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Old 07-23-07, 08:34 AM   #1
zoeglassjd
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Would you tap that...

Ok, so I have two stripped crank arms that I am interested in tapping and reusing.

The problem is this scares me. I see the park tap tool set and it seems simple enough, but is it simple enough?

Cambria has the tap set for $30.

I could throw a couple extra bucks in and get a whole new crankset on the cheap (the one I am repairing is old anyway).

Also, is the 1/2"-20TPI the right size for your standard pedal (think: spd)?

thanks for any help, tips, advice etc.
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Old 07-23-07, 08:43 AM   #2
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Heck, I would just a new crankset. I mean, unless you had some super rare or super expensive crank, then I would think about it. But if your attitude is that for a "couple extra bucks" you could get a new one, personally, I wouldn't even bother. But hey...that's only me and my opinion. It's not terribly hard to fix one, but will you really use the tap more than....oh....once? At least with a new set of cranks, they'll be good for years.
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Old 07-23-07, 08:46 AM   #3
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yep, leaning in that direction. Unless... I can borrow a set of taps from a friend who is MIA right now. In that case you make it sound like it isn't a hard process.

Thanks.
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Old 07-23-07, 08:49 AM   #4
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If the crank is indeed stripped, the taps by themselves won't do any good. Stripping means that the metal that formed the threads is gone. To fix them you would need a repair kit to drill out and tap the old hole to a larger size, then install an insert. That kit is closer to $100.

All pedals use the same mounting thread.
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Old 07-23-07, 08:55 AM   #5
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thanks DMF. So, here's the rest of the story:

zgjd loaned bike to friend. friend put on platforms. friend replaces platforms with spd pedals. friend gives bike back to zgjd. zgjd pedals bike. pedal rips from crankarm. now zgjd thinks it is more stripped than damaged. friend does not return emails.

Looks like a new crankset is appropriate. It a rough decision as this is my around town grocery getter/commuter. Not sure how much I want to put into her.

zgjd
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Old 07-23-07, 09:31 AM   #6
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for the record....

I view these as the "I'm only ever gonna' use it ONCE" type tool purchases.

If it were me, and I wanted to keep the crankset, I'd pay the LBS (or a local machine shop) to do it.
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Old 07-23-07, 10:49 AM   #7
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You can sometimes buy just one crank arm, not quite half price, but cheaper than a whole set.
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Old 07-23-07, 11:01 AM   #8
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Typical 3 piece cranks use a 9/16" pedal thread.
Typical 1 piece use 1/2".
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Old 07-23-07, 11:02 AM   #9
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One-piece cranks should be against the law.
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Old 07-23-07, 11:53 AM   #10
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I had a LBS put in a helicoil in a stripped crank for $15.
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Old 07-23-07, 12:59 PM   #11
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Quote:
Originally Posted by mparker326 View Post
I had a LBS put in a helicoil in a stripped crank for $15.
and THAT's what I'm talkin' about.

Incidentally, why hasn't anybody applauded the OP for his thread title? Rather cute, I'd say
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Old 07-23-07, 09:57 PM   #12
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Quote:
Originally Posted by zoeglassjd View Post
Ok, so I have two stripped crank arms that I am interested in tapping and reusing.

The problem is this scares me. I see the park tap tool set and it seems simple enough, but is it simple enough?

Cambria has the tap set for $30.

I could throw a couple extra bucks in and get a whole new crankset on the cheap (the one I am repairing is old anyway).

Also, is the 1/2"-20TPI the right size for your standard pedal (think: spd)?

thanks for any help, tips, advice etc.
9/16" 20tpi. you are better off just paying the bike shop to do it. It will probably have to be helicoiled. I have run a tap though buggered threads on crank arms, but its rare and usually a once in 2-3 months sorta deal. You would be wasting your money buying taps.
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Old 07-23-07, 10:03 PM   #13
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I'd hit that. Best thread ever.
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Old 07-23-07, 10:04 PM   #14
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Quote:
Originally Posted by neil0502 View Post

Incidentally, why hasn't anybody applauded the OP for his thread title? Rather cute, I'd say
Gotta get attention somehow...

Thanks all.
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Old 07-23-07, 10:23 PM   #15
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Gotta get attention somehow...

Thanks all.
Credit please.
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Old 07-24-07, 09:05 AM   #16
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Credit please.
You got it.
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Old 07-24-07, 09:23 AM   #17
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Quote:
Originally Posted by zoeglassjd View Post
zgjd loaned bike to friend. friend put on platforms. friend replaces platforms with spd pedals. friend gives bike back to zgjd. zgjd pedals bike. pedal rips from crankarm. now zgjd thinks it is more stripped than damaged. friend does not return emails.
Some friend....unless you plan to tap the "friend".

Never loan out your bikes unless you don't care about it.
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