size threadings on them. One side was the standard 9/16" crank size, and the other was 1/2" BMX size. I've never seen the 1/2 size before!

Did those come standard on any bikes? I'd really love to find another one (left side) so I can run these incredibly ugly Primo BMX pedals I have kicking around

Re: BMX-size pedal arms?

Can you just drill the pedal arm out to 9/16

Re: BMX-size pedal arms?

TOP GUN™ ANDY ⚔ (LSLB) ⚔ /

I could do a lot of things, but I WANT to use 1/2 so I can use these dumbo pedals.

If I didn't want to use the pedals I'd just buy new crank arms and be done with it

Re: BMX-size pedal arms?

I guess I dont understand what is going on? You have two different pedals and crank arms?

Re: BMX-size pedal arms?

TOP GUN™ ANDY ⚔ (LSLB) ⚔ /

There are two pedal crank arms on this bike. One is 9/16, one is 1/2. I'd like another 1/2 sized one so they match, but all I can find is 9/16.

Which bikes came with 1/2" threaded pedal arms?

Re: BMX-size pedal arms?

Schwinn made cotter pin stuff back in the day. Not sure if that helps

Re: BMX-size pedal arms?

Hepatitis J [OFMC] /

Are you sure the 1/2" pedal arm isn't actually a derbi 14mm pedal arm? 14mm is about .55". If not, I have no clue sorry big dog.

Re: BMX-size pedal arms?

^ That would make sense. Cotter pin pedal arms were not that big in vintage BMX they would have been really heavy if it was. Most cheap pedal cranks were 1 piece for BMX in the 80s

Re: BMX-size pedal arms?

Anthony Walter /

Rather than swapping the pedal arms, I would suggest swapping the pedal axles, so you can keep the arms, but swap out the one pedal that is 1/2 to a 9/16 axle. I've done this before for swapping BMX pedals to work on mountain bikes. If you can't find any 9/16 pedals you want to extract the axle out of, or can't get anything on the internet, I've got a couple axles kicking around, prextracted. But do measure the length of the axle before you buy

Re: BMX-size pedal arms?

TOP GUN™ ANDY ⚔ (LSLB) ⚔ /

I think this is probably the winner!

Re: BMX-size pedal arms?

TOP GUN™ ANDY ⚔ (LSLB) ⚔ /

Treats had a derbi left pedal arm, so I'll give that a shot and report back

Re: BMX-size pedal arms?

I mean you can kinda run any cotterpin cranks, as long as theres enough offset to clear evry thing. I gotta a buncha pedal taps you can use if you wanna drill and tap to 9/16" - i'll just mail it to ya

Re: BMX-size pedal arms?

I got a box of cotter pin pedal arms from the bicycle Recyclery in town. They are all straight so I usually have to bend them.

Re: BMX-size pedal arms?

Yea, I mostly use old bicycle ones to weld the cut-off round end to moped ones for extra offset and pedal clearance.

Re: BMX-size pedal arms?

TOP GUN™ ANDY ⚔ (LSLB) ⚔ /

Why do people keep offering to help me get to 9/16"??? I WANT to run the idiot 1/2" pedals! They're SO DUMB

Re: BMX-size pedal arms?

cotter pin cranks are hands down the worst part about mopeds, no competition.

Re: BMX-size pedal arms?

> Dave & Bummerzz Wrote:

> -------------------------------------------------------

> cotter pin cranks are hands down the worst part about mopeds, no

> competition.

I concur

Re: BMX-size pedal arms?

I thought most bicycle cotter pin pedal arms are 1/2? I could be way off?

Re: BMX-size pedal arms?

What about a helicoil to make it half inch?

Re: BMX-size pedal arms?

I had a set of stripped moped arm that someone put the left pedal in the right arm and the right pedal in the left arm, I cut that section off and welded the threaded pedal end from a 1 piece bmx crank to use a set of 1/2” bmx pedals I had.

Re: BMX-size pedal arms?

TOP GUN™ ANDY ⚔ (LSLB) ⚔ /

> Dave & Bummerzz Wrote:

> -------------------------------------------------------

> cotter pin cranks are hands down the worst part about mopeds, no

> competition.

Square taper bottom bracket for mopeds WHEN

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