Re-thread question

[Abbynorml]

I was wondering if I can re-tap my 1/2" Schwinn 1 piece crank for 9/16" pedals?

Thanks in advance for any input!

 

[Wildcat]

I think the walls would be too thin to handle the stress of pedaling.

 

[Harvie]

better off getting the adaptors 9/16 to 1/2

 

[Abbynorml]

Hey thanks for the interest in helping me, I called my lbs and they said they have done it before, they give the crank to a machine shop. he said it works fine. so now I'm thinking I can do it by buying the taps of eBay, they are the same price as the adapters and I can do it more than one bike, and I don't have extended pedals.

 

[deorman]

Another option is to get a 3-pc adapter crank.
http://www.porkchopbmx.com/YST-square-t ... -22147.htm
http://www.bikeworldusa.com/index.php/c ... 207260aae4
http://rinienterprises.com/ Item Number # BOT22147JB

 

[Abbynorml]

I have thought about it before, but i thought it was expensive. I have little experience with that and thought the re-tap would be easier and less money and headache in case I bought everything wrong and nothing fit.

 

[jerrykr]

you will also need to drill the hole out with the correct drill size first, and then tap the new hole.

I suggest that you use a drill press and a vice to hold the crank. The hole must be straight.

If you drill it by hand, you will probably "hog" the hole out and ruin the crank.

obvious question: why did the LBS send the cranks out to a machine shop? See above.

 

[deorman]

you will also need to drill the hole out with the correct drill size first, and then tap the new hole.

I suggest that you use a drill press and a vice to hold the crank. The hole must be straight.

If you drill it by hand, you will probably "hog" the hole out and ruin the crank.

obvious question: why did the LBS send the cranks out to a machine shop? See above.

Another option is to get a 3-pc adapter crank.
http://www.porkchopbmx.com/YST-square-t ... -22147.htm
http://www.bikeworldusa.com/index.php/c ... 207260aae4
http://rinienterprises.com/ Item Number # BOT22147JB
See above.

 

[deorman]

Or just get some better 1/2" pedals. They're out there. :|

 

[axsepul]

Or just get some better 1/2" pedals. They're out there. :|

Best idea so far deorman!

Or just get a new crank

 

[user 135]

Rethreading would be an unwise idea. Not enough metal. It may work until you put your full weight on the pedal. That would hurt.

http://www.cyclebanter.com/showthread.php?t=125083

They used to make a one piece crank with 9/16" threaded holes, but they can be hard to find.
http://sheldonbrown.com/harris/opc.html#opc

 

[axsepul]

The new walmart cruiser bikes (schwinn, huffy and others) have a one piece crank that's a 9/16. Love the pedals they are using on them new schwinn. They really hold my 270 + weight!

 

[Abbynorml]

Does anyone know if the newer Schwinn's with a one piece crank with 9/16 pedals fit or work with a 1961 middle weight frame? Can they be swapped straight across or do I have find other size crank bearings? I really don't have much if any experience removing or taking a crank out of a bike, don't get me wrong I'm pretty good with my hands! But I have not done it before. I have had newer mountain bikes that i would take to my local bike shop for that type of repairs...

 

[axsepul]

I have install those new cranks on pre war bikes. I think it will work for you. The fork head set is another story. They tend to be different specially if the new schwinn frame is aluminum.