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Old 03-08-10, 04:44 PM   #1
Airburst
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one-piece cranks and clipless pedals

Are there any clipless pedals at all that fit the 1/2" thread in one piece cranks? I've been looking, but I can't seem to find any.
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Old 03-08-10, 05:17 PM   #2
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http://www.sheldonbrown.com/harris/pedals.html
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Old 03-08-10, 06:11 PM   #3
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More specifically, the adapter at the top of the page that takes 1/2" to 9/16"
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Old 03-08-10, 06:28 PM   #4
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I'd be worried about the increased Q factor with those pedal adapters, but aside from drilling and tapping for 9/16 (by a machine shop and probably not cheap) that's pretty much the only option.

Have you considered trying toe clips?

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Old 03-08-10, 07:33 PM   #5
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I would not worry too much about "the Q factor". If you are a top level competitor and need pedal adapters -- then you may have a problem. If you are a casual/beginner/youth/occational rider that wants his comfortable riding shoes to work on his 1 piece crank -- then get the adapters. You will not hurt anything or lose vast amounts of power.
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Old 03-08-10, 09:08 PM   #6
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I'd be worried about the increased Q factor with those pedal adapters, but aside from drilling and tapping for 9/16 (by a machine shop and probably not cheap) that's pretty much the only option.

Have you considered trying toe clips?
Most bikes with one piece cranks aren't really going to benefit from having clipless pedals put on. If you're going to go that route...
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Old 03-08-10, 09:16 PM   #7
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I, too, would prefer a different bike, but I couldn't say there's absolutely no benefit to clipless.

Airburst, you might be able to make some by taking the spindles from 1/2" pedal and putting them into clipless pedals. There's no telling which spindles would work.
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Old 03-08-10, 09:26 PM   #8
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I'd be worried about the increased Q factor with those pedal adapters, but aside from drilling and tapping for 9/16 (by a machine shop and probably not cheap) that's pretty much the only option.

Have you considered trying toe clips?
I think the toe clips and straps would make more sense.

Another option would be to take the clipless pedals to a machine shop and have the threaded spindles re-threaded to 1/2 inch. But if you do that take the cranks with you so that the shop knows exactly what you want. A good set of shoes to go with the clipless pedals will add a lot to the costs. With clips and straps you could wear just about any kind of shoe.
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Old 03-08-10, 09:27 PM   #9
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I think the toe clips would make more sense.
Another option would be to take the clipless pedals to a machine shop and have the threaded spindles re-threaded to 1/2 inch. But if you do that take the cranks with you so that the shop knows exactly what you want.
*seriously*

What kind of bike with one piece cranks is this actually worth doing for?
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Old 03-08-10, 09:28 PM   #10
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For the love of god, don't sully a pair of clipless pedals with a one-piece crank... it's just... wrong, somehow.

/shudders
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Old 03-09-10, 04:12 PM   #11
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*seriously*

What kind of bike with one piece cranks is this actually worth doing for?
That's up to the OP, who just wanted to hear what the options were.
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Old 03-09-10, 04:15 PM   #12
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Most of the department store platform pedals now come with those 9/16 to 1/2 adapters. They are $6 or so in the US. It's probably your cheapest option.
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Old 03-09-10, 05:41 PM   #13
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Rather than Jury rig something together, would it be possible to go with a new, inexpensive two or three piece crankset with a new bottom bracket?
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Old 03-09-10, 05:56 PM   #14
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Yes, and it would reduce weight by a lot. It would be quite costly, though. What kind of bike is it, anyway?
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Old 03-09-10, 08:29 PM   #15
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I put a pair if 1/2" pedals on my 3-speed PUCH - and installed toe-clips/straps. Works great. But I wouldn't even think to consider clipless. Whatever yanks your crank.
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Old 03-09-10, 08:36 PM   #16
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How about tubular tires?
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Old 03-09-10, 08:45 PM   #17
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Stretch em over 27" rims FTW : p
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Old 03-09-10, 09:46 PM   #18
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Most of the department store platform pedals now come with those 9/16 to 1/2 adapters. They are $6 or so in the US. It's probably your cheapest option.
I'd like to see these. I have a hard time believing a $45 piece of machined steel can be replaced by something that costs $6 at a department store. I have a hard time believing that a department store would even consider carrying at item that's very rarely carried at very eclectic albeit knowledgable bike shops.

You do understand that we're trying to put a 9/16" thread pedal into a 1/2" thread crank, don't you?

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Old 03-09-10, 09:51 PM   #19
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Are there any clipless pedals at all that fit the 1/2" thread in one piece cranks? I've been looking, but I can't seem to find any.
Years ago I thought I saw a Wellgo pedal with an add-on clipless thingy. The pedals were available with 1/2" thread, so it might have been possible. Now, I don't think so. The Kneesaver gadgets or switching to 3-piece cranks are probably the only way to make this happen now.
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Old 03-09-10, 11:00 PM   #20
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The $6 department store doodads go the other way, up to 9/16 from 1/2.

Another alternative is Powergrips; installed correctly, the foot retention/release is the same motion as a clipless. That's how I got familiar with clipless to start with.

There are also BMX wanna-be's available though the big-boxes that come with square-taper cranks; the LBS can order them, too. United Bicycle Supply carried them, last I knew -- used to have their catalog, as we were recognized as a bike retailer (W-M).
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Old 03-10-10, 01:57 AM   #21
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The 1-piece cranks with 9/16"are still available. Bikeworldusa list them instock. Debbie runs the place, call her to double check.
http://www.bikeworldusa.com/product_...oducts_id/1665

The alternative route would be to put in a BB conversion kit. There are two different styles
First w/bearing setup similar to a one piece crank
http://www.bikeworldusa.com/product_...roducts_id/942

or a set of threaded BB adapters
http://www.bikeworldusa.com/product_...oducts_id/1037

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Old 03-10-10, 02:11 AM   #22
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Are there any clipless pedals at all that fit the 1/2" thread in one piece cranks? I've been looking, but I can't seem to find any.
There were some very rare bmx 1/2 clipless pedals made long ago, I picked up a pair once but have never seen another in several years.

In addition to the adapter mentioned, I have wondered about taking a platform from a 9/16 set, and assembling that clamp on a 1/2 pedal.
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Old 03-10-10, 02:13 AM   #23
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Most of the department store platform pedals now come with those 9/16 to 1/2 adapters. They are $6 or so in the US. It's probably your cheapest option.
Problem is those are 1/2 pedals with adapter to fit 9/16 cranks, the OP needs the opposite. The adapters on Harris' site is the direction he needs.
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Old 03-10-10, 02:15 AM   #24
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*seriously*

What kind of bike with one piece cranks is this actually worth doing for?
There are high end bmx 1 piece cranks out there.
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Old 03-15-10, 10:01 AM   #25
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The $6 department store doodads go the other way, up to 9/16 from 1/2.

Another alternative is Powergrips; installed correctly, the foot retention/release is the same motion as a clipless. That's how I got familiar with clipless to start with.

There are also BMX wanna-be's available though the big-boxes that come with square-taper cranks; the LBS can order them, too. United Bicycle Supply carried them, last I knew -- used to have their catalog, as we were recognized as a bike retailer (W-M).
Here they have both sets. They have a set with the 9/16 threads and 1/2 adapters, or a set with 1/2 threads and 9/16 adapters. Both are $5.99. Pretty clumsy, but they work.
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