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1/2'' and 9/16'' pedals

Old 07-15-09, 04:01 PM
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1/2'' and 9/16'' pedals

is it typically road- 1/2'' and mtb 9/16''?..........
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Old 07-15-09, 04:04 PM
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No. 9/16" for road and mountain, as well as quality bmx. 1/2" for low-end bmx and kids bikes
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Old 07-15-09, 04:08 PM
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Nope. One piece Ashtabula cranks as found on BMX and cruisers are 1/2" typically while 9/16" pedals are standard on about everything else including both road and MTB bikes. Older French bikes used a third pedal thread size.
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Old 07-15-09, 04:09 PM
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is grease completely nessasary when installing pedals?
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Old 07-15-09, 04:20 PM
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Originally Posted by RonaldHaines100 View Post
is grease completely nessasary when installing pedals?
No. But I wouldn't install them without it.
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Old 07-15-09, 04:43 PM
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I stripped two crank arms in one day. I tightened them up all the way, Im not sure what did it.
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Old 07-15-09, 05:29 PM
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Originally Posted by RonaldHaines100 View Post
is grease completely nessasary when installing pedals?
Makes it easier to remove the pedals years later.
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Old 07-15-09, 05:30 PM
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My new/old PUCH 3-spd. takes 1/2" pedals. I picked up a new pair of Pyramid pedals and slapped on some MKS toe-clips. Rides great! And the Pyramid's are serviceable - I won't buy a pedal I can't open.

Oh yes - I greased 'em up good before installing them. I recommend Finish Line Teflon grease as it won't break-down over many years. Who knows when I'll need to take 'em off for cleaning/overhauling?
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Old 07-15-09, 07:32 PM
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Originally Posted by RonaldHaines100 View Post
is grease completely nessasary when installing pedals?
No, but you could drive yourself crazy if you don't grease the pedal threads. I once spent 3 consecutive weekends overhauling my bottom bracket, trying to track down a squeak. I took apart everything- crankarms, chainrings, bottom bracket cups. I eventually got around to taking the pedals off- the threads were kind of dry, so I cleaned them, greased them, and put the pedals back on. Squeak gone.

IMO, no threaded interface should go unlubricated. It's too easy to do, and it always has good effects.
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Old 07-15-09, 07:40 PM
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Originally Posted by Jeff Wills View Post
IMO, no threaded interface should go unlubricated. It's too easy to do, and it always has good effects.
These are absolute words of wisdom, young grasshopper. Listen and learn.
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Old 07-15-09, 07:42 PM
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Originally Posted by RonaldHaines100 View Post
I stripped two crank arms in one day. I tightened them up all the way, Im not sure what did it.
Considering the tremendous (and unnecessary) torque some shop mechanics use when installing pedals without ruining the threads, either you REALLY tightened them to excess or you managed to cross thread them.

Grease isn't essential to install pedals but it does assure they won't creak and can make later removal much less of a hassle.
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Old 07-15-09, 08:36 PM
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List all reasons how I could have stripped my crank arm.
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Old 07-15-09, 08:43 PM
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Originally Posted by RonaldHaines100 View Post
List all reasons how I could have stripped my crank arm.
Crossthreading. (#1 with a bullet!)
Pedal threaded 1/2 way in, then ridden. (Usually in combination with crossthreading.)
Mismachined threads, particularly with cheap parts. (Oversize crankarm hole, undersize pedal axle.)
Left pedal put in right crankarm and vice-versa. (Seen it happen.)
French threaded pedals in English threaded crankarm. (On parts 30+ years old.)
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Old 07-15-09, 09:55 PM
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Originally Posted by mackerel View Post
Makes it easier to remove the pedals years later.
In addition to greasing the threads, I also take the pedal off about twice a year, just to exercise those threads. Years ago, I had one pedal that took plenty of creativity, application of physics and cussing just to remove.
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Old 07-15-09, 10:01 PM
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You never install pedals without grease. Ever.
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Old 07-16-09, 06:37 PM
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One piece cranks use 1/2" pedal spindles.
Cotterless cranks use 9/16" pedal spindles.
Always use grease.
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Old 07-16-09, 07:18 PM
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Originally Posted by RonaldHaines100 View Post
is grease completely nessasary when installing pedals?
I use anti-seize compound;
(The goop that looks like a mix of aluminum powder in a heavy oil.)
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Old 07-16-09, 07:43 PM
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Originally Posted by Shimagnolo View Post
I use anti-seize compound;
(The goop that looks like a mix of aluminum powder in a heavy oil.)
Or Ni powder or Cu powder. For this application it accomplishes the same thing as grease.

I also remove pedals at least once a year, clean the threads and grease them before reinstalling. Same reasoning as removing and greasing seatposts and stems at least annually.
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Old 07-17-09, 08:56 AM
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Originally Posted by RonaldHaines100 View Post
is grease completely nessasary when installing pedals?
Only if you want to be able to remove them at some point.
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Old 07-17-09, 10:31 AM
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I usually blow them out with Tri-Flow before greasing. When you unscrew pedals, they often pull in road crud with them.
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Old 07-17-09, 12:46 PM
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Fun Fact: Ashtabula Cranks, AKA one piece cranks, are 1/2". They are named after the city outside Detroit where they were first produced.
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Old 07-17-09, 12:53 PM
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Originally Posted by nahh View Post
Fun Fact: Ashtabula Cranks, AKA one piece cranks, are 1/2". They are named after the city outside Detroit where they were first produced.
Ashtabula's actually in extreme northern Ohio, just north of Toledo and south of the Michigan border
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Old 07-17-09, 02:55 PM
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Originally Posted by moxfyre View Post
Ashtabula's actually in extreme northern Ohio, just north of Toledo and south of the Michigan border
nice! I learn something new everyday.
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Old 07-17-09, 03:00 PM
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Originally Posted by nahh View Post
nice! I learn something new everyday.
Glad to be of service. I'm a veritable fount of useless knowledge today
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